Shift Solenoid C Stuck On
The Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected that Shift Solenoid 'C' is stuck in the 'On' position. This is typically determined when the transmission fails to achieve the expected gear ratio based on vehicle speed, engine RPM, and throttle position.
A stuck shift solenoid can cause erratic shifting, failure to shift, or put the vehicle into limp mode. Continued driving can lead to internal transmission damage or leave you stranded.
Common symptoms
- Check Engine Light is illuminated
- Transmission fails to shift into certain gears
- Harsh, delayed, or erratic shifting
- Vehicle enters 'limp mode' (restricted to a single gear)
- Decreased fuel economy due to incorrect gear engagement
Likely causes
- Dirty or contaminated transmission fluid
- Defective Shift Solenoid C
- Clogged transmission filter or hydraulic passages
- Faulty transmission valve body
- Damaged or corroded wiring and connectors in the transmission circuit
- Faulty PCM or TCM (rare)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Low fluid levels, a burnt smell, or dark/metallic debris indicating internal wear or lack of hydraulic pressure.
Scan for other related diagnostic trouble codes.
Look for: Other gear ratio, speed sensor, or solenoid codes that might indicate a broader electrical or hydraulic failure.
Inspect the wiring harness and connectors leading to the transmission.
Look for: Frayed wires, melted insulation, or corroded pins that could cause a short to power or ground.
Test Shift Solenoid C electrical resistance and mechanical operation.
Look for: Resistance outside factory specifications (usually 10-30 ohms) or failure to click when manually energized with a jumper wire.
Perform a hydraulic pressure test on the transmission.
Look for: Line pressures that do not meet manufacturer specifications, indicating a valve body or pump issue rather than just the solenoid.
This page explains the generic P0762 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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