AutoCodes – Generic – P0889

P0889 Code - TCM Power Relay Sense Circuit Range/Performance

Quick Answer

The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. Common causes include Faulty Transmission Control Module (TCM) Power Relay, Transmission Control Module (TCM) Power Relay harness is open or shorted, Transmission Control Module (TCM) Power Relay 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: P0889 indicates TCM Power Relay Sense Circuit Range/Performance.
Common causes: Common causes include Faulty Transmission Control Module (TCM) Power Relay, Transmission Control Module (TCM) Power Relay harness is open or shorted, Transmission Control Module (TCM) Power Relay 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.

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Code Popularity 9,577

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0889 Description

The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the Powertrain Control Module (PCM). It is referred to as the Transmission Control Relay Output circuit or switched battery.
Immediately after a controller reset (ignition key turned to the run position or after cranking engine), the PCM verifies that the relay contacts are open by checking for no voltage at the switched battery terminals. After this is verified, the voltage at the pressure switches is checked. There should be no voltage on the pressure switches at this time. The PCM will then activate the relay.

OBDII Code P0889 - TCM Power Relay Sense Circuit Range/Performance - AutoCodes.com — P0889 Code - TCM Power Relay Sense Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0889?

Faulty Transmission Control Module (TCM) Power Relay
Transmission Control Module (TCM) Power Relay harness is open or shorted
Transmission Control Module (TCM) Power Relay circuit poor electrical connection

How to Fix the DTC P0889?

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 P0889 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 P0889 code?

Need more information on how to fix the P0889 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0889 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0889 Dodge — TCM Power Relay Sense Circuit Range/Performance

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 P0889 Code

1. What does the OBDII code P0889 mean?

P0889 indicates an issue with the TCM (Transmission Control Module) Power Relay Sense Circuit, specifically that its range or performance is outside the expected parameters.

2. What are the common symptoms of code P0889?

Symptoms can include transmission shifting issues, the vehicle going into limp mode, illuminated check engine light, or reduced fuel efficiency.

3. What causes the P0889 code to appear?

Common causes include a faulty TCM power relay, damaged wiring or connectors in the relay circuit, a malfunctioning TCM, or issues with the vehicleâ€™s battery or charging system.

4. Can a weak battery cause the P0889 code?

Yes, a weak or failing battery can cause voltage irregularities that may trigger the P0889 code.

5. How is the P0889 code diagnosed?

A mechanic will typically check for wiring and connector issues, test the TCM power relay for proper operation, and verify power supply and ground connections to the TCM.

6. Can I drive with the P0889 code?

Driving with this code is not recommended, as it can lead to unpredictable transmission behavior or cause further damage to the transmission system.

7. How can I fix the P0889 code?

Repairs may involve replacing the TCM power relay, repairing damaged wiring or connectors, or, in rare cases, replacing the TCM itself.

8. What tools are needed to fix the P0889 code?

You may need an OBDII scanner, digital multimeter, wiring diagrams, and basic hand tools to diagnose and repair the issue.

9. Is the P0889 code expensive to fix?

The cost depends on the root cause. Replacing a TCM power relay or fixing wiring is relatively inexpensive, but TCM replacement can be costly.

10. Can a software update resolve the P0889 code?

In some cases, a software update for the TCM may address the issue if itâ€™s related to a known software glitch. Consult your dealer or repair shop for details.