P083B: Transmission Fluid Pressure Sensor/Switch G Circuit Range/Performance

What does P083B mean?

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.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine or transmission warning lamp on
• Limp mode with substitute gear or limited ratio
• Harsh or delayed shifts

Common causes

• High Dirty or worn valve body, sticking valve
• High Pressure sensor or switch drifting
• Medium Mechanical damage: CVT belt or pulleys, pump, clutch
• Medium Fluid level low or fluid aged
• Low Control module software thresholds

Likelihood is a general estimate across vehicles; your make and model may differ.