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Looking for code 42 explanation on GM 2.8 liter

steelpointsteelpoint Member Posts: 1
edited March 2014 in Chevrolet
I'm driving a 87 Celebrity. The computer is posting a code 42 and I'm looking for someone who knows what sensor I need to check and how.
Thanks [email protected]


  • 0patience0patience Oregon CoastMember Posts: 1,712
    Code 42 is the EST (Electronic Spark Timing) circuit.
    Check all connections to the ignition module and ECM.
    Then clear the codes and retest.
    If the code 42 comes back, then it will be time to aquire a DVOM (digital volt/ohm meter) and do some testing with the help of a diagnostic flow chart.
    Here is a page that will provide you with some more information.
    GM trouble code info
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