When did the speedometer and ECM get replaced?
The speedometer head has probably been replaced sometime in the past, either 587,000 miles ago with a new one, or sometime later with a used one, or the ECM could have been replaced with a high mile used one, but I would bet on the speedometer being replaced, and the ECM being correct..
What should I do if I need to replace my ECM?
If you need further assistance with replacing the ECM, then seek out a professional, such as one from Your Mechanic, to help you. The statements expressed above are only for informational purposes and should be independently verified.
How to reset the ECM on a light truck?
Light trucks & cars can be reset legally by filing paperwork with the DMV. There is always an in Craigslist for having this service performed on cars & light trucks. I called the guy doing it and he said he don’t have the equipment to do big trucks. All the trucks I’ve ever owned have had different ECM & speedometer mileage readings.
Can you tell me why the odometer and ECM numbers don?
I’ve never seen any truck where ECM miles perfectly matched odometer miles. Going by the GPS my odometer, before it quit working this past April, was spot on 100 miles driven when the GPS said I had 100 miles to go. For whatever reason the ECM would go 102 miles for every 100 GPS or odometer miles.
How to reset your ECM ( Engine Control Module )?
2- Disconnect the negative terminal from the battery using a wrench or a socket that fits, you should leave it unplugged for approximately 5-10 minutes. 3- Once the time has passed you should now turn the headlights “on” and “off” twice to drain the Engine Control Module from any remaining power.
What happens if I Reset my Jeep ECM?
To finish off this post , here are a couple of things you should keep in mind. Resetting your Jeep ECM will not have any effect on your vehicle’s mileage, Resetting it should not cause any issues between your other module so feel free to this as many time as you want if you’re trying to diagnose a problem with your car. For good measure.
What’s the difference between ECM and PCU in a jeep?
The Jeep Engine Control Module, known as the PCM ( Powertrain Control Module) ECU ( Electrical Control Unit ) or to simply it put the Automotive Engine Computer . Confusing right? If you would like to know more about their differences you can read up on our previous post ” Difference between ECM, ECU & PCM ” which we covered it in details.