TCM Power Relay Sense Circuit Range/Performance
The P0889 code means the vehicle's onboard diagnostic system has detected: TCM Power Relay Sense Circuit Range/Performance. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $100 - $1,500 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Relay sense reading inconsistent
- Transmission in limp mode
- Erratic transmission behavior
Probable Causes (Ranked by Likelihood)
- TCM relay sense signal out of expected range Very High
- Corroded or damaged wiring connections High
- Low battery voltage affecting TCM operation Moderate
- TCM internal circuit failure Low
Frequently Asked Questions
What does P0889 indicate?
P0889 indicates a problem with the tcm power relay sense circuit range/performance. This is a critical issue that can prevent the transmission from operating correctly.
Can a weak battery cause this code?
Yes. TCM modules are sensitive to voltage supply quality. A weak battery, poor connections, or charging system issues can cause various TCM power-related codes. Always test the battery and charging system first.
Do I need a TCM replacement?
Not necessarily. Most TCM codes are caused by external issues like power supply problems, relay failures, or wiring faults. A TCM replacement is typically only needed when all external causes have been ruled out.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Use a scan tool to read TCM Power Relay Sense data
-
Check TCM power supply and ground connections for proper voltage and continuity
-
Inspect TCM relay and related fuses
-
Verify battery and charging system health with a multimeter
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2010-2020 Ford F-150
- 2012-2019 Chevrolet Silverado
- 2011-2020 Toyota Camry
- 2009-2019 Honda Accord
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.