Transmission Oil Temperature Sensor 2 High
The transmission oil temperature sensor 2 is reporting a high temperature.
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What it means (plain English)
The transmission has a temperature sensor that measures how hot the transmission fluid is. If this sensor reads too high, it means your transmission fluid is running excessively hot, which can cause damage over time.
What the computer is actually seeing
The engine control module (ECM) receives an input voltage signal from the transmission oil temperature sensor, typically ranging from 0.5V (cold) to 4.5V (hot). A reading above 4.0V indicates a potential high temperature condition.
What a healthy reading looks like
Normal transmission fluid temperature should be between 80°C to 100°C (176°F to 212°F). Values above 100°C (212°F) signal a problem, while values above 4.0V can trigger this fault.
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's within the recommended range. Decision: If low, add fluid and retest. If normal, proceed to step 2.
- 22. Inspect the wiring and connectors leading to the transmission oil temperature sensor for damage or corrosion. Decision: If found, repair/replace. If okay, continue to step 3.
- 33. Test the transmission oil temperature sensor using a multimeter. Expected resistance is typically around 2-3k ohms at 80°C (176°F). Decision: If resistance is outside the normal range, replace the sensor. If within range, proceed to step 4.
- 44. Use a scan tool to check transmission fluid temperature readings. Compare with actual fluid temperature. Decision: If the readings are inconsistent, replace the sensor. If consistent but high, investigate other causes like cooling issues.
Common causes
- Faulty transmission oil temperature sensor
- Wiring issues (shorts, opens, corrosion)
- Blocked transmission cooler or lines
- Low transmission fluid levels
- High external temperatures or overloading conditions
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
While the vehicle may still drive, it's not advisable due to the risk of overheating and transmission damage.
Will the code come back after repairs?
If the root cause is fixed, the code should not return unless another issue arises.
Why does this code appear with SPN 1697?
SPN 1697 is related to the same sensor but indicates a different fault, often showing that there's a problem with sensor circuit continuity.
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