P1603 GMC Possible Causes
- Faulty Sensing Diagnostic Module (SDM)
- Sensing Diagnostic Module harness is open or shorted
- Sensing Diagnostic Module circuit poor electrical connection
How do I fix code P1603 GMC
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Cost of diagnosing the P1603 GMC code
Labor: 1.0The cost of diagnosing the P1603 GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
P1603 GMC Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1603 GMC MeaningWith the engine running engine speed over 500 rpm for 10 continuous seconds, the Powertrain Control Module (PCM) did not receive any Sensing Diagnostic Module (SDM) data or received invalid data during a 1 second period.
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