Applicable Systems
OBD-II
Symptoms
Torque converter clutch (TCC) solenoid circuit fault; TCC may not engage; highway fuel economy reduced.
Possible Causes
- TCC solenoid internal failure
- Solenoid wiring fault
- TCC control circuit from TCM open/short
Troubleshooting Steps
- Step 1: Check TCC solenoid resistance
Resistance within spec (20-40 ohm) - Step 2: Inspect solenoid wiring
Wiring intact - Step 3: Check TCC operation with scanner
TCC engages when commanded - Step 4: Replace TCC solenoid if faulty
TCC engages correctly - Step 5: Clear code and verify TCC lock-up
TCC engages at highway speed
How to Reset
Clear with OBD-II scanner after solenoid replacement.
Common Replacement Parts
- TCC Solenoid (OEM spec)
Frequently Asked Questions
- Q: What does torque converter clutch do?
Locks torque converter to eliminate slip (like manual clutch). Improves fuel economy at highway speed. Disengages at low speed for smooth operation.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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