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Check Engine Light

Discussion in 'Peterbilt Forum' started by RT76, Aug 28, 2014.

  1. Aug 28, 2014 #1
    RT76

    RT76 Bobtail Member

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    Aug 28, 2014
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    I have a 96 378, just put in a 99 3406E and all is good except for the check engine light and volt meter.

    The check engine light blinks 5 - pause 5. Not sure what it is.

    The volt meter is only reading 13.5 volts. I have 14.3 at the alternator and 14.07 at the starter. Checked both sides of the frame mounted circuit breaker and it is the same. I don't know where else to look.
     
    RT76, Aug 28, 2014
    RT76, Aug 28, 2014
    #1
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  3. Aug 28, 2014 #2
    GrapeApe

    GrapeApe Road Train Member

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    55 means no codes. Check the wiring to the cruise switches.

    What is the voltage at the voltmeter?
     
    GrapeApe, Aug 28, 2014
    GrapeApe, Aug 28, 2014
    #2
  4. Aug 28, 2014 #3
    RT76

    RT76 Bobtail Member

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    Aug 28, 2014
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    I have 13.6 at the meter. There is no cruise control. Used to be on the shifter but it was removed a few years ago
     
    RT76, Aug 28, 2014
    RT76, Aug 28, 2014
    #3
  5. Aug 28, 2014 #4
    stellar

    stellar Bobtail Member

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    Aug 28, 2014
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    i have a newer truck and probably more tech stuff but my gas cap was loose causing the engine light on
     
    stellar, Aug 28, 2014
    stellar, Aug 28, 2014
    #4
  7. Aug 29, 2014 #5
    GrapeApe

    GrapeApe Road Train Member

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    Find the cruise swtich wires. To pull flash codes, you use the cruise swtiches, you truck is stuck in flash mode. This is probably becuase the set/resume swtich wires are shorted together.
     
    GrapeApe, Aug 29, 2014
    GrapeApe, Aug 29, 2014
    #5
  8. Aug 29, 2014 #6
    RT76

    RT76 Bobtail Member

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    Aug 28, 2014
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    Thank You! cruise control wire had a short
     
    RT76, Aug 29, 2014
    RT76, Aug 29, 2014
    #6
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