P083BTransmission Fluid Pressure Sensor/Switch G Circuit Range/Performance
- 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 G is one of up to eight pressure inputs (A to H) that SAE J2012 provides for automatic gearboxes. No maker could be found that uses the letter G: GM's tables up to 2025, Ford's summaries and Allison stop at A to E. The description therefore follows the general rule for gearbox inputs in California's OBD regulation, which demands circuit and plausibility checks, and the logic of the A and B codes. P083B means the signal is electrically valid but implausible: a switch does not follow the valve or clutch command, or a sensor deviates from target or from a partner sensor, as GM's CVT checks on A and B.
- 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
- LikelyDirty or worn valve body, sticking valve
- LikelyPressure sensor or switch drifting
- PossibleMechanical damage: CVT belt or pulleys, pump, clutch
- PossibleFluid level low or fluid aged
- RareControl module software thresholds
- 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: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.