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2001 Chrysler LHS P0601 DTC: Can a Remanufactured PCM Fix Engine Misfire and Overheating Issues?

Model: 2001 Chrysler LHS Fault Code: P0601 Posted: 2015-06-23 22:38

I own a 2001 Chrysler LHS with a 3.5L High Output V6 engine. The vehicle was purchased in poor condition—experiencing severe overheating and rough running. I've already replaced the head gaskets and thermostat, which resolved the overheating issue. Now the car runs but exhibits inconsistent performance. A P0601 diagnostic code has appeared. My question is: can I simply purchase a used PCM from a junkyard and install it? Or does the PCM need to be reprogrammed by a dealer? Additionally, could this P0601 code cause symptoms that mimic incorrect timing or poor engine performance? I've tested the coils—unplugging cylinders 1, 3, and 5 shows no noticeable difference in operation. However, when I unplug cylinders 2, 4, and 6, the vehicle responds differently, suggesting a potential misfire issue on those cylinders. Despite my experience as an auto technician over 20 years, I'm now uncertain about what to do next due to limited access to diagnostic tools and equipment in my current location.

Related fault codes

P0601

Comments (8)

Anonymous 2015-06-24 07:07

This appears to involve multiple underlying issues. Do you have live data from a scan tool? For poor engine performance: - Check for spark on all cylinders. - Verify injector pulsing using a noid light. - Confirm compression levels. P0601 is a serious fault—do not source a PCM from a junkyard. A used PCM will not work without proper reprogramming. Search for 'remanufactured PCM' and contact a reputable supplier. Many offer mail-in services where they remove the existing unit, reprogram it with correct software, and return it to you. Be aware that additional fault codes may be stored—please update if you find any new ones.

Anonymous 2015-06-25 11:59

I'm planning to install a remanufactured PCM. How likely is it that this will resolve my issues? The car runs smoothly at idle with slight vibration, but when shifted into gear, it behaves like a vehicle with a faulty MAF sensor—lacking power and responsiveness. This has become very frustrating.

Anonymous 2015-06-25 12:11

Again—do you have live data from a scan tool? Don't rely on the 'key dance' trick to retrieve codes. Basic checks needed: - Spark presence across all cylinders? - Injector pulsing? Use a noid light. - Compression readings? These are essential diagnostics before considering any PCM replacement.

Anonymous 2015-06-26 10:45

I don’t have access to live scan data and can't visit AutoZone. I also lack the funds for a dealer visit. I’ve confirmed compression is present. I removed the fuel rail and observed injector spray—each one pulses properly. I swapped out all coils, and they appear functional. As an experienced technician, I know what to look for—but due to relocating from another state, I don’t have access to proper diagnostic tools or equipment. If the P0601 code is triggered by the key jingle test, does that confirm a serious issue? Is it safe to assume this is not just a minor glitch?

Anonymous 2015-06-26 11:08

You’ve confirmed compression and fuel flow—however, actual PSI readings are needed to verify if specs are met. The key jingle test can trigger some codes but won’t retrieve all stored faults. Consider checking: - All six cylinders for spark - Injector pulse (pulsed, not constant) - Plugs on the misfiring side—cylinders 1, 3, and 5—are you certain they are clean or have carbon buildup? You mentioned only slight carbon on those plugs.

Anonymous 2015-06-27 07:45

Injectors pulse correctly. All six coils tested and function properly. Cylinders 1, 3, and 5 show light carbon deposits; cylinders 2, 4, and 6 have clean plugs. I recently replaced all spark plugs with new ones.

Anonymous 2015-06-27 08:49

You’ve confirmed spark and injector pulse—now focus on compression testing. Since you've had a timing belt replacement, ensure it was properly installed and correctly timed. Try spraying carb cleaner into the intake while attempting to start—the presence of a strong response may indicate a vacuum or intake leak. Note: Even new parts don’t guarantee performance. Always use OEM-quality spark plugs—cheap alternatives often fail prematurely.

Anonymous 2015-06-27 14:41

I’ll have to wait until next week to receive the remanufactured PCM. I'll update once it's installed and tested.