TCM Power Relay Sense Circuit Intermittent
The P0892 code indicates that the Transmission Control Module (TCM) has detected an intermittent or unexpected voltage condition in the power relay sense circuit. This circuit monitors the voltage supplied to the TCM from the transmission control relay. An intermittent fault can be caused by a failing relay, corroded wiring, loose connections, or a faulty TCM. This issue can lead to erratic transmission behavior or no-start conditions.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission shifting erratically or stuck in gear
- Vehicle may not start or stall intermittently
- Transmission warning light on
2. Most Common Causes
- Faulty transmission control relay
- Corroded or damaged wiring/connectors in the relay sense circuit
- Loose or intermittent electrical connections
- Faulty TCM (less common)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and document freeze frame data.
Step 2: Visually inspect the transmission control relay and its wiring for corrosion, damage, or loose connections.
Step 3: Test the relay and circuit continuity with a multimeter; check for intermittent voltage drops.
Step 4: If wiring and relay are good, test the TCM power and ground circuits; consider TCM replacement if all else fails.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause sudden transmission failure or stalling, leading to a safety hazard.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for relay and wiring repairs; TCM replacement can cost $500-$1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.