Torque converter clutch circuit fault
What it means
P1864. Torque converter clutch circuit fault. Converter clutch control circuit failed. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe with 4L60E 1996 to 2006. Impala, Monte Carlo with 4T65E..
Findings, check these first
- Faulty TCC solenoid
- Wiring short in TCC circuit
- Low transmission fluid
- Worn torque converter clutch
- Faulty control module driver
Standard procedure
- Check fluid level and condition
- Test TCC solenoid operation
- Inspect internal wiring harness
- Test control circuit
- Replace solenoid or converter as tests show
Look up another code
Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.
Sources and review
Review: checked against the recorded source material.
- OBDII Code P1864 BUICK - Torque Converter Clutch Circuit | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and GM (Buick) application
No Chevrolet-specific page replays. The Buick GM page titles it torque converter clutch circuit, matching the catalog. The engine-codes generic P1864 page shows a transfer case meaning for the same code, a source conflict noted in the report.
- OBDII Code P1864 CADILLAC - Torque Converter Clutch Circuit | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and GM (Cadillac) application
Fetched directly. The Cadillac GM page repeats the torque converter clutch circuit meaning.
Last updated 2026-09-25.
Report a correction for P1864. Include your vehicle, the issue and a source if you have one.