Shift Solenoid "D" Control Circuit Low
Diagnostic trouble code P0982 indicates that the transmission control module has detected a low voltage condition in the control circuit for Shift Solenoid 'D'. This typically means the computer sees a short to ground or an abnormal voltage drop, which prevents the solenoid from operating correctly.
This code requires immediate attention as it directly affects transmission operation. Driving with this code can lead to poor vehicle control, limp mode, or further internal transmission damage.
Common symptoms
- Illuminated Check Engine Light
- Transmission slipping or delayed engagement
- Harsh or erratic shifting
- Inability to shift into certain gears
- Vehicle entering limp mode (restricted to a single gear)
Likely causes
- Short to ground in the Shift Solenoid 'D' wiring harness
- Faulty Shift Solenoid 'D'
- Corroded, loose, or damaged electrical connectors
- Contaminated transmission fluid causing electrical interference or mechanical binding
- Internal transmission valve body failure
- Faulty Transmission Control Module (TCM) or PCM
What to check before replacing parts
Inspect the transmission fluid level and condition.
Look for: Look for burnt, dark, or metal-contaminated fluid which can cause solenoid failure or indicate internal transmission damage.
Visually inspect the wiring harness and connectors for Shift Solenoid 'D'.
Look for: Look for chafed wires, melted insulation, or corroded pins that could cause a short to ground in the control circuit.
Measure the internal resistance of Shift Solenoid 'D' using a digital multimeter.
Look for: Compare the reading to the manufacturer's specification; a reading of zero or significantly out-of-spec indicates a shorted or failed solenoid.
Test the control circuit wire between the TCM and the solenoid for a short to ground.
Look for: A continuity beep or low resistance reading to the vehicle chassis indicates a shorted wire that needs to be repaired or replaced.
Use a bi-directional scan tool to command Shift Solenoid 'D' on and off while monitoring circuit voltage.
Look for: If the TCM fails to output the correct voltage despite verified wiring and a functional solenoid, the module itself may be faulty.
This page explains the generic P0982 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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