Question about 2004 Jeep Grand Cherokee

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My jeep gand cherokee went into limp mode 150km after having a custom made freeflow exhuast system fitted. My regular mechanic who has a diagnostic box with limited capacity picked up fault code "p1652 Combust". The gearbox was also reconditioned 3500 km ago and the gearbox-engine harness repaired at the same time. My mechanic "cancelled the problem" so the car is going fine, but no actul lwork was done on the car. Can I take it that the problem is solved (by itself) or should I have the car taken back to either the guys who did the exhaust or the guys who did the gearbox and harness?

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  • Jeep Master
  • 17,970 Answers

According with the parts ans jobs there, sound like a electrical problem or harnesses connections problem; Jeep DTC P1652 is refer at J1850 Communication Bus short to ground.

The J1850 Connector is the connector that you plug the OBDII Scan tool into. It is located under the dash facing the driver's seat (generally). Sometimes this occurs under "unauthorized reset" condition.

HERE you have additional details. In order to solve it, you will need visit your local Jeep dealer.

I know that isnt good news, but hope this helps.

Posted on Feb 16, 2012

  • Roger Adams Feb 17, 2012

    I do not understand what you mean by: "...Jeep DTC P1652 is refer at J1850 Communication Bus short to ground...." please explain in simple language.

  • ZJ Limited
    ZJ Limited Feb 17, 2012

    You have a "communication problem" with the connector (named J850), this is the reason because PCM (Powetrain Control Module, called computer) showed code P1652. This cpnnecto could be damaged.

    In the previous link, check the diagram and pin number 2 and 10, they are related at J1850. If you dont understand this, I sugges strongley check, test and make this job with some specialist in your local area or your Jeep dealer.

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