Incorrect ratio Diagnostic Trouble Code (DTC) may indicate a component condition with piston seals, clutch plates, or solenoids or it may be caused by a faulty turbine or output speed sensor signal.
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 P0732 GMC 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.
The transmission turbine speed sensor and vehicle speed sensor are hall-effect sensors. The turbine speed sensor is mounted to the transmission housing and faces the reluctor attached to the 1-2-3-4-5-6 clutch piston housing. The vehicle speed sensor is mounted to the low and reverse clutch housing on 2WD, or transfer case rear case half on 4WD. The vehicle speed sensor faces a reluctor wheel attached to the transmission output shaft on 2WD, or a reluctor wheel attached to the transfer case rear output shaft on 4WD.
The TCM provides a 9 V reference circuit and a signal circuit to each of the sensors. As the 1-2-3-4-5-6 clutch piston housing and transmission output shaft or transfer case output rotates, the sensors produce a signal frequency based on the teeth on the reluctor wheel. The TCM calculates the transmission gear ratio based on the speed sensor signals and compares the calculated gear ratio to the commanded gear ratio.
The Diagnostic Trouble Code (DTC) will be set when the TCM detects the calculated gear ratio with 2nd gear commanded differs from the known 6th gear ratio for 2 s.
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