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P1860 — TCC PWM Solenoid Circuit (GM)

GM: Torque converter clutch pulse-width modulated solenoid circuit fault.

Severity: MediumRepair: $100-$800Difficulty: Advanced

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Common symptoms of P1860

Common causes of P1860

Repair cost & difficulty

Typical cost to fix P1860: $100-$800 · Difficulty: Advanced

Pro tip: On GM 4L60E/4L65E transmissions, the TCC PWM solenoid controls smooth TCC engagement. A failing solenoid causes shudder at TCC apply speed (usually 40-55 mph).

Vehicles commonly affected

GM — 4L60E, 4L65E, 4L80E

Related trouble codes

P0740P0741P1870

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.