No bus ??

[Jason6903]

Hey All, I need some help from the smart people. I have an 03 1500 with the 5.9. It now says no bus, all gauges are at rest, dash lights are on and my computer, not a code reader, Cornwell techforce diagnostic computer will not read anything. Is the PCM bad? What else can I test prior to condeming the PCM?

 

[HemiLonestar]

No bus means an important enough wire has been messed with and interrupted communication along the bus between modules. You install something recently?

 

[Fishstickz]

Are your headlights on with the dash lights? On my 06 if the headlight switch isn’t connected the headlights come on automatically, and yours might be the same. That goes along with what lonestar said, you probably have a loose connection or if you just recently added something, may have forgotten to plug a connector back in

If you did do some disconnecting recently thats where I would check first


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[Oliver Closehauf]

Check this out.

New 2020 test using a voltmeter can fix NO Communication and wiring problems for 2005 Dodge 1500 trucks! (automotivetroubleshootingsecrets.com)