AutoCodes – Generic – P1864

P1864 Code - Torque Converter Clutch Enable Solenoid Electrical Fault Conditions

Quick Answer

The Torque Converter Clutch (TCC) Solenoid Valve is an electrical device used with the TCC PWM Solenoid Valve in order to control the fluid acting on the TCC valve. Common causes include Faulty Torque Converter Clutch (TCC), Torque Converter Clutch (TCC) harness is open or shorted, Torque Converter Clutch (TCC) 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: P1864 indicates Torque Converter Clutch Enable Solenoid Electrical Fault Conditions.
Common causes: Common causes include Faulty Torque Converter Clutch (TCC), Torque Converter Clutch (TCC) harness is open or shorted, Torque Converter Clutch (TCC) 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 20,286

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1864 Description

The Torque Converter Clutch (TCC) Solenoid Valve is an electrical device used with the TCC PWM Solenoid Valve in order to control the fluid acting on the TCC valve. The TCC valve controls TCC application and release. The solenoid is a normally-open, ON/OFF device. The TCC Sol. Valve attaches to the transmission case assembly extending into the pump cover. The Vehicle Control Module (VCM) monitors the Throttle Position (TP) voltage, the vehicle speed, and other inputs in order to determine when to energize the TCC Sol. Valve.
With the engine speed over 500 rpm for 5 seconds, not in Fuel Shut-off mode, the Powertrain Control Module (PCM) detects the Torque Converter Clutch (TCC) Solenoid Control voltage did not meet calibration (too high or too low). - Refer to the correct code repair chart in other manuals or media.

OBDII Code P1864 - Torque Converter Clutch Enable Solenoid Electrical Fault Conditions - AutoCodes.com — P1864 Code - Torque Converter Clutch Enable Solenoid Electrical Fault Conditions

What does this mean?

What are the Possible Causes of the DTC P1864?

Faulty Torque Converter Clutch (TCC)
Torque Converter Clutch (TCC) harness is open or shorted
Torque Converter Clutch (TCC) circuit poor electrical connection

How to Fix the DTC P1864?

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 P1864 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.

Need more information about the P1864 code?

Need more information on how to fix the P1864 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1864 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1864 Buick — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
P1864 Cadillac — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
P1864 Chevrolet — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
P1864 GMC — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
P1864 Mitsubishi — High Side 1 System Short To Power Supply
P1864 Oldsmobile — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
P1864 Pontiac — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions
P1864 Saturn — Torque Converter Clutch Enable Solenoid Electrical Fault Conditions

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 P1864 Code

What does the OBDII code P1864 mean?

P1864 indicates an electrical fault in the Torque Converter Clutch (TCC) Enable Solenoid, which is responsible for engaging and disengaging the torque converter clutch in the transmission.

What are the common symptoms of code P1864?

Common symptoms include poor fuel economy, transmission slipping, delayed or harsh shifting, and the Check Engine Light or transmission warning light illuminating.

What causes the P1864 code to trigger?

The code can be triggered by a faulty TCC solenoid, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or a low transmission fluid level.

Can I drive my vehicle with a P1864 code?

It’s possible to drive with this code, but it may lead to increased fuel consumption, rough shifting, and potential damage to the transmission if not addressed promptly.

How do I diagnose the P1864 code?

Diagnosis involves checking the TCC solenoid’s electrical connections, inspecting wiring for damage, testing the solenoid’s resistance, and using a scan tool to monitor TCC operation.

How is the P1864 code repaired?

Repairs may include replacing the TCC solenoid, repairing or replacing damaged wiring or connectors, topping off or replacing transmission fluid, or reprogramming/replacing the TCM if necessary.

Can low transmission fluid cause a P1864 code?

Yes, low or degraded transmission fluid can cause improper operation of the TCC solenoid, leading to the P1864 code.

How much does it cost to fix a P1864 code?

The repair cost varies but typically ranges from $150 to $500, depending on whether the solenoid, wiring, or TCM needs to be replaced or repaired.

Will clearing the P1864 code with a scan tool fix the problem?

Clearing the code will turn off the Check Engine Light temporarily, but the issue will persist if the underlying fault is not repaired.

What preventative maintenance can help avoid a P1864 code?

Regularly check and replace transmission fluid as needed, inspect wiring for damage, and address transmission issues promptly to prevent solenoid-related faults.