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P0641 Diagnostic Trouble Code Discussion for March 2012

5-Volt Reference 1 Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0641
Help Request Posted
2008 Chevrolet Express 1500 4.3L MIL Lamp on VIN: 1GCFG15X68
P0641: 5v reference 1 circuit. ... with lap top as problem occurrs freeze frame data is not showing any sensor failure.Last failure trip was at 1050 rpm while backing out of our bay.When you clear the code the vehicle runs normal no misfires or performance issues until code p0641 happens th...
March 07, 2012
2007 Hyundai Santa Fe GLS 2.7L Hesitation, no acceleration VIN: 5NMSG13D77
P0641: Sensor Reference 'A' Circuit Low Voltage. Will not accelerate, 5V reference to tps A is low coming out of pcm, it has a code for this p0122, also deep research reveals that accelerator pedal pos sensor A also not getting 5V ref, they are getting 130mv instead, If I cut the 5v ref line at the pcm it st...
March 08, 2012