Transmission Fluid Pressure Sensor/Switch 'B' Circuit Range/Performance Problem
Indicates an issue with the transmission fluid pressure sensor circuit B.
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What it means (plain English)
The computer monitors the pressure of the transmission fluid to keep it working properly, and it’s not getting the correct signal from the sensor, meaning it could be too high or too low when compared to what it expects.
What the computer is actually seeing
The transmission control module (TCM) checks the voltage from the fluid pressure sensor. This should usually read between 0.5 to 4.5 volts, corresponding with the fluid pressure values it expects.
What a healthy reading looks like
Expect 0.5-4.5 volts at the transmission fluid pressure sensor for normal operation. Actual fluid pressure should typically be around 10-40 psi depending on conditions.
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 for visual damage to wiring and connectors related to the transmission fluid pressure sensor.
- 2Check transmission fluid level; it should be at the recommended level (usually between the 'Add' and 'Full' marks on the dipstick).
- 3Measure voltage at the transmission fluid pressure sensor. Should be between 0.5-4.5 volts. If not, further inspect wiring and connectors.
- 4If voltage is correct, use a scan tool to read sensor data and compare actual pressure with TCM expectations during operation. If the readings are erratic or out of expected range, replace the sensor.
- 5If the new sensor doesn’t solve the issue, consider evaluating the TCM and its software for faults.
Common causes
- Faulty transmission fluid pressure sensor
- Wiring issues in the sensor circuit
- Low transmission fluid level
- Faulty transmission control module
- Bad connector or terminals at the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but you may experience shifting issues; fix soon to avoid further damage.
Will the code come back if I reset it?
If the underlying issue isn't fixed, expect it to return after driving for a bit.
Why does this code pair with others?
These codes often involve multiple sensors or system failures related to transmission pressure.
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