Most Common Jeep Cherokee PCM Problems Make Me Crazy!

You may be wondering what a PCM is and why it’s important. The dang thing has been giving me problems for a while now!

Well, the acronym stands for “Powertrain Control Module”. The powertrain control module handles all of your Jeep Cherokee’s engine functions like fuel economy, torque, idle speed, etc. It also controls the transmission in some models to optimize fuel efficiency and performance while making sure that everything is operating properly.

To ensure optimal performance from your vehicle’s engine and transmission, make sure you have a professional check out any problems with your Jeep Cherokee PCM as soon as possible!

Common Cherokee PCM Problems, Most Common Jeep Cherokee PCM Problems Make Me Crazy!, Mad Digi

You can stop your search for answers here because we have all the answers you need! We know that this is a difficult situation to be in, and we’ll do whatever it takes to help you out. Let’s get started with fixing those Jeep Cherokee PCM Problems! The post goes on to solve the problems.

A PCM can fail due to a variety of factors, such as an electrical short circuit or corrosion. Problems may also occur if vibration causes micro-cracks in the unit. Determining why your Jeep’s specific PCM failed specifically is essential when replacing it so that you avoid any costly repairs and misdiagnosis from another mechanic who doesn’t know what caused the issue with your vehicle before taking over for service work on it

It Shows Random Error Codes

The PCM may display random error codes (also known as OBDII codes), even if nothing is wrong with your Jeep. There are a total of 5000 generic and manufacturer-exclusive OBDII codes programmed into Jeep vehicles.

But you would know that you have an issue with the powertrain, or engine part for Jeeps – not just Cherokee models but other models too -if your code scanner is reading P06 errors which signify problems in this area of performance; click here to find out what they mean!

The Engine Stalls Or Misfires

One function of the Jeep Cherokee PCM is to control fuel injection and determine when it’s time for a shift. If this device malfunctions, you might experience engine stalls or rough idling. Sadly; one of the most frustrating issues with your 1998 Grand Cherokee was thanks to its faulty PCM!

The Check Engine Light Comes On

Common Cherokee PCM Problems, Most Common Jeep Cherokee PCM Problems Make Me Crazy!, Mad DigiWhen your Check Engine light turns on, it could mean one of two things: the PCM is at fault or you have an emissions problem. The PCM has a lot to do with powering and controlling many aspects of your vehicle’s engine system such as fuel injection systems, ignition timing control for optimal combustion efficiency, decreased idling RPMs before shutting off the car when not needed, etc.

When this electrical gear fails to work properly due to some reasons like power surges during cold weather start-up which may affect several other components along its path including sensors and wiring near them then trouble starts creeping into driver seat through dashboard lights coming alive with warning messages about faulty parts that need fixing soon enough!

If you end up replacing your PCM and the Check Engine light comes back on after, don’t immediately assume that the replacement is faulty. Something else might be wrong with the vehicle that needs to be located, diagnosed, then repaired.

The Vehicle Has Difficulty Starting

Leaving your Check Engine light on can be troublesome as it’s a sign that the vehicle needs repair. If you experience issues with starting up, this may also indicate a problem in the PCM of 1994 Jeep Grand Cherokee vehicles which provide wrong input to car operations and result in various problems from faulty ignition or timing when an alternator is not at fault.

The Engine Has Performance Issues

As your Jeep’s PCM controls the air-to-fuel ratio and transmission, a faulty unit can decrease fuel efficiency, acceleration power, and mileage. A defective PCM may also cause sluggishness when suddenly accelerating or driving uphill.

You might also experience performance issues with other parts like electrical problems from time to time as well if you don’t have a good system in place for diagnosing what caused the problem early on.

There Is Damage To The Circuit Board

Corrosion, shorts, and loose connections can all contribute to PCM issues. One specific issue that owners reported was problems with the electrical system in 2000 Jeep Grand Cherokees. To fix this problem you need a soldering repair which requires considerable skill because of poor solder on the 5V power connection for these vehicles.

There Are Transmission Issues

You may have a faulty PCM if your Jeep is shifting erratically. Or, you could be experiencing problems because it seems like the transmission can’t decide when to shift gears and goes from one gear to another without warning. You should take note that this applies only for automatic transmission vehicles as there are no issues with five-speed stick shifts or manual transmissions in general!

The most common issue affecting Cherokee automatics is an oil pump driven by the camshaft timing belt which stops working due to worn out bearings at approximately 115k miles on some Jeeps (the average lifespan of these pumps usually ranges between 90K-120km). If you’ve done numerous repairs but replaced all fluids too – don’t worry about looking elsewhere just yet;

Problems With Sensors Become More Noticeable

Your PCM has sensors on the radiator, air filter, vacuum pipe, and throttle body. These can affect your Jeep’s performance by causing unnecessary adjustments that will need to be repaired in order for them to function correctly again. Sensor issues rarely point to a defective PCM – usually, the faulty sensor needs replacement or repair before they work properly once more if at all possible.

What Caused Your Jeep Cherokees’ PCM To Die?

You might be wondering why your Jeep Cherokee’s PCM died. Well, there are many reasons a Jeep Cherokee’s PCM can die. Some of the most common include:  -If you have an intermittent or permanent problem with the battery, this could cause your car’s computer to malfunction and eventually stop working altogether.

If you’re experiencing electrical surges that go back and forth from positive to negative on the power supply line, then these will overheat the circuit board in your vehicle and may even short-circuit it! This is one of the most common causes for a dead Jeep Cherokee’s PCM. For more information read our blog post today!

Common Cherokee PCM Problems, Most Common Jeep Cherokee PCM Problems Make Me Crazy!, Mad Digi

Wiring Harness

If you suspect the wiring harness, perform a visual inspection and replace any frayed wires or corroded contacts. If everything looks good visually, follow up with a multimeter to make sure you do not miss anything. A new starter can also cause your PCM to fail, so ensure that it does not lead to a power surge when starting your Jeep as installing one frequently bypasses the surge protector on your PCM.

Dying Battery

The battery is the most common cause of low voltage. It causes shorting out between your PCM and a vehicle’s frame or ground when it struggles to maintain 12 volts, resulting in many different problems with lights, starters, etc. Replacing the weak battery will typically fix this issue.


The water in your PCM is a deadly foe if it gets inside the unit. Mud will not make any difference when you think about how sudden PCM failures due to submerging your Jeep Cherokee would normally require a replacement of the system. So be wary and remember that even though Jeeps can go off-road with no problem at all, they cannot swim!

External Factors

The same reason your PCM is susceptible to corrosion, thermal stress, and vibration are the reasons it will need routine maintenance. An example of this would be with sensors in your computer; they’re more sensitive than other parts because their magnets and moving elements subject them to wear during use. If you frequently ride on rough terrain then chances are higher that these sensor issues may come up before those who mainly drive around town daily.

Repair or Replace My Cherokee’s PCM?

Replace it. It should cost you around $100 or much more plus reprogramming for your specific Jeep. But repairing the thing will just delay more issues.

Replace it only as a last resort. Make sure you have reset your PCM. You can do it by:

  • Disconnect the positive battery terminal and touch it to ground for 30 seconds, making sure to discharge PCM capacitors
  • Reconnect the cable to the battery
  • Start the Jeep and turn on the headlights
  • Turn headlight off then turn the ignition offCommon Cherokee PCM Problems, Most Common Jeep Cherokee PCM Problems Make Me Crazy!, Mad Digi

Never start with anything other than removing all current from the system by shutting down everything connected. If you have any computer issues, ensure that your code is read first. This will help avoid a cheap repair option that won’t last long.

For example, if the sensor inputs are not working correctly or there’s an issue with battery voltage and ground connections then it might be time to get a new PCM replaced instead of just fixing those individual problems on their own.

Main Takeaways – Jeep Cherokee PCM Problems

As you can see, the Jeep Cherokee has a host of problems that need to be addressed. We hope this article gave you some helpful insight into what’s going on with your car and how to fix it!

I hope this post has helped you better understand the Jeep Cherokee PCM problems and how to solve them. There are a few different solutions that may work for your specific situation, so it’s best to try each one until you find what works for your vehicle.

If in the end, nothing seems to be working, don’t worry! You can always contact an expert who specializes in diagnosing these types of issues from home or take your vehicle into the dealership if it’s still under warranty coverage. Thanks for reading and happy driving!