Pressure Control Solenoid "D" Control Circuit High
The PCM detected an electrical voltage problem in the Solenoid D control circuit, with the signal reading higher than expected. This solenoid regulates transmission fluid pressure, and the fault prevents proper shift control, often triggering limp mode to protect the transmission.
What You Might Notice
- Check Engine Light illuminated
- Transmission shifts hard or bangs into gear
- Transmission slips during acceleration
- Increased fuel consumption
- Transmission overheating
Most Common Causes
- 1
Solenoid D wiring short to power
The control circuit wire is shorted to battery voltage, causing the voltage to read higher than the PCM's expected range. This is the most common electrical cause of high voltage codes.
- 2
Failed Pressure Control Solenoid D
The solenoid itself has an internal short or winding failure, drawing excessive current and raising the circuit voltage abnormally.
- 3
Connector corrosion or loose connection
Corroded or improperly seated connectors at the solenoid can cause resistance issues that result in voltage irregularities, often intermittently.
- 4
PCM or transmission control module failure
A faulty engine or transmission control module may incorrectly report high voltage, though this is rare and usually confirmed after other components are verified.
How to Diagnose It
- 1
Check Solenoid D wiring short to power — The control circuit wire is shorted to battery voltage, causing the voltage to read higher than the PCM's expected range. This is the most common electrical cause of high voltage codes.
- 2
Check Failed Pressure Control Solenoid D — The solenoid itself has an internal short or winding failure, drawing excessive current and raising the circuit voltage abnormally.
- 3
Check Connector corrosion or loose connection — Corroded or improperly seated connectors at the solenoid can cause resistance issues that result in voltage irregularities, often intermittently.
- 4
Check PCM or transmission control module failure — A faulty engine or transmission control module may incorrectly report high voltage, though this is rare and usually confirmed after other components are verified.
How to Fix It
- 1
Inspect and repair wiring harness
Locate the Solenoid D control circuit wiring, check for cuts, pinches, or corrosion that could cause a short to power. Repair or replace damaged sections of the harness.
- 2
Clean and reseat connectors
Disconnect the solenoid connector, clean the terminals with electrical contact cleaner to remove corrosion, and firmly reconnect. Inspect for bent pins or loose terminals.
- 3
Replace Pressure Control Solenoid D
Remove the failed solenoid from the transmission valve body and install a new OEM or quality replacement, ensuring proper sealing and electrical connection.
- 4
Reprogram or replace transmission control module
If all solenoid and wiring tests pass, the transmission control module or PCM may require reprogramming or replacement by a qualified transmission specialist.
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