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Thread: p1351, anyone know what this means ?

  1. #1
    Registered User
    Join Date
    Mar 2004

    p1351, anyone know what this means ?

    I've got a 95 jimmy, ses light is on, and when i plug in a scanner it comes up with code p1351, Has anyone ever come across this before ?
    When I looked up the code list, it says "ignition coil control circuit high voltage". Just wondering if anyone knows how to fix this.
    My mechanic wants to take the process of elimination approach to it, but god only knows whats thats gonna end up costing.
    Thanks in advance for any help.

  2. #2
    Resident Geek el guapo's Avatar
    Join Date
    Feb 2002
    Newark, DE
    check the simple stuff first - make sure you've got good grounds throughout your ignition system (coil/control module/dist cap).

    process of elimination shouldn't be too expensive - an aftermarket MSD ignition coil for our trucks is less than $50. if that doesn't clear the code, relace the module. you can either go OEM replacement, or (what I'd do) upgrade to an MSD box.

  3. #3
    Insane Network Engineer rlith's Avatar
    Join Date
    Dec 2002
    Pittsburgh, PA
    Code P1351 Ignition Control (IC) Circuit High Voltage

    Swap out your coil first to test.
    This diagnostic will set when the following conditions are met:
    Voltage on IC circuit is greater than 4.9 volts and engine speed is less than 250 RPM.
    Basically the engine is either at rest or cranking when the VCM (PCM) is monitoring for the high voltage diagnstic.
    The PCM has an internal 5 volt reference that's used for several circuits. This voltage is dropped across a resistor and fed to the corresponding control circuit. The BCM monitors this voltage to determine circuit integrity.
    You could have a wiring problem between the PCM (ICU) and BCM, or a problem with the connector(s) at either the PCM or BCM, or the BCM is going bad.
    For this problem a wiring diagram is your friend. You can check the connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, or rubbed through wire(s).
    Check the PCM to BCM wiring very close.
    A good way to find a wiring problem is to clear the code. Monitor the reference voltage while having someone pull on wiring at the BCM/PCM and wiggling the harnesses. If this makes the voltage to go high you know it's a wiring problem. If the voltage remains constant and the code RESETS than the VCM is the problem.
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