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Engine-Codes – Generic – P0890

P0890 Code - TCM Power Relay Sense Circuit Low

Quick Answer

The P0890 code indicates a problem with the Transmission Control Module (TCM) Power Relay Sense Circuit. Common causes include Faulty TCM power relay, Wiring issues in the power relay sense circuit, Corrosion or poor connections in the circuit. 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
P0890 indicates TCM Power Relay Sense Circuit Low.
Common causes
Common causes include Faulty TCM power relay, Wiring issues in the power relay sense circuit, Corrosion or poor connections in the circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0890 Description

The P0890 code indicates a problem with the Transmission Control Module (TCM) Power Relay Sense Circuit. The TCM is responsible for controlling the transmission functions in the vehicle, such as shift points, torque converter lockup, and more. The power relay sense circuit is designed to monitor the voltage level of the power supply to the TCM. When the voltage level is too low, it triggers the P0890 code.

OBDII Code P0890 - TCM Power Relay Sense Circuit Low
P0890 Code - TCM Power Relay Sense Circuit Low

Common Causes of P0890

  1. Faulty TCM power relay
  2. Wiring issues in the power relay sense circuit
  3. Corrosion or poor connections in the circuit
  4. Low battery voltage affecting the TCM
  5. TCM internal fault

Symptoms of P0890

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Transmission not shifting
  4. Limp mode activation
  5. Check Engine Light illuminated

How to Fix P0890

  1. Begin by checking the power relay and its connections for any signs of damage or corrosion.
  2. Test the power relay with a multimeter to ensure it is functioning properly.
  3. Inspect the wiring in the power relay sense circuit for any breaks or damage.
  4. Test the battery voltage to ensure it is within the proper range for the TCM.
  5. If necessary, replace the TCM if internal faults are detected.

Cost to Fix P0890

The typical repair cost for addressing a P0890 code can range from $150 to $400, depending on the extent of the issue and the parts needed for replacement. Keep in mind that labor rates can vary, so it's recommended to check with local auto repair shops for a more accurate estimate.

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Code P0890 Information for Specific Makes

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.

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