P0845: Transmission Fluid Pressure Sensor/Switch B Circuit
MediumPowertrainTransmission
What does P0845 mean?
P0845 is a diagnostic trouble code indicating "Transmission Fluid Pressure Sensor/Switch B Circuit". A sensor in the transmission is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Harsh or delayed gear shifts
- Transmission slipping
- Vehicle stuck in one gear (limp mode)
- Intermittent warning lights
Estimated repair cost
Typical range in Australia (parts + labour)
$300 – $3000 AUD
Common causes
- Low or degraded transmission fluid
- Worn clutch packs or bands
- Faulty shift solenoid
- Wiring issue to the transmission control module
- Failing torque converter
What should you do?
Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.
Get a diagnosis for YOUR car
Code P0845 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.