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DTC codes / P07xx · Transmission / P075C

P075CShift Solenoid G Stuck On

P075C is a generic OBD-II code that indicates the transmission control module (TCM) has detected shift solenoid G is stuck in the energized or 'on' state when it should be off. The TCM commands the solenoid based on driving conditions, and when the expected hydraulic pressure change does not occur, it sets this code and often illuminates the malfunction indicator lamp (MIL).

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaTransmission

Symptoms you may notice

  • The check engine light or transmission warning light is illuminated, often with no other noticeable symptoms.
  • Harsh or delayed shifts, especially when the transmission tries to engage the gear controlled by solenoid G.
  • The transmission may default to a limp mode, staying in a single gear or refusing to shift.
  • Slipping or flaring during gear changes, as hydraulic pressure is not applied correctly.
  • In some cases, the vehicle may hesitate or shudder when accelerating from a stop.

Common causes, most likely first

  1. A faulty shift solenoid G that is mechanically stuck in the open or closed position.
  2. Debris or contaminated transmission fluid clogging the solenoid valve or its hydraulic circuit.
  3. Damaged or corroded wiring and connectors between the TCM and the solenoid.
  4. An internal transmission valve body issue, such as a stuck valve or worn bore, causing incorrect pressure.
  5. Low or degraded transmission fluid that prevents proper solenoid operation.
  6. A rare TCM software or hardware fault incorrectly commanding the solenoid.

How to diagnose and fix it

  1. Check the transmission fluid level and condition; top off or replace fluid if it is low or burnt.
  2. Inspect the solenoid G electrical connector and wiring for damage, corrosion, or loose pins.
  3. Use a scan tool to command solenoid G on and off and listen for a click; no click may indicate a faulty solenoid.
  4. Measure the resistance of solenoid G and compare it to the manufacturer's specification.
  5. Remove the transmission pan and inspect for debris; clean or replace the solenoid pack if contamination is found.
  6. Perform a transmission fluid flush and replace the filter if the fluid is contaminated.
  7. If the solenoid and wiring test good, diagnose the valve body and TCM as per the service manual.

Solenoid G stuck on: hidden causes and checks

  • A stuck-on solenoid G can sometimes be caused by a short to power in the wiring harness, which mimics a failed solenoid but is often overlooked during diagnosis.
  • Contaminated transmission fluid from clutch material or debris is a common culprit that can stick a solenoid, so fluid condition is a critical first check.
  • The code may set intermittently if the solenoid sticks only when cold or under specific pressure conditions, so a thorough road test with a scan tool is essential.
  • Replacing the solenoid without addressing a clogged valve body or worn bore often leads to a repeat failure, so the entire hydraulic circuit should be inspected.
  • Some vehicles use solenoid G for multiple functions, so a failure can affect more than one gear and may be misdiagnosed as a general transmission failure.

Can I keep driving with P075C?

Driving with P075C is generally not recommended because the transmission may enter limp mode or shift unpredictably, increasing the risk of further damage. Avoid heavy acceleration and long trips until the fault is diagnosed and repaired.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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