AutoCodes – Cadillac – P1860 Cadillac

P1860 Cadillac 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 Cadillac 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 38,897

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 26, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
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Code P1860 Cadillac 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 Cadillac - TCC PWM Solenoid Circuit Electrical - AutoCodes.com — P1860 Cadillac Code - TCC PWM Solenoid Circuit Electrical

What does this mean?

What are the Possible Causes of the DTC P1860 Cadillac?

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 Cadillac?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1860 Cadillac 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.