Engine-Codes - Pontiac - P1860 PONTIAC

P1860 PONTIAC - TCC PWM Solenoid Circuit Electrical

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1860 PONTIAC Possible Causes

  • Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
  • Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted
  • Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection

How is the P1860 PONTIAC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

There is a factory service bulletin for the following Pontiac models:
2000-2004 Pontiac Aztek
2000-2004 Pontiac Bonneville
2000-2004 Pontiac Grand Am
2000-2004 Pontiac Grand Prix
2000-2004 Pontiac Montana
2000-2004 Pontiac Sunfire
Pontiac Factory Service Bulletin OBDII Code P1860

What is the cost to diagnose the P1860 PONTIAC code

Labor: 1.0

The cost to diagnose the P1860 PONTIAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1860 PONTIAC Meaning

The Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve controls the fluid acting on the converter clutch valve. The converter clutch valve controls the TCC application and release. The solenoid attaches to the control valve body within the transmission. The solenoid receives ignition voltage through circuit 239. The Powertrain Control Module (PCM) controls the solenoid by providing a ground path on circuit 418. Current flows through the solenoid coil according to the duty cycle (percentage of ON and OFF time). The TCC PWM solenoid valve provides a smooth engagement of the torque converter clutch by operating during a duty cycle percent of ON time. When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then Diagnostic Trouble Code (DTC) P1860 sets. DTC P1860 is a type B DTC.

More Information

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