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Engine-Codes – GMC – P1860 GMC

P1860 GMC Code - TCC PWM Solenoid Circuit Electrical

Quick Answer

The P1860 GMC diagnostic trouble code refers to the TCC (Torque Converter Clutch) PWM (Pulse Width Modulation) solenoid circuit electrical issue. Common causes include Damaged wiring, Faulty TCC solenoid, Poor connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1860 GMC indicates TCC PWM Solenoid Circuit Electrical.
Common causes
Common causes include Damaged wiring, Faulty TCC solenoid, Poor connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P1860 GMC Description

The P1860 GMC diagnostic trouble code refers to the TCC (Torque Converter Clutch) PWM (Pulse Width Modulation) solenoid circuit electrical issue. This code indicates a problem with the electrical circuit that controls the TCC solenoid, which is responsible for engaging and disengaging the torque converter clutch. The torque converter clutch is essential for improving fuel efficiency and preventing the engine from overheating during prolonged periods of driving.

OBDII Code P1860 GMC - TCC PWM Solenoid Circuit Electrical
P1860 GMC Code - TCC PWM Solenoid Circuit Electrical

Common Causes of P1860 GMC

  1. Damaged wiring
  2. Faulty TCC solenoid
  3. Poor connections
  4. Malfunctioning PCM

Symptoms of P1860 GMC

  1. Poor fuel economy
  2. Transmission slipping
  3. Harsh shifting
  4. Engine stalling
  5. Increased operating temperatures

How to Fix P1860 GMC

  1. Perform a thorough inspection of the TCC solenoid circuit, including wiring and connections.
  2. Test the TCC solenoid for proper functionality and replace if necessary.
  3. Check the PCM for any faults and reprogram or replace if needed.
  4. Clear the trouble code from the vehicle's memory and test drive to ensure the issue is resolved.

Cost to Fix P1860 GMC

The typical repair costs for addressing a P1860 GMC code can range from $200 to $500, depending on the specific cause of the issue and the cost of parts. It's important to note that labor rates and diagnosis time can vary, so it's advisable to check with local auto repair shops for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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