Transmission Oil Temperature Sensor Voltage High
Transmission oil temperature sensor voltage is above normal range.
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What it means (plain English)
The computer is seeing a higher voltage from the transmission oil temperature sensor than it expects, which usually means the sensor is faulty or there's a wiring issue.
What the computer is actually seeing
The Engine Control Module (ECM) expects a voltage signal between 0.5V and 4.5V from the transmission oil temperature sensor based on engine operating conditions.
What a healthy reading looks like
Normal sensor voltage should range from 0.5V (cold) to about 4.5V (hot, around 200°F).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check transmission oil level; ensure it’s within the normal range.
- 22. Inspect the wiring and connectors to the transmission oil temperature sensor for damage or corrosion; repair as necessary.
- 33. Use a multimeter to test the voltage at the sensor connector. Is it above 4.5V? Yes: Go to step 5. No: Go to step 4.
- 44. Replace the transmission oil temperature sensor. Clear codes and retest vehicle. Did code return? Yes: Go to step 5. No: Repair complete.
- 55. Check for a short circuit or poor grounding in the wiring harness. Repair if necessary. Retest after repairs.
Common causes
- Faulty transmission oil temperature sensor
- Shorted or open circuit in wiring
- Corroded connectors
- Excessive heat causing sensor malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 6413 active?
Moderate severity means it’s best to address it soon to avoid possible transmission overheating.
Will this code come back after clearing it?
If the underlying issue is not fixed, yes, it’s likely to come back.
Why does this code pair with SPN 6411?
SPN 6411 relates to low transmission oil temperature, so both can point to sensor or wiring issues.
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