Transmission Fluid Temperature Sensor 1
Transmission fluid temperature sensor is reading out of range.
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What it means (plain English)
The transmission fluid temperature sensor is either sensing too high or too low a temperature, which affects how the transmission operates.
What the computer is actually seeing
The Transmission Control Module (TCM) monitors the fluid temperature and aims for a range of 160°F to 200°F (71°C to 93°C). When the reading is below 90°F (32°C) or above 250°F (121°C), it triggers the fault code.
What a healthy reading looks like
Expected transmission fluid temp is typically between 160°F and 200°F (71°C - 93°C).
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 fluid level using the dipstick; it should be within the safe range. Decision: If fluid is low, top it off and retest. If fluid is at proper level, proceed to step 2.
- 22. Inspect wiring and connector for the transmission fluid temperature sensor. Look for frays, corrosion, or loose connections. Decision: If defects are found, repair or replace as needed, then retest. If wiring is good, proceed to step 3.
- 33. Use a scan tool to monitor the actual temperature reading of the transmission fluid compared to the expected range. Decision: If readings are out of spec, replace the transmission fluid temperature sensor. If within spec, proceed to step 4.
- 44. Check for any TCM updates or known issues. If none, consider replacing the TCM.
Common causes
- Wiring issue between the sensor and the TCM
- Faulty transmission fluid temperature sensor
- Low transmission fluid level
- High transmission fluid contamination
- Faulty TCM software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's usually drivable, but shifting may be affected and overheating could occur, so fix soon.
If I clear the code, will it come back?
If the underlying issue isn't fixed (e.g., faulty sensor or wiring), yes, it will return.
Why do I see this code with SPN 0710 or SPN 0711?
These codes often appear together due to related sensor faults or issues with the transmission temperature readings.
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