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P1603 Diagnostic Trouble Code Discussion for July 2006

PCM Internal Shutdown Timer Rationality


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Trouble Ticket Help Requests for DTC P1603
Help Request Posted
1998 Oldsmobile Aurora 4.0L No Start, irratic systems VIN: 1G3GR62CXW
P1603: loss of sdm serial data. Tach jumps around all the time. Speedometer will start to jump and eventually will peg at 160mph while driving 40mph. when this happens, the a/c cuts out, the rest of the dash gauges go to their rest position, traction control light comes on, and a few other o...
July 15, 2006
1998 Oldsmobile Aurora 4.0L No Start, irratic systems VIN: 1G3GR62CXW
P1603: loss of sdm serial data. Tach jumps around all the time. Speedometer will start to jump and eventually will peg at 160mph while driving 40mph. when this happens, the a/c cuts out, the rest of the dash gauges go to their rest position, traction control light comes on, and a few other o...
July 15, 2006