P084CTransmission Fluid Pressure Sensor/Switch H Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Transmission fluid pressure sensor/switch H is the last of up to eight pressure inputs (A to H) in SAE J2012; the letter is the maker's choice. Documented uses are rare: Mitsubishi sets P084A on its Jatco CVT8 (F1CJC/W1CJC) and Ford P084B on the 2020–23 Explorer 3.3 full hybrid. For P084C no maker is documented. It means the signal is too low: a switch closed although no pressure is expected, a sensor below its lower limit through a short to ground or missing 5 V supply, judged like A and B under California's rule for gearbox inputs.
- What you may notice
- Check engine or transmission warning lamp on
- Limp mode with substitute gear or limited ratio
- Harsh or delayed shifts
- Likely causes
- LikelySignal wire shorted to ground, or open on duty-cycle sensors
- LikelySensor faulty or switch stuck closed
- Possible5 V supply missing
- PossibleValve stuck applied, so the switch reports pressure correctly
- RareControl module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €120 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.