Shift Solenoid C Intermittent
P0764 indicates that the transmission's Shift Solenoid C is experiencing intermittent electrical or mechanical faults, preventing reliable gear shifts. This code sets when the PCM detects inconsistent solenoid operation that affects transmission pressure control and shift timing.
What You Might Notice
- Transmission slipping between gears
- Transmission overheating
- Transmission catching or hesitating in gear
- Decreased fuel economy
- Check Engine Light illuminated
- Vehicle entering limp mode or reduced power mode
Most Common Causes
- 1
Faulty Shift Solenoid C
The solenoid itself may be sticking, binding, or failing intermittently. Electrical coil resistance issues or mechanical wear can cause inconsistent valve actuation and trigger the code.
- 2
Corroded or damaged wiring/connector
Poor electrical connections, corrosion, or damaged wiring harness to the solenoid prevents reliable signal transmission. Intermittent contact breaks signal flow intermittently.
- 3
Low or contaminated transmission fluid
Insufficient fluid level reduces hydraulic pressure needed for solenoid operation, while contaminated or dirty fluid can cause solenoid sticking and valve body restriction.
- 4
Transmission valve body or internal failure
A defective valve body, restricted hydraulic passages, or internal transmission damage prevents proper solenoid response and pressure regulation.
How to Diagnose It
- 1
Check Faulty Shift Solenoid C — The solenoid itself may be sticking, binding, or failing intermittently. Electrical coil resistance issues or mechanical wear can cause inconsistent valve actuation and trigger the code.
- 2
Check Corroded or damaged wiring/connector — Poor electrical connections, corrosion, or damaged wiring harness to the solenoid prevents reliable signal transmission. Intermittent contact breaks signal flow intermittently.
- 3
Check Low or contaminated transmission fluid — Insufficient fluid level reduces hydraulic pressure needed for solenoid operation, while contaminated or dirty fluid can cause solenoid sticking and valve body restriction.
- 4
Check Transmission valve body or internal failure — A defective valve body, restricted hydraulic passages, or internal transmission damage prevents proper solenoid response and pressure regulation.
How to Fix It
- 1
Inspect and test Shift Solenoid C
Locate the solenoid, measure electrical resistance and continuity with a multimeter, and perform a bench test if possible. Replace if resistance values are outside manufacturer specifications or if the solenoid fails to operate.
- 2
Check and repair wiring and connectors
Inspect the solenoid connector for corrosion, bent pins, or loose connections. Clean contacts with electrical contact cleaner, repair or replace damaged wiring harness, and ensure all connections are secure.
- 3
Change transmission fluid and filter
Drain old fluid, replace the transmission filter and pan gasket, and refill with the manufacturer-specified fluid type to the correct level. Contaminated fluid can cause solenoid sticking and valve body problems.
- 4
Inspect transmission valve body and internal components
If other repairs fail, have a professional inspect the valve body for damage, restricted passages, or internal transmission failure. Internal repairs typically require transmission overhaul or replacement.
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