Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent
What it means
P0844 means the transmission fluid pressure sensor "A" signal is dropping out intermittently. The engine starts and runs normally, but because the transmission uses this reading to time its shifts, you may get occasional harsh or erratic shifting and brief limp-mode events. Intermittent faults like this usually trace back to loose or chafed wiring rather than a dead sensor.
Can I keep driving? The engine starts and runs; the car is drivable, but shifting may be erratic and the transmission can briefly drop into limp mode — the intermittent nature means the fault comes and goes.
Common symptoms
What you'll notice
- Check-engine light on (sometimes intermittent)
- Erratic or harsh shifting that comes and goes
- Transmission may briefly enter limp mode
- Reduced power while in limp mode
Common causes
Most likely first
- Intermittent wiring or connector fault at the pressure sensor (most common for an intermittent code)Likely
- Loose or corroded electrical connectionsCommon
- Failing transmission fluid pressure sensor/switch ACommon
- Low or dirty transmission fluidLess often
- Failed transmission control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data, then wiggle-test the sensor connector and harness to reproduce the dropout.
- Inspect and clean or repair connectors and grounds in the circuit.
- Check transmission fluid level and condition.
- Test the sensor and its circuit; replace the sensor if it is the fault.
- If the fault stays elusive, diagnose the harness and TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0844?+
Can I just clear P0844?+
Related codes
Often seen with P0844
Read & clear P0844 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.