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.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Check engine or transmission warning lamp on
- Limp mode with substitute gear or limited ratio
- Harsh or delayed shifts
Most likely causes
- Dirty or worn valve body, sticking valve
- Pressure sensor or switch drifting
- Mechanical damage: CVT belt or pulleys, pump, clutch
- Fluid level low or fluid aged
- Control module software thresholds
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P083B means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 8: Transmission
- 3B: Specific fault in that system
Frequently asked questions
Can I keep driving with code P083B?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P083B?
The most common causes are: dirty or worn valve body, sticking valve; pressure sensor or switch drifting; mechanical damage: CVT belt or pulleys, pump, clutch.
Related codes
- P083ATransmission Fluid Pressure Sensor/Switch G Circuit
- P083CTransmission Fluid Pressure Sensor/Switch G Circuit Low
- P083DTransmission Fluid Pressure Sensor/Switch G Circuit High
- P0841Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
- P084BTransmission Fluid Pressure Sensor/Switch H Circuit Range/Performance
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.