P0890 OBD-II Trouble Code: Traction Control Module (TCM) Power Relay Sense Circuit Low

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0890 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0890 code

P0890 is a diagnostic trouble code (DTC) for "Traction Control Module (TCM) Power Relay Sense Circuit Low". 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0890 DIAGNOSTIC Get a fair and transparent estimate upfront

diagnostic check engine light

P0890 code definition

Applying only to vehicles with a traction control system, a P0890 trouble code indicates a fault in the traction control module communication circuit. The traction control module communication circuit relays information to the Powertrain Control Module (PCM) that helps the vehicle computer decide on how much fuel and RPMs the vehicle engine needs depending on current driving conditions and factors. The traction control module communication circuit also helps with engine timing and other things while the vehicle is in operation. Some similar trouble codes include P0880, P0881, P0882, P0883, P0884, P0885, P0886, P0887, P0888, P0889, P0891, and P0892 codes.

What the P0890 code means

When the PCM or other control modules do not receive the necessary data from the traction control module communication circuit, a P0890 trouble code is stored and the Check Engine light may illuminate, in addition to the traction control malfunction light illuminating. The PCM might also place the vehicle transmission into Limp-in mode.

What causes the P0890 code?

A defective traction control ON/OFF switch is the most common cause of a P0890 trouble code, with liquid spilled into the switch being the most likely culprit behind the failure. Some other causes include shorted, corroded, and damaged wiring or connectors, as well as corrosion in the sensor connector.

What are the symptoms of the P0890 code?

In addition to a stored code and illuminated Check Engine and Traction Control Malfunction lights, some other symptoms of a P0890 trouble code include a lack of traction while driving in slippery conditions and failure of the traction control system. Other symptoms include harsh shifting or failure to shift by the transmission, as well as a reduction in the fuel efficiency of the vehicle.

How does a mechanic diagnose the P0890 code?

To properly diagnose a P0890 trouble code, a mechanic needs an advanced scanner, digital volt/ohmmeter, a specialized scanner for diagnosing the pins of the Controller Area Network (CAN) Bus harness, auxiliary ground cable, and a CAN Bus system wiring diagram. The mechanic must also perform the following steps when diagnosing:

  • Inspect and check the wiring and connectors for damage or fault.
  • Clear the trouble code and test the system to see if it returns.
  • The mechanic should also download all stored codes and any flash frame data.
  • If the code returns, the mechanic needs to use a specialized scanner to test the pin values of the CAN Bus Harness, comparing their findings with the manufacturer's specifications.
  • When inspecting and testing the CAN Bus system pins, the mechanic should use both a CAN Bus system wiring diagram and an auxiliary ground cable to make the process easier.
  • The mechanic should also check the continuity of the ground circuits of the various related control modules using the digital volt/ohmmeter.
  • Clear the code and retest the system to see if the trouble code returns.

Common mistakes when diagnosing the P0890 code

When diagnosing a P0890 trouble code, mechanics often make the mistake of citing the traction control module as the problem instead a faulty switch, wiring, or connector, which is actually at fault. This results in the problem remaining unfixed and the trouble code returning.

How serious is the P0890 code?

A P0890 trouble code needs to be dealt with as soon as possible. The resulting symptoms make the vehicle difficult to drive at best. Some of the problems associated with a P0890 trouble code include loss of traction, failure of the transmission to shift properly, and worsening fuel mileage.

What repairs can fix the P0890 code?

Repairing a P0890 trouble code requires a mechanic to do the following:

Need help with a P0890 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
P0890

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0890 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,203

Rating Summary
2,919
140
39
22
83
2,919
140
39
22
83

Nathan

26 years of experience
198 reviews
Nathan
26 years of experience
Nathan was knowledgeable about my car and very educational as well. He explained everything he was doing and why. I admire his attention to detail. He really showed genuine interest and attentiveness to the problem. He’s a great conversationalist and was easy to work with.
2013 CHEVROLET CRUZE - CHECK ENGINE LIGHT IS ON - GLENPOOL, OKLAHOMA

Mack

19 years of experience
72 reviews
Mack
19 years of experience
Very nice and knew what he was doing. Got what I needed done even though was told wrong by the office.
1999 FORD F-150 - CHECK ENGINE LIGHT IS ON - MIDLOTHIAN, TEXAS

Scott

31 years of experience
24 reviews
Scott
31 years of experience
Very nice friendly mechanic. Very helpful with with questions that I had. Offered good advice. He explained some of the problems to me and what should be the next to resolve it before spending unnecessary monies. This was my first time using him and will not be my last. I would recommend him to anyone. Especially women because he does not seem to take advantage of our knowledge of not knowing things about cars.
2001 HYUNDAI ELANTRA - CHECK ENGINE LIGHT IS ON - PARKVILLE, MARYLAND

Tyrone

6 years of experience
61 reviews
Tyrone
6 years of experience
He showed up on time and got my diagnostic done quickly. He also gave me honest recommendations on what I need to do for my car.
2008 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - CULVER CITY, CALIFORNIA

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....

Related questions

Q: My Check Engine Light turns on and off, and the Service Traction Light is on

There are several components that can cause these types of symptoms. Issues that cause poor performance and shaking can be fuel, air, spark, electronic, or mechanical problems. The good news is that the Check Engine Light has come on. This...

Q: Check engine light and P0139 code on a 2006 Hyundai Coupe

You've got to realize that those things often pretty much weld themselves in. From the difference in the metal and the sensor, and the metal and the exhaust. I use special sockets that fit on them, which anybody can buy....

Q: Will a bad O2 sensor damage my car's computer?

The engine control unit (ECU) is a possible cause of the O2 sensor fault codes but not the most likely. Your vehicle is equipped with 4 O2 sensors. Bank 1 is the driver's side. Bank 2 is the passenger side....

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