Question about 1997 Jeep Grand Cherokee

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The check engine light came on and i used the ignition to find these codes, 12, 42, 45, 46 & 55 what do they mean? this is on a 1997 jeep grand cherokee

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  • Jeep Master
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What problems are you having currently/
12 is battery has been disconnected recently
42 is fuel pump relay circuit
45 is turbo boost, but I suspect your is non-turbo.
46 is usually charging system related.

Posted on Sep 27, 2009

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  • Master
  • 375 Answers

Hello Sir, in your issue first I am giving the description of the Codes:---

  • Code 12 :--- It means that the Battery Input to the PCM has been disconnected for many last key start.
  • Code 42 :--- It means that there is a Open or Shorted condition detected in the Auto-shutdown of the Relay Circuit. Also there is a Open Condition detected in the ASD Relay Output Circuit. The same condition is detected in the Fuel Pump Relay Control Circuit. Also the same condition detected between the PCM and the Fuel Gauge Sending Unit and also the Circuit shorted in Voltage in the same path. And also the Fuel Lever Sendor is not moving.
  • Code 45 :--- It is defined as a Transmission Problem.
  • Code 46 :--- It means that the Battery Voltage sense input is above the Target Charging Voltage. It is detected during Engine Operation.
  • Code 55 :--- It is not a Fault indication. It tells the user that the Fault code Display process is finished.
And for the CEL ( Check Engine Light ), it is caused for the codes 12, 42, 45, 46. Code 55 is not a fault code as I wrote above. Call a mechanic to correct the Codes, this will reset the car's CEL and make it Fault Free.
Thank you Sir, Have a nice day.

Posted on Sep 27, 2009

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