Transmission Fluid Pressure Sensor Circuit
Transmission fluid pressure sensor circuit is out of range.
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What it means (plain English)
The transmission fluid pressure sensor measures the hydraulic pressure in the transmission. If the voltage signal (0.5 to 4.5 volts) from the sensor is too low or too high, the computer sees it as a problem.
What the computer is actually seeing
The computer monitors the voltage from the transmission fluid pressure sensor and expects it to be between 0.5 and 4.5 volts, indicating normal pressure levels.
What a healthy reading looks like
Voltage levels from the sensor should be between 0.5V and 4.5V, corresponding to 60-200 PSI of fluid pressure depending on the vehicle.
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 transmission fluid level; it should be at the full mark on the dipstick. Correct fluid level if low.
- 2Inspect the wiring and connectors to the transmission fluid pressure sensor for damage, corrosion, or loose connections.
- 3Using a multimeter, measure the voltage at the transmission fluid pressure sensor. It should be between 0.5V and 4.5V with ignition on, engine off. If it’s outside this range, next step.
- 4If voltage is out of range, disconnect the sensor and check for continuity from the sensor connector to the TCM harness. Repair any broken wires found.
- 5If wiring is good and sensor voltage is still incorrect, replace the transmission fluid pressure sensor.
Common causes
- Faulty transmission fluid pressure sensor
- Wiring issues like shorts or opens in the sensor circuit
- Low transmission fluid
- Faulty transmission control module (TCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but fix it soon; issues may worsen over time and affect transmission performance.
Will this code come back after repair?
If the issue is fixed correctly (wiring and sensor), it shouldn't come back.
Why does SPN 0745 pair with other codes?
Transmission issues often have multiple related faults like pressure sensor, solenoid problems, or low fluid that affect performance.
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