P0859 OBD-II Trouble Code: Traction Control Input Signal High

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0859 code

P0859 is a diagnostic trouble code (DTC) for "Traction Control Input Signal High". 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 P0859 DIAGNOSTIC Get a fair and transparent estimate upfront

P0859 code definition

A P0859 trouble code indicates that the vehicle's Powertrain Control Module (PCM) has reported a malfunction relating to the traction control input signal circuit.

What the P0859 code means

The traction control system regulates several aspects of the vehicle's drive system, particularly with regards to engine power and fuel delivery. A P0859 trouble code will be logged on the vehicle's computer if the PCM fails to receive a signal from the traction control system.

What causes the P0859 code?

  • In the vast majority of cases, the P0859 code is caused by a defective traction control switch. The switch itself may be faulty or damaged. Technicians report defective switches in this code instance are often damaged due to liquid contact.

  • Shorted, corroded and damaged wires may also be to blame for a P0859 signal malfunction. Moreover, technicians have cited a corroded sensor connector as a common reason for this trouble code.

What are the symptoms of the P0859 code?

The reported symptoms of a P0859 code vary from purely traction-related concerns to a failure of the transmission system. Traction problems are most commonly reported, particularly if a P0859 code-afflicted car is driven on slippery surfaces. Harsh or failed shifting may also come alongside a P0859 code. The P0859 trouble code and dashboard trouble indicator will both be activated for the sake of highlighting and diagnosing the concern.

How does a mechanic diagnose the P0859 code?

A technician may first diagnose the P0859 code by reading it via an OBD-II code reader. Components related to the traction system (particularly the traction control system's activation switch) should be inspected and tested for signs of fault or malfunction. All wires relating to the traction control system should be inspected thoroughly in order to verify any potential signs of corrosion, damage, wear or disconnection. In the case that there is a possible issue with one of the vehicle's control modules, a specialized scanner (such as an Autohex) may be used in order to pinpoint the source of the problem.

Common mistakes when diagnosing the P0859 code

Although a faulty traction control module is sometimes to blame for a P0859 code, it is often mistakenly replaced when the real problem lies with broken electrical circuitry or a faulty switch.

How serious is the P0859 code?

A P0859 trouble code can result in drivability issues for the vehicle. Particularly if the vehicle's typical driving surfaces are slippery, a P0859 code can make the vehicle more dangerous to drive. In addition, an unpredictable transmission system resulting from a P0859 can make driving the vehicle a precarious situation.

What repairs can fix the P0859 code?

Additional comments for consideration regarding the P0859 code

The P0859 trouble code only applies to vehicles with electronic traction control systems. Due to the high amount of circuitry associated with this code and the traction system, it is recommended that these repairs be left to a proper technical specialist.

Need help with a P0859 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
Check Engine Light
P0859

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0859 code.

SCHEDULE P0859 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

5,079

Rating Summary
4,679
195
48
27
130
4,679
195
48
27
130

Robert

39 years of experience
15 reviews
Robert
39 years of experience
Jaguar S-Type - Check Engine Light is on - Scottsdale, Arizona
Bob is very thorough and an all-around professional. I'll be booking his service for both my cars as often as work is needed.

Eduardo

18 years of experience
353 reviews
Eduardo
18 years of experience
Dodge Dakota - Check Engine Light is on - Stafford, Texas
Great guy very knowledgeable and very professional one of the best mechanics I've ever met. He explained what was going on and let me know my options. Will be asking for him again!

Michael

15 years of experience
524 reviews
Michael
15 years of experience
Toyota Corolla - Check Engine Light is on - Atlanta, Georgia
Michael was a great mechanic, and nice guy. He was knowledgeable and offered examples of my current problems while also sharing solutions.

Juan

8 years of experience
53 reviews
Juan
8 years of experience
Honda Pilot - Check Engine Light is on - Chapel Hill, North Carolina
Great job, explained the situation to me and told me to try to get the dealer to repair it under warranty. I certainly will but if they give me a song and dance I will be back and have Juan do it in a heartbeat. I’m well pleased.


More related articles

P0361 OBD-II Trouble Code: Ignition Coil K Primary / Secondary Circuit Malfunction
Trouble code P0361 means that a malfunction in an ignition coil, often due to an open or short in the driver circuit.
P2504 OBD-II Trouble Code: Charging System Voltage High
P2504 P2504 code definition The P2504 OBD-II fault code simply means that an irregularity was detected in the charging system circuit - specifically that the voltage was high. This high voltage reading may have originated from the battery, charging system,...
P0710 OBD-II Trouble Code: Transmission Fluid Temperature Sensor Circuit Malfunction
P0710 means that your transmission is overheating, or that the sensor is faulty. This could be due to leaking, low, or dirty fluid, or a bad sensor.

Related questions

Multiple new problems after collision repair

When there are problems that were not there before an accident that show up after repairs are done, then the problems may have been due to the last repairs. However, you know best if any of the problems are new....

Car is reading trouble code PO136 01/01

Hi. There could be a couple of things going on here. There are multiple oxygen sensors on your car and sometimes what we think bank 1 is may not be and the wrong oxygen sensor is replaced giving us the...

The RPM is racing up and down when in park. Dashboard lights come on one at a time and then the car runs badly

Hi there. I understand your situation and concern. Fist we need the codes that are stored when the Check Engine Light comes on. Any diagnostic scan tool should be able to give us the codes that are set and give...

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.

1-800-701-6230 · hi@yourmechanic.com