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Home >> Jeep >> 2025 >> Compass Trailhawk >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P0633 To P0698 >> DTC Troubleshooting >> P0688 ASD/Main Sense Circuit >> Possible Causes
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Possible Causes

Possible Causes
ASD RELAY OUTPUT CIRCUIT OPEN
ASD RELAY OUTPUT CIRCUIT SHORTED TO GROUND
POWER DISTRIBUTION CENTER (PDC)
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to:  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .