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U0140 Diagnostic Trouble Code Discussion for September 2009

Lost Communication With BCM

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Trouble Ticket Help Requests for DTC U0140
Help Request Posted
2005 Dodge Grand Caravan 3.3L MIL Lamp on VIN: 1D4GP24R15
U0140: No Body Bus Messages. has bus codes and not sure how to proceed, checked connections at pcm, checked dash conn
September 01, 2009
2007 Chevrolet Monte Carlo LT 3.5L MIL Lamp on, Reduced power. VIN: 2G1WK15N97
U0140: Lost Communication With BCM. Vehicle is salvaged. Customer pulled code P2135 and replaced the TAC with one from a wrecking yard. Same code with both units. I have scoped both TPS sensors KOEO and get a good waveform and low voltages (.8V), but according to Mitchell I should see at least 4...
September 23, 2009