AutoCodes – Saturn – P1860 Saturn

P1860 Saturn Code - TCC PWM Solenoid Circuit Electrical

Quick Answer

The Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve controls the fluid acting on the converter clutch valve. Common causes include 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. 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 Saturn indicates TCC PWM Solenoid Circuit Electrical.
Common causes
Common causes include 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.
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.
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Code Popularity 2,219
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 26, 2020
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Code P1860 Saturn Description

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.
OBDII Code P1860 Saturn - TCC PWM Solenoid Circuit Electrical - AutoCodes.com
P1860 Saturn Code - TCC PWM Solenoid Circuit Electrical

What are the Possible Causes of the DTC P1860 Saturn?

  • 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 to Fix the DTC P1860 Saturn?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1860 Saturn code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.

Frequently Asked Questions about P1860 Saturn Code

1. What does the OBDII code P1860 mean on a Saturn?

P1860 indicates an issue with the Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) Solenoid Circuit, typically related to an electrical malfunction.

2. What are the symptoms of a P1860 code in a Saturn?

Common symptoms include poor fuel economy, transmission overheating, difficulty shifting gears, or the Check Engine Light turning on.

3. What causes a P1860 code on a Saturn?

Common causes include a faulty TCC PWM solenoid, damaged or corroded wiring, a defective transmission control module (TCM), or a blown fuse.

4. Can I still drive my Saturn with a P1860 code?

While the vehicle may still be drivable, ignoring the code can lead to further transmission damage or reduced fuel efficiency.

5. How do I fix a P1860 code on my Saturn?

Repairs may include replacing the TCC PWM solenoid, repairing or replacing damaged wiring, clearing corrosion on electrical connections, or replacing a blown fuse.

6. How much does it cost to repair a P1860 code on a Saturn?

Repair costs vary but typically range from $200 to $500, depending on whether the solenoid, wiring, or other components need replacement.

7. Can a P1860 code damage the transmission?

If left unresolved, the issue can cause overheating or excessive wear on the transmission, potentially leading to costly repairs.

8. How is a P1860 code diagnosed?

A mechanic will use a scan tool to verify the code, inspect the TCC PWM solenoid and wiring, and test the electrical circuit for proper voltage and continuity.

9. Can a faulty TCC solenoid be repaired, or does it need replacement?

In most cases, a faulty TCC PWM solenoid must be replaced, as it is not typically repairable.

10. Will clearing the code fix the P1860 issue permanently?

Clearing the code will temporarily turn off the Check Engine Light, but the underlying issue must be repaired to prevent the code from returning.

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