Powertrain, generic · Transmission

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

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,500
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission fluid pressure sensortransmission valve bodytransmission wiringtransmission control module

Related codes

P083AP083CP083DP0841P084B

References: law.cornell.edu, gearsmagazine.com.