Transmission Fluid Temperature Sensor A Circuit High
The transmission fluid temperature sensor's circuit is reading too high.
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What it means (plain English)
The temperature sensor for your transmission fluid is sending a signal that indicates the fluid is hotter than it should be, which can lead to overheating and damage.
What the computer is actually seeing
The computer sees a signal voltage above the normal operating range, typically above 4.5 volts when it should be between 0.5 to 4.5 volts under normal conditions.
What a healthy reading looks like
0.5 to 4.5 volts for normal operation; above 4.5 volts indicates a 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.
- 1Check the transmission fluid level; it should be within the specified range. If it's low, refill and retest.
- 2Inspect the wiring and connectors for damage or corrosion. Repair any issues found.
- 3With the engine running and in park, measure the voltage at the transmission fluid temperature sensor. It should be between 0.5 to 4.5 volts.
- 4If voltage is above 4.5 volts, replace the transmission fluid temperature sensor and retest. If still out of range, check for issues in the wiring harness.
- 5If all else is good, consider checking the ECU for fault codes and possible updates.
Common causes
- Faulty transmission fluid temperature sensor
- Open or shorted wiring in the sensor circuit
- Poor connection at the sensor or ECU
- Contaminated transmission fluid
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe, meaning you should fix it soon to avoid overheating issues but you can drive it for a short time if necessary.
Will this code come back after clearing it?
If the underlying issue is not fixed, the code will likely return.
Why is this code paired with others?
It's common to see related codes when multiple sensor issues are present or if there is a problem with the transmission system.
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