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 pins.
The cost to diagnose the P1653 Cadillac code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
With the key on or engine running, then with the Vent solenoid requested on (Test 1), the Powertrain Control Module (PCM) detects the voltage on the solenoid control circuit was high (12v), or with the Vent solenoid requested off, the voltage on the Vent solenoid control circuit was near zero (0) volts.
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