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P0053 Diagnostic Trouble Code Discussion for June 2011

Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Resistance

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Trouble Ticket Help Requests for DTC P0053
Help Request Posted
2005 GMC W5500 Forward W5S042 5.2L MIL Lamp on VIN: 4KDB4B1U75
P0053: B1S1 o2 heater. tested 2 com wires from pcm to tac module. ok. tried new ignition switch, tried disconnecting alternator cable and regulator plug, tried jumper from ground to engine. when running with key off, seems to be 2.5v on black/yellow wire (gd wire). turn on wipers or...
June 03, 2011