2006 Pt Cruiser pcm help!

1160 Views 29 Replies 8 Participants Last post by chuzz, 2 mo ago

Timgreen5000

Discussion Starter · 2 mo ago

Hi guys, I recently acquired a 06 pt and right off the bat I knew the battery light wasn't going to be a dead battery nor alternator. Needless to say, I found over a year old paperwork from a shop saying the pcm was bad. I tried my luck with a duralast preprogrammed pcm and wouldn't even test so I sent it back and installed the original. After that, I bought a dorman tipm and that didn't fix the errors which have changed from a battery light to p0700 and p0882. Just to rule out the tipm completely I installed a junkyard tipm. Same result. Now back to pcm's. I reached out to Myckee and have yet to get a response back. Unfortunately, I dont have time to wait. My question....where else can I go to get a pcm that is reputable? Thank you in advance....Tim

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AllanC

· #2 · 2 mo ago

Timgreen5000 said:
. . . ., I recently acquired a 06 pt and right off the bat I knew the battery light wasn't going to be a dead battery nor alternator. Needless to say, I found over a year old paperwork from a shop saying the pcm was bad. I tried my luck with a duralast preprogrammed pcm and wouldn't even test so I sent it back and installed the original. After that, I bought a dorman tipm and that didn't fix the errors which have changed from a battery light to p0700 and p0882. Just to rule out the tipm completely I installed a junkyard tipm. Same result. Now back to pcm's. I reached out to Myckee and have yet to get a response back. Unfortunately, I dont have time to wait. My question....where else can I go to get a pcm that is reputable? . . . .

You cannot trust documentation that indicates an electrical problem is due to a failed PCM. You have tried several replacement PCM units and the issue is still present. So failed PCM is an incorrect diagnosis. So you will need to start with the basics, define the problem, and then proceed with a logical, methodical diagnosis to find the culprit.

Is battery fully charged? With a fully charged battery what happens when the ignition key switch is turned to the START position? Does starter engage, turns engine crankshaft but engine fails to start and run on its own? Or is there no action when ignition key switch is turned to the START position? Or will the engine run but the transmission is in limp mode (2nd gear only moving forward)?

P0700 is a generic code referring to the transmission controller and more detail is needed. P0882 indicates that the TCM (transmission controller portion of the PCM) has low power input.

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AllanC

· #20 · 2 mo ago

Timgreen5000 said:
. . . .I appreciate that, I have an appointment on Monday to get a second opinion. . . . .

Everyone is thinking failed PCM but there is a lot of "hand shaking" going on in communication between the PCM and TIPM in regards to electronic transmission control. Any compromise in wiring, connectors, etc can cause this code P0882 to be set and the PCM is NOT necessarily the cause.

Attached image goes into detail the theory of operation that contributor ImperialCrown presented in post #10. The PCM signals the TIPM on circuit T15 to power up the transmission control circuitry. So a valid signal must be present on the T15 circuit between the PCM and TIPM.

Before the TIPM powers up the transmission control on circuit T16, it checks the T16 circuit for open, short to ground and short to power. If all checks are valid (no compromise) then circuit T16 is powered up. Follow the checks outlined on circuitry and connectors to make sure wiring integrity is good. The source of the problem may be the wiring and / or connectors and not the PCM or TIPM. A digital volt - ohm meter would be a proper test instrument for checking this circuitry.

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