pcm troubles, i think!
pcm troubles, i think!
one morning i went to drive my car and it started just fine but i left my parking brake on and when i tried to go i killed it obviously, but when i went to start it again it wouldn't start and the DIC showed "engine power reduced" and "Engine disabled". i unhooked the battery and then it started fine again. i made it about 100 feet and it did it again. but instead of unhooking the battery again i waited like a minute and it started again but the CEL was on and it kept doing this randomly. i got the code pulled and it was P0601, or Internal control module memory check sum error. i did some research and most of the sources say to replace pcm. has this problem affected anyone else and know any solutions?
also my car has been randomly for the past month starting and misfiring for about 3 minutes and then snaps out of it. but it only randomly does this, and i'm not sure if these problems are linked or if i have two separate problems.
also my car has been randomly for the past month starting and misfiring for about 3 minutes and then snaps out of it. but it only randomly does this, and i'm not sure if these problems are linked or if i have two separate problems.
my SM says (for the 2.2/2.4L which I've understood to run a similar ecm type to yours) says the following;
page 6-88 shows a flow chart on how technicians are supposed to go about confirming the issue, as well as record or proceed with it..
from page 6-92;
With that very last point, have you tried actually clearing it?
Older cars would easily erase codes when the battery is disconnected - but to the best of my knowledge, these ones will store codes/issues...
good luck!!
Diagnostic instructions:
Descriptions
DTC P0601: Control Module Read Only Memory (ROM)
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Conditions for running the DTCs:
P0601
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Conditions for setting the DTCs:
The ECM detects an internal failure or incomplete programming for more than 10 seconds.
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Actions taken when the DTC sets:
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Conditions for clearing the MIL.DTC:
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Repair instructions:
- Perform the Diagnostic System Check - Vehicle on 6-91 prior to using this diagnostic procedure.
- Review the Strategy Based Diagnostics on page 6-88 for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions on page 6-89 provides an overview of each diagnositc catagory.
Descriptions
DTC P0601: Control Module Read Only Memory (ROM)
-----------
Conditions for running the DTCs:
P0601
- The ignition switch is in Run or Crank.
- DTC P0601 runs continuously when the above condition is met.
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Conditions for setting the DTCs:
The ECM detects an internal failure or incomplete programming for more than 10 seconds.
-----------
Actions taken when the DTC sets:
- DTCs P0601, P0602, P0603, P0604, P0606, P060D, and P062F are Type A DTCs.
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Conditions for clearing the MIL.DTC:
- DTCs P0601, P0602, P0603, P0604, P0606, P060D, and P062F are Type A DTCs.
-----------
Repair instructions:
- Perform the Diagnostic Repair Verification on page 6-113 after completing the diagnostic procedure.
page 6-88 shows a flow chart on how technicians are supposed to go about confirming the issue, as well as record or proceed with it..
from page 6-92;
Powertrain Diagnostics Trouble Code (DTC) Type Definitions:
Emissions related DTCs:
Actions taken when DTC sets - Type A:
-----------
Conditions for clearing the MIL/DTC - Type A and Type B
Emissions related DTCs:
Actions taken when DTC sets - Type A:
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at hthe time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
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Conditions for clearing the MIL/DTC - Type A and Type B
- The control module turns off the MIL after 4 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emissions related diagnostic.
- Clear the MIL and teh DTC with a scan tool.
Older cars would easily erase codes when the battery is disconnected - but to the best of my knowledge, these ones will store codes/issues...
good luck!!
i havent tried legitimately clearing with a scan tool, but the guy that tunes my car reflashed my tune on the car and the DTC still popped up a day later with the code and the ENGINE POWER REDUCED and ENGINE DISABLED.
Senior Member
Joined: 09-02-09
Posts: 4,210
Likes: 2
From: Wisconsin
From what I've read here, I would say your PCM = Toast You'll have to get a new one.
That also means that in adition to getting your tuen reflashed you'll need to have a re-learn acomplished. No big deal though any dealership can do it. I heard you can do it from an interceptor gauge too but dono if its the correct relearn.
That also means that in adition to getting your tuen reflashed you'll need to have a re-learn acomplished. No big deal though any dealership can do it. I heard you can do it from an interceptor gauge too but dono if its the correct relearn.
Platinum Member
Platinum Member
Joined: 04-12-09
Posts: 4,869
Likes: 16
From: Connecticut
InfraRedline can do a case relearn right from hptuners so the OP should be good to go with that part of things, it's just the security relearn that can be a biatch sometimes.
sure hope thats what it is! it went three days and hasnt done it but now i cant drive it cause of the injector.
Last edited by cbro; Jun 17, 2012 at 08:59 PM. Reason: spelling error
New Member
Joined: 02-18-26
Posts: 10
Likes: 0
From: Fairfield, CT
Code P0601 usually points to an internal PCM fault, but it is still worth checking battery voltage, grounds, and wiring first since low voltage can trigger false memory errors. I once heard a technician at Luxury Rides LLC mention weak batteries causing similar reduced power messages. If everything checks out, PCM replacement or reprogramming may be required.
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