Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the power going to the part of the car that controls the gears. It's like when a toy doesn't work because the batteries aren't in right.
The TCM (Transmission Control Module) relies on a power relay to function correctly. This code indicates that the power relay sense circuit is not operating within its expected range or performance.
The TCM Power Relay Sense Circuit is responsible for monitoring the power supply to the Transmission Control Module. If the circuit's performance is outside the expected range, it could affect the TCM's ability to manage the transmission effectively. This could be due to issues with the relay, wiring, or the TCM itself.
• Check Engine Light is on
• Transmission may not shift properly
• Vehicle may enter limp mode
• Faulty TCM power relay
• Damaged wiring or connectors
• Faulty Transmission Control Module
TCM: Transmission Control Module
Relay: An electrical switch that opens and closes under the control of another electrical circuit
• Check for any other related trouble codes.
• Inspect the TCM power relay for proper operation.
• Examine wiring and connectors for damage or corrosion.
• Replace the TCM power relay if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the Transmission Control Module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $500
Moderate
• Chrysler 300
• Dodge Charger
• Jeep Grand Cherokee
• Regularly inspect and maintain vehicle wiring.
• Ensure connectors are clean and secure.
• Replace worn or faulty relays promptly.
Electrical Circuit Issue
• Avoid driving the vehicle if transmission issues are severe.
• Consult a professional mechanic for accurate diagnosis.
• Regular maintenance can prevent such issues.
Check with the vehicle manufacturer for warranty coverage on electrical components.
This code has been associated with issues in vehicles with complex electronic transmission systems.
Moderate – Address the issue soon to avoid potential transmission damage.
Ignoring this code could lead to transmission failure, which may pose safety risks.
• Vehicle at operating temperature
• Transmission in normal operation mode
The TCM power relay is typically located in the fuse box or relay panel under the hood.
Q: Can I drive with a P0889 code?
A: It's not recommended as it can lead to transmission issues.
Q: How do I clear a P0889 code?
A: Fix the underlying issue, then use an OBD-II scanner to clear the code.
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