TCM to ECM torque reduction circuit fault
What it means
P1895. TCM to ECM torque reduction circuit fault. Torque request signal between modules failed. This Chevy-enhanced code applies to Silverado, Sierra with 4L60E 1999 to 2006. Impala, Monte Carlo with 4T65E..
Findings, check these first
- Open in torque signal wire
- Short in torque signal wire
- Corroded module connectors
- Faulty TCM output
- Faulty ECM input
Standard procedure
- Scan both modules for codes
- Inspect TCM and ECM connectors
- Test torque signal wire
- Repair wiring faults
- Replace faulty module after wire tests pass
Look up another code
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Sources and review
Review: checked against the recorded source material.
- OBDII Code P1895 CADILLAC - TCM To ECM Torque Reduction Circuit | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and GM (Cadillac) application
No Chevrolet-specific page exists. The Cadillac GM page titles it TCM to ECM torque reduction circuit, matching the catalog.
- OBDII Code P1895 BUICK - TCM To ECM Torque Reduction Circuit | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and GM (Buick) application
Fetched directly. The Buick GM page repeats the TCM to ECM torque reduction circuit meaning.
Last updated 2026-09-25.
Report a correction for P1895. Include your vehicle, the issue and a source if you have one.