Dollar7e8 engine code - If your car’s dash displays a 7EB code, it implies that an issue with the car’s diagnostic control module has been found. This isn’t similar to a regular check engine light, which indicates that the engine has an issue. Also, remember it’s different from the 7ea engine code. This code is usually generated when there is an issue with the ...

 
Mar 26, 2013 · GMCustomerService · #10 · Sep 4, 2013. toddparrino said: I have a 2012 3500. A few months ago the check engine light came on. When I took it to get looked at on my local auto hobby shop, I received three codes from the shop. The codes are $7E8, $7EA, and $7EE. . Interstelar 2 operation terra 2040

The $7E8 code typically refers to the engine, while the $7E9 code refers to the transmission. These are CAN codes so you have a PCM or BCM that is not working but I have seen these cars needing a TIPM which is easy to replace because it self initializes.Jan 22, 2023 · Diagnosing the 7E8 Code. If the 7E8 Code appears on your car’s diagnostic system, the first step is to clear the Check Engine light or use a scanner to reset the CE. This may resolve the issue, and the Code will not reappear. Repairing the 7E8 Code. Suppose this Code appears after clearing the Check Engine light or resetting the CE. The code is a menu of systems that the OBDII scanner can access. OBDII scanner interprets the code and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemCheck engine light - Remember that the 7E8 code is related to the engine powertrain. The check engine light will light up on the dashboard when the engine has an issue. The 7E8 code will be stored whenever the engine has a problem, and the CEL will illuminate. Poor engine performance - Your vehicle will have a hard time going uphill, especially ...F. FreeWillie · #2 · Mar 29, 2012. Those are factory codes for options installed by the factory computer inventory "pick" system. They are meaningless for your check engine light. Reset the light. And watch for another light. You may have had a momentary "glitch" that cleared itself but lasted long enough to trigger the CEL.I recently had the OBD port scanned and, lo and behold, three control module codes came up: $7EB, $7EA and $7E8. The dealership insists that this is perfectly normal and is refusing to diagnose it even though my car is still covered under the one-year bumper to bumper warranty. They say its not a problem unless the check engine light comes on.How do i get the codes and what they mean for a 04. Go to your local autozone or advance auto. They will scan the codes for you. Write down the codes, then google them. The OBD-II codes are based on a universal chart, with only a few exceptions. You can also post back here, and someone here will teach you what each code you encounter means, and ...Mar 29, 2012 · F. FreeWillie · #2 · Mar 29, 2012. Those are factory codes for options installed by the factory computer inventory "pick" system. They are meaningless for your check engine light. Reset the light. And watch for another light. You may have had a momentary "glitch" that cleared itself but lasted long enough to trigger the CEL. How do i get the codes and what they mean for a 04. Go to your local autozone or advance auto. They will scan the codes for you. Write down the codes, then google them. The OBD-II codes are based on a universal chart, with only a few exceptions. You can also post back here, and someone here will teach you what each code you encounter means, and ...Found this on a Google search. p2098 $07E8 Post catalyst fuel trim system too lean bank 2. p2272 $07E8 o2 sensor signal stuck lean bank 2 sensor 2. Probably best to rescan yours with a specific BMW code reader such as INPA or a Creator 310+ handheld scanner that will have a better explanation of the codes. The code you have points to too much ...What does BMW fault codes $7E8:Engine mean ? Whats about BMW fault code $7EC ? Its a 2008 328i base sedan. It idled a little rough last night. This morning it started rough, ran for about three minutes and shut off. I plugged a Cen-Tech brand reader in and those codes appeared.You can fix this engine code by repairing faults or malfunctions in the transmission system. Engine code 7EA. The OBD scan tool will display this engine code when it needs more information about the engine control unit 3. You can fix this engine code by scanning ECU #3 and fixing faults. Engine code 7EBSep 24, 2013 · Mopar Certified. Dodge Technician. Vocational, Technical or Tra... 8,409 satisfied customers. 2012 dodge charger srt8 threw codes 7e8 and 7e9 after dealer. 2012 dodge charger srt8 threw codes 7e8 and 7e9 after dealer performed a oil change and brake service. … read more. Hi. I think you bought a new scan tool. No Problem. 7E8 and 7E9 are subcategories for the engine and transmission. Scroll down some more. OBD2 engine codes will always start with "P". Example: P0300- Random misfire. Good Luck.The 7E8 engine code related to the Emission Control System of Hyundai cars can be because of a busted fuse, too. This could be due to numerous reasons, such as an electrical short-circuit or high voltage spike. A visual inspection of the fuses should be done first before running any tests with diagnostic tools.Aug 27, 2018 · I have a 2007 CHevy Impala 3.5 lt engine. The engine light came on and we checked the codes and the code came up $7E8 and $7EA. we believe these are generic codes and the $ could be optional. 7E8, 7EA. Cat failure. - Check the health of catalytic converter. - Check for cracks in muffler. - Check air leaks. May 8, 2020 · I have a 2010 chevy silverodo that displayes three codes ($7EA, $7E8 and $7EB) I cleared the codes and the light stays off untill I use the remote start. then the engine starts and quits after about 3 … read more The engine light came on and we checked the codes and the code came up $7E8 and $7EA. we believe these are generic codes and the $ could be optional. 7E8, 7EA. Cat failure. - Check the health of catalytic converter. - Check for cracks in muffler. - Check air leaks.Oct 29, 2017 · The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System The first and foremost thing that you need to do to fix the 7e8 engine code is to find the DLC, i.e., the Data Link Connector. The location of DLC will vary based on the model of Chevy that you are using. Connect the code scanner tool to the DLC port: Secondly, connect the code scanner tool with the DLC port of your Chevy.The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemFound this on a Google search. p2098 $07E8 Post catalyst fuel trim system too lean bank 2. p2272 $07E8 o2 sensor signal stuck lean bank 2 sensor 2. Probably best to rescan yours with a specific BMW code reader such as INPA or a Creator 310+ handheld scanner that will have a better explanation of the codes. The code you have points to too much ...Aug 7, 2018 · The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System Jul 30, 2023 · Error code $7e8 is a diagnostic trouble code that indicates air or fuel intake into the engine control system, thereby leading to a loss of air pressure in your vehicle’s evaporative emission control system. Recommended: P1122 Code - Throttle Position Sensor Circuit Intermittent Low Voltage Jun 11, 2018 · The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System Mopar Certified. Dodge Technician. Vocational, Technical or Tra... 8,409 satisfied customers. 2012 dodge charger srt8 threw codes 7e8 and 7e9 after dealer. 2012 dodge charger srt8 threw codes 7e8 and 7e9 after dealer performed a oil change and brake service. … read more.Jan 22, 2023 · Diagnosing the 7E8 Code. If the 7E8 Code appears on your car’s diagnostic system, the first step is to clear the Check Engine light or use a scanner to reset the CE. This may resolve the issue, and the Code will not reappear. Repairing the 7E8 Code. Suppose this Code appears after clearing the Check Engine light or resetting the CE. I have a 2010 chevy silverodo that displayes three codes ($7EA, $7E8 and $7EB) I cleared the codes and the light stays off untill I use the remote start. then the engine starts and quits after about 3 … read moreWhat those these codes mean 07E8 07E9. 07E8: codes were requested from your vehicle's engine module. 07E9: codes were requested from your vehicle's transmission module. You should be able to click on those codes if you're using a capable scan tool, and you'll see which powertrain (PXXXX) codes are stored. Oct 18, 2022 • Ford Cars & Trucks.The 7ea engine code chevy silverado isn’t actually a malfunction code. This 7ea trouble code will be shown when the OBD scanner requires additional input, for example, information about the kind of elements being examined.Apr 25, 2013 · $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. May 19, 2020 · What does BMW fault codes $7E8:Engine mean ? Whats about BMW fault code $7EC ? Its a 2008 328i base sedan. It idled a little rough last night. This morning it started rough, ran for about three minute … read more The code 7E8 means that Your Chevy is facing fuel or air intake issues. In case You see this code in Your car, You should take it to a reliable auto repair shop to get the problem properly diagnosed. The diagnosis will determine the root cause of the issues in the fuel or air intake. Air or fuel intake issues mean that the car is not performing ...The 7E8 engine code related to the Emission Control System of Hyundai cars can be because of a busted fuse, too. This could be due to numerous reasons, such as an electrical short-circuit or high voltage spike. A visual inspection of the fuses should be done first before running any tests with diagnostic tools.The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemIn this case, $7 represents mode 7, which basically means diagnostic code request. E8 (or E9) indicates that you request fault codes from module E8 (or E9). In conclusion: $7E8: request codes from the engine module. $7E9: request codes from the transmission module.The code is a menu of systems that the OBDII scanner can access. OBDII scanner interprets the code and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemYour $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Codes $7E8, $7E9 and P1326? - CarGurus.caIn this case, $7 represents mode 7, which basically means diagnostic code request. E8 (or E9) indicates that you request fault codes from module E8 (or E9). In conclusion: $7E8: request codes from the engine module. $7E9: request codes from the transmission module. 1. Remove the Mass Air Flow (MAF) housing, inspect the area near the screen. If flashing is noted, remove it. Refer to the latest version GM bulletin PIP4683.Dec 16, 2019 · My son is having code $7E8 and $7E9 on his 2012 Volkswagen Jetta. He uses it for collage but it has issues constantly and he has had it in the shop four times in the last year. $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module.Jul 30, 2020 · Repair costs associated with replacing a bad MAF sensor, average $230-280 in parts and labor, while a damaged oil pan can run anywhere from $570-630 in parts and labor. To properly diagnose the 7E8 code, visit a reliable service center. Feb 17, 2014 · 7E8 ENGINE CODE - Hyundai Cars & Trucks question. $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Feb 27, 2019 · $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Apr 3, 2014 · 7e8 engine code. $7E8 ENGINE. Posted by Anonymous on Apr 03, 2014. 1 Answer. Posted on Apr 27, 2012. Sep 1, 2014 · The engine light came on and we checked the codes and the code came up $7E8 and $7EA. we believe these are generic codes and the $ could be optional. 7E8, 7EA. Cat failure. - Check the health of catalytic converter. - Check for cracks in muffler. - Check air leaks. Think car OBD2 Scanner Code Reader for Car – $130.44 to $154.90. ABS/ SRS and Engine complete OBD reader with Wi-Fi update and 28-reset. Read and erase any faulty codes easily, and it works on more than 1000+ car makes. It comes with a big five inches touch screen and Android 7.0, which makes it portable.Feb 17, 2014 · 7E8 ENGINE CODE - Hyundai Cars & Trucks question. $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Check engine light is on, three codes listed $7EB, $7E8, and $7EA. On steady. No blinking. 2010 Camaro SS, Plugged in - Answered by a verified Chevy MechanicOct 1, 2018 · The code is a menu of systems that the OBDII scanner can access. OBDII scanner interprets the code and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System My 2014 is showing these same codes. “Engine” and “transmission” are not very specific. Can’t seem to find any more information. Nov 9, 2020 #3Feb 17, 2014 · 7E8 ENGINE CODE - Hyundai Cars & Trucks question. $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Different scan tool display engine powertrain , transmission powertrain and ABS system. These 3 control modules for the scan tool to read. the fault codes will be in the engine control module, but the 7E8 is letting you know there are codes, you need to select the engine control module to read the codes. same for 7E9Understanding the 7E8 code. The 7E8 engine code is a generic code indicating an issue with the engine control module ( ECM ). It is not specific to a single problem; rather, it signifies that the ECM has detected an irregularity within the engine’s operation. To narrow down the issue, further diagnosis is necessary.Jan 17, 2023 · A faulty Purge Control Solenoid Valve fails to respond to the control signals, which the system detects as a problem. The control module then activates the 7e8 engine code to alert the driver about the issue. 06. Faulty Seal of the Fuel Pump. The fuel pump seal or gasket prevents the fuel oil leakage onto the cam case. 0 answers. CODE:801C20 ZGM. central faulty memory.2-D36D54SIGNEL 3-4809AB undervoltage. Please help me fix this problem BMW125I M Sport 2013. Be the first to answer Feb 17, 2022 • BMW Cars & Trucks. 0 answers.Mar 26, 2013 · GMCustomerService · #10 · Sep 4, 2013. toddparrino said: I have a 2012 3500. A few months ago the check engine light came on. When I took it to get looked at on my local auto hobby shop, I received three codes from the shop. The codes are $7E8, $7EA, and $7EE. I have a 2007 CHevy Impala 3.5 lt engine. The engine light came on and we checked the codes and the code came up $7E8 and $7EA. we believe these are generic codes and the $ could be optional. 7E8, 7EA. Cat failure. - Check the health of catalytic converter. - Check for cracks in muffler. - Check air leaks.Your $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Codes $7E8, $7E9 and P1326? - CarGurus.caThe codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemHow do i get the codes and what they mean for a 04. Go to your local autozone or advance auto. They will scan the codes for you. Write down the codes, then google them. The OBD-II codes are based on a universal chart, with only a few exceptions. You can also post back here, and someone here will teach you what each code you encounter means, and ... The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System0 answers. CODE:801C20 ZGM. central faulty memory.2-D36D54SIGNEL 3-4809AB undervoltage. Please help me fix this problem BMW125I M Sport 2013. Be the first to answer Feb 17, 2022 • BMW Cars & Trucks. 0 answers.Nov 11, 2020 · Joined Apr 21, 2014 Posts 1 Reaction score 0 Ram Year 2013 Engine 5.7L Sep 24, 2013 · Your $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Codes $7E8, $7E9 and P1326? - CarGurus.ca The code is a menu of systems that the OBDII scanner can access. OBDII scanner interprets the code and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemSo, I bought a 2008 Jeep Patriot Sport 2.4L CVT Transmission about a little over a month ago from a used dealer. So far, we've had to unclog the sunroof drains, replace thermostats, replace radiator, change spark plugs, do a transmission fluid exchange and filter change, oil change, change all the other filters, and about to replace the front and rear struts. Jul 8, 2013 · $7e8 code engine - Buick Enclave question. Battery drain on 04 park ave Battery is draining in hours and the alternator gets hot even when shut off. replaced the battery and had the alternator rebuilt making sure the shop replace the diodes and the regulator. put them back on and the same problem, if i remove the bat 1 fuse drain stops car runs but no dash lights , ac and other items don't ... What does BMW fault codes $7E8:Engine mean ? Whats about BMW fault code $7EC ? Its a 2008 328i base sedan. It idled a little rough last night. This morning it started rough, ran for about three minute … read moreDec 27, 2020 · Check engine light is on, three codes listed $7EB, $7E8, and $7EA. On steady. No blinking. 2010 Camaro SS, Plugged in - Answered by a verified Chevy Mechanic The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemMar 30, 2020 · The engine light came on and we checked the codes and the code came up $7E8 and $7EA. we believe these are generic codes and the $ could be optional. 7E8, 7EA. Cat failure. - Check the health of catalytic converter. - Check for cracks in muffler. - Check air leaks. Mechanics use these codes to identify what part of the engine is having issues. While some engine codes are fairly straightforward, others can be more difficult to decipher. The 7E8 and 7E9 engine codes represent an issue with the engine control and transmission management, respectively.A faulty Purge Control Solenoid Valve fails to respond to the control signals, which the system detects as a problem. The control module then activates the 7e8 engine code to alert the driver about the issue. 06. Faulty Seal of the Fuel Pump. The fuel pump seal or gasket prevents the fuel oil leakage onto the cam case.Hi. I think you bought a new scan tool. No Problem. 7E8 and 7E9 are subcategories for the engine and transmission. Scroll down some more. OBD2 engine codes will always start with "P". Example: P0300- Random misfire. Good Luck.The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine SystemApr 3, 2014 · 7e8 engine code. $7E8 ENGINE. Posted by Anonymous on Apr 03, 2014. 1 Answer. Posted on Apr 27, 2012. A faulty Purge Control Solenoid Valve fails to respond to the control signals, which the system detects as a problem. The control module then activates the 7e8 engine code to alert the driver about the issue. 06. Faulty Seal of the Fuel Pump. The fuel pump seal or gasket prevents the fuel oil leakage onto the cam case.

Code $7E8 NANCY BORUCKI HESTER MEMBER 2010 CHEVROLET HHR 94,000 MILES Check engine light sometimes comes on. Code reader says $7E8. I can’t find anyplace that can tell me what this is/what needs to be repaired. Had exhaust system checked and there is no problem there.. Christine d

dollar7e8 engine code

The engine codes displayed a guide to determining the real issue and applied effective solutions. However, faulty settings and sensors may also be mistaken, leading to poor diagnosis. With the correct diagnosis, either by an OBD or a professional, it should not be hard for your care to restore its functionality.Jun 11, 2018 · The codes are a menu of systems that the OBDII scanner can access. OBDII scanner interprets the codes and displays the menu. Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System Mar 26, 2013 · GMCustomerService · #10 · Sep 4, 2013. toddparrino said: I have a 2012 3500. A few months ago the check engine light came on. When I took it to get looked at on my local auto hobby shop, I received three codes from the shop. The codes are $7E8, $7EA, and $7EE. May 8, 2020 · I have a 2010 chevy silverodo that displayes three codes ($7EA, $7E8 and $7EB) I cleared the codes and the light stays off untill I use the remote start. then the engine starts and quits after about 3 … read more Your $7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. Codes $7E8, $7E9 and P1326? - CarGurus.caError code $7e8 is a diagnostic trouble code that indicates air or fuel intake into the engine control system, thereby leading to a loss of air pressure in your vehicle’s evaporative emission control system. Recommended: P1122 Code - Throttle Position Sensor Circuit Intermittent Low VoltageHad a new turbo installed 4000 miles ago, check engine light came on two weeks ago, bought a Foxwell code reader and it gave those two codes. This is a f350 7.6 diesel. read more3 Codes Control Module on the top then under it 7EB,7E8: Chevy Mechanic: Greg. Greg, Technician. Category: Chevy. Satisfied Customers: 10,419. Experience: 17 years Shop Owner /Technician. 27 years experience, Verified. This may take a little time, but rest assured, I am on the case, Ask Your Own Chevy Question.Some scanners can't solve these codes and show the codes instead of the interpretation. Clicking on the code menu will read the OBDII codes (e.g. P0420 or P0455), if any, from that system. Menu Code 7E8 ($7E8): Engine System. Menu Code 7E9 ($7E9): Transmission System. Menu Code 7EA ($7EA): Engine Management.The $7 at the start represents mode 7. The E8 and E9 represent different modules or parts of the vehicle from where the codes are retrieved. E8 represents the engine control module while E9 represents the transmission control module. In short: 7E8 means a request code from ECM. 7E9 means a request from TCM.Think car OBD2 Scanner Code Reader for Car – $130.44 to $154.90. ABS/ SRS and Engine complete OBD reader with Wi-Fi update and 28-reset. Read and erase any faulty codes easily, and it works on more than 1000+ car makes. It comes with a big five inches touch screen and Android 7.0, which makes it portable.$7E8 and the $7E9 are fuel/ air intake codes, as for the P1326 Ok, this code is set when the knock sensor detects vibrations from engine rod knock, however, it may be set falsely due to incorrect knock sensor logic programming in the engine control module. In this case, $7 represents mode 7, which basically means diagnostic code request. E8 (or E9) indicates that you request fault codes from module E8 (or E9). In conclusion: $7E8: request codes from the engine module. $7E9: request codes from the transmission module..

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