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P1603 Diagnostic Trouble Code Discussion for August 2004

PCM Internal Shutdown Timer Rationality

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Trouble Ticket Help Requests for DTC P1603
Help Request Posted
2000 Volvo S80 2.9 2.9L Hesitation, Surge VIN: YV1TS94D3Y
P1603: throttle unit internal fault. ... head, but the nearest dealer is 500 miles away, customer came in with complaint of vehicle not running smooth going a constant 65mph and cruse won't stay engaged. test drove vehicle and confirmed complaint, vehicle hesitates sometimes or surges slightly. ...
August 04, 2004