What Does the Engine Code P0602 Mean?

If your car is showing the P0602 engine code, you’ll need to get your engine control module checked out.
Written by Macy Fouse
Reviewed by Melanie Reiff
If your car is displaying the P0602 engine code, there’s an issue with your engine control module (ECM), also called the powertrain control module (PCM). It doesn’t make driving less safe, but you should get it repaired as soon as possible to avoid any issues with vehicle performance.
Diagnostic trouble codes (DTCs) help identify issues with your car’s engine. When you use an OBD-II code reader, it’s crucial to understand the meaning of the engine codes it displays. This way, you can determine the root of your car trouble, assess the problem, and find the best solution.
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What does the engine code P0602 mean?

Definition: Control Module Programming Error
The P0602 engine code points to an issue with your vehicle’s engine control module (ECM), which monitors itself for any programming errors. 

How much will it cost to fix?

While labor costs to diagnose the issue can cost anywhere between $75 and $150 per hour, if you need to replace your ECM, it’ll run you an average of $1,000. The issue may be a much simpler fix, though. Of course, this price differs for cars and locations.

What can cause the P0602 engine code?

If the OBD-II code reader is showing the P0602 engine code, it could point to a wide range of issues with your Engine Control Module. It’s most likely a programming error in one of the control modules. 
The ECM is an electronic control unit that controls the interactions of all the engine’s parts to produce energy. The ECM consistently monitors a large number of sensors to make sure conditions are operating normally. 
Issues that could produce this engine code include: 
  • Faulty or damaged wiring within the network
  • New or wrong ECM
  • Blown fuse in the ECM
  • Bad PCM power supply relay

Common symptoms of the P0602 engine code

In most cases, you probably won’t notice many symptoms for this engine code other than the check engine light coming on. Other signs to look for include: 
  • Issues driving and shifting
  • Stalling engine
  • Rough idling
Cars showing this engine code may also notice poor acceleration and decreased fuel efficiency.

How serious is the P0602 engine code? 

Even though it may not feel pressing when driving, the P0602 engine code is pretty serious, as it can drastically affect your vehicle’s performance. Ignoring it for too long could cause further damage to your vehicle. 
A P0602 engine code may eventually lead to a failed emissions test, so it’s best to fix the problem if your state requires certain emissions standards. 
MORE: How to pass emissions testing

Can I fix the P0602 engine code myself?

It may be possible to fix the P0602 engine code at home if you know what you’re doing, but it’s crucial to accurately diagnose the issue before trying to repair it. To do this, a technician will need to inspect all wirings and connectors related to the ECM. They’ll also check for any damaged components or broken connector pins. 
Depending on the source of the issue, you might have to: 
  • Replace damaged or faulty connectors or wirings
  • Replace any faulty components in individual control modules
  • Replacing the entire faulty ECM 
An experienced technician is likely required to make these repairs since the ECM controls so many functions of the engine. That’s why it’s a good idea to take your vehicle to a professional for a thorough diagnostic inspection or repairs.
MORE: Does insurance cover engine failures?

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