Transmission Oil Temperature
Indicates the temperature of the transmission oil is out of range.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The transmission computer monitors the temperature of the transmission fluid. If the oil gets too hot (around 220°F or higher), it can damage the transmission. If it’s too cold (below 100°F), it can cause poor shifting and performance.
What the computer is actually seeing
The engine control module (ECM) measures the resistance from the transmission temperature sensor. At 200°F, the sensor should show around 1.8k ohms. If it sees a voltage drop or a resistance outside the expected range, the code will set.
What a healthy reading looks like
Transmission temperature should typically range between 160°F and 200°F during normal operation.
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 the transmission fluid level — ensure it is within the proper range.
- 22. Inspect the wiring and connectors to the transmission temperature sensor for damage or corrosion.
- 33. Use a scan tool to monitor the live data from the transmission temperature sensor — compare the reading against the expected values. If it’s out of range, proceed to step 4.
- 44. Disconnect the transmission temperature sensor and measure the resistance with a multimeter. It should be around 1.8k ohms at 200°F. If readings are not within specs, replace the sensor. If it's fine, continue to step 5.
- 55. Check for any transmission fluid leaks or overheating issues and ensure the fluid is not burnt or contaminated.
Common causes
- Faulty transmission temperature sensor
- Wiring issues in the sensor circuit
- Low transmission fluid level or quality issues
- Faulty transmission control module (TCM)
- Overheating due to heavy load or towing.
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive but should address the issue soon to avoid potential transmission damage.
Will this code come back after repair?
If the problem is fixed correctly, the code should not return; monitor the system after repair.
Why does it pair with SPN 2002?
SPN 2002 often indicates the sensor is malfunctioning, which could explain multiple transmission temperature issues.
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