Transmission Fluid Temperature Sensor Circuit Range/Performance Problem
There's an issue with the transmission fluid temperature sensor readings.
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 fluid temperature sensor is supposed to send info to the engine control unit (ECU) about how hot the fluid is. If it's reading too high, too low, or just wrong, you might have a problem with the sensor or the wiring.
What the computer is actually seeing
The ECU expects the transmission fluid temperature to fall within a specific range, typically between 150°F and 200°F (65°C to 93°C) when the vehicle is operating normally.
What a healthy reading looks like
Transmission fluid temp should read between 150°F (65°C) - 200°F (93°C) when warmed up; open circuit or shorts can skew readings.
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 between the minimum and maximum marks on the dipstick.
- 2Inspect wiring and connectors to the transmission fluid temperature sensor for damage or corrosion. Repair as needed.
- 3Using a scan tool, check the temperature readings from the sensor. Compare against expected values (150°F - 200°F).
- 4Test the resistance of the transmission fluid temperature sensor. It should be within specifications from the service manual. If it's out of spec, replace the sensor.
- 5If the sensor checks out, monitor the temperature with a scan tool during operation. If readings are erratic, consider checking the ECU.
Common causes
- Faulty transmission fluid temperature sensor
- Damaged wiring or connectors to the sensor
- Open circuit or short in the sensor wiring
- Low transmission fluid levels
- Faulty engine control unit (ECU)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe; it impacts transmission performance and shifting, so drive with caution and address soon.
Will the code come back after I clear it?
If the underlying issue isn't resolved, the code will likely return after driving for a while.
Why do I see a pairing with P0718?
P0718 is often triggered alongside P0717 when both the sensor and circuit performance are in question.
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