Transmission MIL request circuit fault
What it means
P1701. Transmission MIL request circuit fault. TCM asked for light but circuit failed. This Chevy-enhanced code applies to Impala, Monte Carlo, Lumina with 4T65E 1997 to 2005. Grand Prix, Regal with 4T65E..
Findings, check these first
- Faulty TCM MIL output
- Open in MIL request wire
- Short in request circuit
- Corroded transmission connector
- Faulty powertrain control module input
Standard procedure
- Scan TCM for stored codes
- Inspect transmission connector
- Test MIL request wire
- Repair wiring faults
- Replace faulty control module if circuit proves good
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.
- P1701 Buick Transmission MIL Request Circuit OBDII Engine Light Trouble Code | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and GM (Buick) application
No Chevrolet P1701 page is archived. The Buick GM page titles it transmission MIL request circuit, matching the catalog. The generic page gives reverse engagement error for other makes. Model and year fitment remain curator claims.
Last updated 2026-09-25.
Report a correction for P1701. Include your vehicle, the issue and a source if you have one.