TCM Power Relay Control Circuit High
The P0887 code means the vehicle's onboard diagnostic system has detected: TCM Power Relay Control Circuit High. 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.
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What Are the Symptoms of P0887?
- Check Engine Light on
- TCM power relay circuit shorted high
- Transmission in limp mode
- Erratic transmission behavior
What Causes P0887? (Most Likely First)
- Short to power in TCM power relay circuit Very High
- Corroded or damaged wiring connections High
- Low battery voltage affecting TCM operation Moderate
- TCM internal circuit failure Low
Can I Still Drive with P0887?
No — stop driving. P0887 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
What does P0887 indicate?
P0887 indicates a problem with the tcm power relay control circuit high. 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
How Do You Diagnose P0887?
-
Use a scan tool to read TCM Power Relay Control data
-
Check TCM power supply and ground connections for proper voltage and continuity
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Inspect TCM relay and related fuses
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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
Which Vehicles Commonly Get P0887?
- 2010-2020 Ford F-150
- 2012-2019 Chevrolet Silverado
- 2011-2020 Toyota Camry
- 2009-2019 Honda Accord
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