Pressure Control Solenoid "G" Control Circuit High
The transmission control module has detected a high voltage signal on the Solenoid G control circuit, indicating an electrical fault in the transmission's pressure control solenoid. This solenoid regulates fluid pressure in the transmission; when it malfunctions, the transmission may enter limp mode and shift improperly.
What You Might Notice
- Check Engine Light illuminated
- Transmission shifts hard or slips between gears
- Increased fuel consumption
- Transmission enters limp mode with limited gear selection
- Transmission overheating
Most Common Causes
- 1
Wiring short to power
The solenoid control wire may be shorted to battery voltage, causing the PCM to read an abnormally high signal. Inspect the wiring harness for damage, pinches, or exposed conductors.
- 2
Faulty pressure control solenoid
The solenoid itself may have an internal short or be stuck open, preventing proper current control. The solenoid may need replacement if electrical testing confirms the fault is not in the wiring.
- 3
PCM or transmission control module fault
The transmission control module may have a defective driver circuit that incorrectly reports the solenoid voltage as high. Module reprogramming or replacement may be necessary.
- 4
Corroded connectors or poor grounds
Corrosion in the solenoid connector or loose ground connections can cause erratic voltage readings. Clean connectors and verify solid ground connections at the transmission control module.
How to Diagnose It
- 1
Check Wiring short to power — The solenoid control wire may be shorted to battery voltage, causing the PCM to read an abnormally high signal. Inspect the wiring harness for damage, pinches, or exposed conductors.
- 2
Check Faulty pressure control solenoid — The solenoid itself may have an internal short or be stuck open, preventing proper current control. The solenoid may need replacement if electrical testing confirms the fault is not in the wiring.
- 3
Check PCM or transmission control module fault — The transmission control module may have a defective driver circuit that incorrectly reports the solenoid voltage as high. Module reprogramming or replacement may be necessary.
- 4
Check Corroded connectors or poor grounds — Corrosion in the solenoid connector or loose ground connections can cause erratic voltage readings. Clean connectors and verify solid ground connections at the transmission control module.
How to Fix It
- 1
Inspect and repair wiring harness
Visually inspect the transmission solenoid G control circuit wiring for cuts, abrasion, or signs of shorting. Repair or replace any damaged sections and verify continuity with a multimeter.
- 2
Clean solenoid connectors
Disconnect the solenoid connector and clean all terminals with electrical contact cleaner to remove corrosion. Reconnect firmly and retest the circuit voltage with a diagnostic scanner.
- 3
Replace pressure control solenoid G
If wiring tests pass but voltage remains high, the solenoid is likely faulty. Remove and replace the solenoid with an OEM or quality replacement part.
- 4
Reprogram or replace transmission control module
If all solenoid and wiring checks pass, the TCM driver circuit may be defective. Have the module reprogrammed by the dealership or replaced if reprogramming fails.
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