What Does P083C Mean?
The TCM has detected that the voltage on the transmission fluid pressure sensor/switch "G" circuit is below the minimum expected threshold. This low signal condition suggests the sensor is shorted, the wiring has a short to ground, or the sensor reference voltage is missing. The TCM cannot reliably determine transmission line pressure in the G circuit.
Common Causes
35%
Internally shorted transmission fluid pressure sensor G
30%
Short to ground in sensor signal wiring
20%
Corroded connector causing low-resistance path to ground
10%
Transmission fluid contamination shorting sensor element
5%
TCM internal pull-up or reference circuit failure
Diagnostic Steps
1
Monitor the pressure sensor G PID — a near-zero voltage reading confirms the low circuit condition.
2
Disconnect the sensor connector and check if the voltage at the TCM side rises to reference voltage (typically 5V); if so, the sensor is shorted.
3
Measure the sensor resistance and compare to specifications — an abnormally low reading indicates an internal short.
4
With the sensor disconnected, check the signal wire for continuity to ground (there should be none).
5
Inspect the internal transmission harness connector for fluid contamination or corrosion that could cause a short.
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The TCM has detected that the voltage on the transmission fluid pressure sensor/switch "G" circuit is below the minimum expected threshold. This low signal condition suggests the sensor is shorted, the wiring has a short to ground, or the sensor reference voltage is missing. The TCM cannot reliably ...
The most common cause of P083C (Transmission Fluid Pressure Sensor/Switch "G" Circuit Low) is: Internally shorted transmission fluid pressure sensor G
Typical repair costs for P083C range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The transmission may exhibit harsh shifting or enter limp mode. Drivable at reduced performance but have it repaired soon to avoid potential transmission damage from unmonitored pressure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P083C to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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