Question about 2003 Jeep Grand Cherokee

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My GC Jeep throws trouble code po601 Internal control module fault condition (check sum) detected. I don't know what this means

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  • d_tenney Mar 21, 2011

    Thanks a bunch can new firmware be downloaded from the dealer



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This code is telling you that there is an issue with your PCM, and that it needs to be replaced. I would recommend that you pick up one from a salvage yard, it will save you some money.

Posted on Mar 18, 2011

  • Charles Huckeba
    Charles Huckeba Mar 21, 2011

    They can be updated, but I cannot guarantee that the dealer can do it with out shipping it out, or just replacing it with one that has been flashed and reprogrammed.



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Code P0601 on 2001 Chrysler sebring

po601= internal controller failure, internal control module fault condition ( check sum ) detected .

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Code p0601

code PO601 internal control module memory check sum error.

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I have a 2004 Chrysler 300m with a 3.5l engine and getting a 0871 and 0700 code.

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Trouble Code: P0871 (3.5L V6 VIN G Auto)
A/T O/D Pressure Switch Circuit Malfunction

Trouble Code Conditions:
Engine started; vehicle driven in a forward gear, and the PCM detected that the O/D Pressure Switch circuit indicated open or closed at the wrong time.

Possible Causes:

  • Related DTCs may be present
  • O/D pressure is incorrect, or internal transmission faults exist
  • O/D pressure switch circuit is open, shorted to ground or power
  • O/D pressure switch is damaged or it has failed
  • TCM relay power circuit to O/D switch is open (loss of B+)
  • Intermittent wiring or connector problems exist
  • PCM or TCM has failed

Trouble Code: P0700 (3.5L V6 VIN G Auto)
Automatic Transmission Control System Malfunction

Trouble Code Conditions:
Ignition on or engine started. The PCM received a message over the CCD Bus from the Transmission Control Module (TCM) that it had detected a problem and set a trouble code in memory.

Possible Causes:

  • The presence of this code means the TCM detected a problem
  • TCM related Sensor has solenoid is damaged or has failed
  • This code is for information only - check for other TCM codes
  • TCM or PCM has failed

May 08, 2011 | 2004 Chrysler 300M

1 Answer

Check Engine light, had it diagnosed, PO601, Internal Controller Failure

Basically that means that there is an interal fault in the Powertrain Control Module (PCM). There have been many reported PCM failures on Chrysler/Dodge products although it is possible for this to happen on any vehicle. In Dodge/Chrysler products, a P0601 trouble code means that a serial communication failed inside the computer at least 6 times. goodluck
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Jan 24, 2011 | 2000 Chrysler Town & Country

1 Answer

PO601 error code. how to delete it remove etc

P0601....Internal Control Module Memory Check Sum Error
how to clear it ?? honestly do not know but try disconnecting the battery leads and joining them together for a few minutes

Aug 27, 2010 | Dodge Pickup Cars & Trucks

1 Answer

Ck eng. light comes on after geting gas code reades Po601

P 0601 = Internal Controller Failure. PCM (Powertrain Control Module) Internal fault condition has been detected.
To clear the Code (and Engine Light) from the PCM use a OBD II Scan tool. If you do not have one, go to an auto parts store. They can hook one up for free. Clear the code using the Scan Tool. It is not recommended to disconnect the battery to clear the PCM Codes, as it will cause the engine to run rough.
If the Code/Light re-appears, there may be a problem with something else.
Let me know if this helped, or if you have addtional information or questions. Feel free to contact me at!

Jan 14, 2010 | 2002 Dodge Caravan

1 Answer

2006 trailblazer i6 engine has the trouble code Po601 does anyone know what it means? .. i think its the P.C.M. but im not sure. thanks

It's a very strange code. It shows up in the generic "all manufacturer" code list as "P0601 Internal Control Module Memory Check Sum Error"
Here's a complete list and you can see the GM specific codes on that site as well.

Aug 12, 2009 | Chevrolet TrailBlazer Cars & Trucks

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