P0864 OBD-II Trouble Code: Traction Control Module (TCM) Communication Circuit Range/Performance

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0864 code

P0864 is a diagnostic trouble code (DTC) for "Traction Control Module (TCM) Communication Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0864 DIAGNOSTIC Get a fair and transparent estimate upfront

P0864 code definition

The P0864 code is a generic powertrain code related to transmission problems, including sensor failures and pressure faults. In this case, the engine control module (ECM) has detected a fault with the traction control module, specifically related to the communication circuit.

Codes related to the P0864 include:

What the P0864 code means

The P0864 code only applies to vehicles with an electronic traction control system.

Due to the large number of modules utilized, current vehicle’s with a communication area network (CAN) utilize a communication bus to help the ECM share input and output information with the various modules.

When the vehicle’s ECM has failed to receive input or the correct signals from the traction control module, a P0864 code may be stored. The traction control module communication circuit sends information to the ECM, as well as other related controllers, to help determine proper engine RPM and timing, fuel delivery, and more.

What causes the P0864 code?

Several problems may cause a P0864 code including:

What are the symptoms of the P0864 code?

Symptoms of a P0864 code may include:

  • Check engine or warning light may illuminate
  • Traction control light may flash or stay illuminated
  • Decrease in fuel economy
  • Transmission may shift harshly
  • Transmission may not shift at all
  • Transmission may go into “limp” mode
  • Some lack traction may be felt in more slippery road conditions
  • Traction control may fail

How does a mechanic diagnose the P0864 code?

A mechanic may use several methods to diagnose a P0864 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P0864 trouble code
  • Visually inspect all wiring and connectors for signs of damage or corrosion
  • Ensure the traction control module is inactive on the network, and check if any other modules are also inactive
  • If multiple modules are offline, the error is related to the CAN bus
  • Utilize a specialized scanner (such as an Autohex) to help pinpoint the location of the error
  • Use a memory saving device to ensure controllers do not lose their memory during reprogramming
  • Test for power and ground and at the traction control module
  • Check the traction control module data communication line

Common mistakes when diagnosing the P0864 code

The traction control module may be incorrectly replaced when the root of the problem is a damaged or defective switch or poor electrical connection. It is recommended to visually inspect and fully diagnose all possible causes for a P0864 code prior to replacing the traction control module.

How serious is the P0864 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0864 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P0864 code?

Several repairs can fix a P0864 trouble code and include:

Additional comments for consideration regarding the P0864 code

Due to the amount of electrical componentry and circuitry related to the transmission control module communication circuit, it is recommended to seek the assistance from a professional. Use of a specialized scanner can help pinpoint the location more easily.

Need help with a P0864 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
OBD-II
P0864

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0864 code.

SCHEDULE P0864 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,156

Rating Summary
4,752
196
50
27
131
4,752
196
50
27
131

Al

21 years of experience
14 reviews
Al
21 years of experience
Nissan Pathfinder - Check Engine Light is on - Atlanta, Georgia
Al, was cool and very knowledgeable. Being direct and upfront always works. Al, is a credit to the company.

Xavier

10 years of experience
20 reviews
Xavier
10 years of experience
Chevrolet Equinox - Check Engine Light is on - Frisco, Texas
Xavier was GREAT!!! He made sure that I understood everything that he did to my vehicle and answered all my questions. Very thorough and even worked thru the light rain that we had. When I have to use this service again, I hope to be able to request him!

Luis

14 years of experience
52 reviews
Luis
14 years of experience
Kia Sorento - Check Engine Light is on - Las Vegas, Nevada
Luis did an excellent job in determining that this was a warranty issue on bad parts. He has integrity and is good at what he does. I would highly recommend him for any auto repairs that come up.

Reginald

36 years of experience
32 reviews
Reginald
36 years of experience
BMW 325i - Check Engine Light is on - Los Angeles, California
Reginald was incredibly helpful in helping me to diagnose several issues in my car, as well as repair issues to help me pass a break and light test. He even went so far as to come to the brake and light testing location so that he could ensure that the car passed and be there if anything else needed to be fixed on the spot. Absolutely would recommend him to anyone who is looking for an honest and knowledgeable mechanic!


Related questions

I have a 2009 VW Jetta S 2.5L. Why does my car turns on but then it turns off after driving it for a bit/while?

These are the following definitions for the codes you've received: P0864 - Transmission control module (TCM) communication circuit -range/performance problem P0070 - Ambient Air Temperature Sensor - (possibly shorted but most likely not related) P0734 - Gear 4 Incorrect...

More related articles

P2017 OBD-II Trouble Code: Intake Manifold Runner Position Sensor/Switch Circuit High Bank1
P2017 code definition? Intake Manifold Runner Position Sensor/Switch Circuit High Bank1 What the P2017 code means The runner position sensor, also known...
P2710 OBD-II Trouble Code: Shift Solenoid F Interm
P2710 means a problem in a shift solenoid has been detected due to a failing transmission and/or transmission components or an electrical issue.
P0471 OBD-II Trouble Code: Exhaust Pressure Sensor Range/Performance
P0471 means the powertrain control module has detected an voltage that is out of the normal range due to the exhaust back pressure system.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com