Start by checking 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.
The cost to diagnose the P0971 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The clutch pressure control (PC) solenoid 3 is part of the control solenoid valve assembly which has no serviceable components. The normally high clutch PC solenoid 3 regulates and directs oil pressure to the R1/4-5-6 regulator valve. Increasing clutch PC solenoid 3 pressure increases pressure to the low and reverse clutch or 4-5-6 clutch, depending on the position of the clutch select valve. The transmission control module (TCM) PC Solenoid 3 low side driver varies current to the solenoid. Decreasing the current to clutch PC solenoid 3 increases oil pressure by closing off the solenoid exhaust port. Increasing the current to the clutch PC solenoid 3 decreases oil pressure by opening the exhaust port. Clutch PC solenoid 3 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If an excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.
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