Last updated on October 1st, 2023 at 07:01 pm
The Jeep Engine Control Module, also known as the PCM (Powertrain Control Module), ECU (Electrical Control Unit), or simply the Automotive Engine Computer, plays a crucial role in the functioning of your vehicle. If you’re curious about the differences between these terms, we’ve covered them in detail in our previous post titled “Difference between ECM, ECU & PCM.”
To provide a brief summary, the ECM serves as the brain of your vehicle, controlling and coordinating various systems. Just like any other component, it’s important to periodically reset and test the ECM to ensure optimal performance and functionality.
Resetting your Jeep PCM involves a few straightforward steps that can be easily followed, allowing you to complete the process in no time at all. By following these steps, you can ensure that your Jeep’s ECM is in excellent working condition, allowing you to enjoy a smooth and problem-free driving experience.
Determine the Type of Jeep ECM
Before we dive into the reset process, it’s essential to understand that there are two types of [Jeep ECMs](); EEPROM (Electrically Erasable Programmable Read-Only Memory) and Flash. These terms refer to the type of memory used in your vehicle’s computer system. It’s important to determine which type of ECM you have in order to follow the correct reset procedure.
The Handy List:
- Estimated time required: Approximately 30 minutes.
- Gloves.
- Timer.
- Backup power source (in case of an old battery).
Warning: Ensure that your battery terminals do not touch or bridge. Safely place the terminals aside, away from any contact.
Instructions on How to Reset Your Jeep ECM
- Before proceeding, ensure that all components are turned off, including headlights, radio, AC/Heat, and sunroof if applicable. It is also crucial to make sure that the sunroof is closed properly to prevent any potential issues.
- Using a wrench or socket that fits, carefully disconnect the negative terminal from the battery. This step is important as it allows the system to reset completely. Leave the terminal unplugged for approximately 5-10 minutes to ensure that all residual power is drained from the system.
- After the designated time has passed, it is recommended to turn the headlights “on” and “off” twice. This action helps to fully drain any remaining power from the Engine Control Module (ECM), which is a vital component of your Jeep. By doing so, you ensure a thorough reset of the ECM.
- Finally, reconnect the negative terminal to the battery. Once this is done, your Jeep ECM should now be successfully reset, ready to function optimally.
By following these detailed steps, you can ensure a proper and effective reset of your Jeep’s ECM, resulting in smoother performance and improved functionality.
To wrap up, here are a few key points to remember. Resetting your Jeep’s ECM will not affect your vehicle’s mileage. It should not cause any issues with other modules, so feel free to reset it as many times as needed when diagnosing a problem with your car.
For good measure, keep in mind that after resetting your Jeep’s PCM, it’s recommended to drive your car for approximately 10-15 miles. This allows the Jeep ECM to re-learn your driving habits and optimize fuel management.
Best of luck with your reset, and don’t hesitate to share this valuable information with anyone who might find it helpful!
Thank you
It took about an hour to completely reset the ECM and drive for about 20 min. WOW it solved my steering problem. I would say that my steering now feels tighter. I drove at about 70mph that afternoon down the highway and it felt great. I typically was constantly correcting to keep the wrangler straight.
reset my ECM and found that the steering wheel took on a stiffer feel. The wrangler now needs less steering correction to stay in the lane and tracks much better .
Wait, What?……… ECM fixed your steering?
Would resetting the ECM possibly get my ac to start working again?
Jeep won’t turn over. Cluster Amp shows 9 amps with a charged battery
same issue on my 01 did you figure it out?
4.7 lt 2005 limited edition. The following all ceased to operate at the same time Drivers door and front passemger door, outside mirrors, keyless entry on drivers door only,
My 2008 Grand Cherokee would not turn over, dash lights and headlights and door locks all worked. I reset the ECM and it is now completely dead, no interior lights, no anything electrical. The battery is fully charged.
Anybody have an Idea ?
2004 Grand Laredo – 4.7 V8 . Had new battery fitted – no problems for a couple of days – then went to start engine – all warning lights came up as usual, but after 3 “dings ” on the audio warning , all lights except the Fuel Empty / seatbelt and SKIS lights went out – engine turned over no problem – but would not start . Over the next few days I tried numerous start ups – still nothing – but the last 2 days I have been able to start it with no problem – not game to drive it anywhere in case it decides to die on me . All the other electrics work – heater / air-con – headlights – indicators – electrical seat adjustment – all good . Any comments would be helpful.
My 2013 Jeep Grand Cheroke wont turn over. New battery, starter, alternator. Could it be the PCM