Transmission Fluid Temperature Sensor Out of Range - High
High temperature reading from the transmission fluid temperature sensor.
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What it means (plain English)
The transmission fluid temperature sensor is sending a signal that the fluid is getting too hot, which could mean there's an issue with fluid circulation or cooling.
What the computer is actually seeing
The computer monitors the transmission fluid temperature. If it reads above the expected thresholds, it flags a fault. This reading is in ohms, and it should normally be between 1,500 to 2,500 ohms at around 70°C (158°F).
What a healthy reading looks like
Transmission fluid temperature should be between 70°C to 90°C (158°F to 194°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. Should be in the acceptable range; top off if low. Decision: If fluid is low, refill and retest. If still present, move to step 2.
- 22. Inspect the wiring and connector to the transmission fluid temperature sensor. Look for damage, corrosion, or loose connections. Decision: If there's a wiring issue, repair and retest. If no issues, proceed to step 3.
- 33. Test the transmission fluid temperature sensor using a multimeter. Expected resistance is between 1,500 to 2,500 ohms at 70°C (158°F). Decision: If sensor reads out of spec, replace it. If it's within spec, move to step 4.
- 44. Check for blockages in the transmission cooler lines. Ensure that coolant flow is not restricted. Decision: If blockage is found, clear it and retest. If no blockage, consider further diagnostic steps. Don't forget transmission integrity checks.
Common causes
- Low transmission fluid
- Faulty transmission fluid temperature sensor
- Blocked transmission cooler
- Wiring or connector issues leading to shorts or opens
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; not immediately dangerous but recommend fixing soon to prevent transmission damage.
Will this code come back after clearing it?
Yes, if the underlying issue isn't resolved, the code will likely return.
Why does this code sometimes pair with SPN 1762?
SPN 1762 indicates low fluid temperature, which can happen when the sensor is faulty or has wiring issues, leading to conflicting readings.
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