P1860
TCC PWM Solenoid Circuit Electrical
What it means
P1860. TCC PWM Solenoid Circuit Electrical. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Suburban, Savana, Express.
Findings, check these first
- Faulty TCC PWM solenoid valve on the control valve body
- Open or short to ground in the TCC PWM solenoid control circuit
- Corroded AT inline 20-way connector
- Low transmission fluid causing TCC apply concerns
- Faulty powertrain control module driver
Standard procedure
- Verify TCC command versus slip speed with a Tech2 scan tool
- Measure TCC PWM solenoid resistance and compare to 10-15 ohm specification
- Test the control circuit for opens, shorts to ground, and shorts to power
- Inspect the AT inline connector and internal harness
- Replace the TCC PWM solenoid if circuits test normal, then clear and road test
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.
- P1860 Chevrolet TCC PWM Solenoid Circuit Electrical OBDII Engine Light Trouble Code | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and Chevrolet application
Fetched directly. Exact title match, with the TCC PWM solenoid circuit description. Model and year fitment remain curator claims.
Last updated 2026-09-13.
Report a correction for P1860. Include your vehicle, the issue and a source if you have one.