P2983

Transmission Fluid Pressure Sensor/Switch D Circuit High

P2983 is a generic OBD-II powertrain diagnostic trouble code: Transmission Fluid Pressure Sensor/Switch D Circuit High. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P2983
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P2983 means

P2983 is stored when the TCM or ECM detects that the signal voltage from transmission fluid pressure sensor or switch D is above the maximum threshold defined in the control module calibration. A high-circuit condition on a pressure sensor typically indicates a short to voltage on the signal wire, an open sensor ground, or a sensor that has internally failed and is outputting a voltage above its normal operating range.

Pressure sensor D monitors a specific hydraulic clutch circuit inside the automatic transmission and provides real-time feedback to the transmission control module for adaptive shift learning and pressure regulation. When the signal is stuck at or near supply voltage, the TCM cannot accurately assess whether the hydraulic circuit is engaging at the correct pressure, which impairs shift quality control and may trigger limp-home or failsafe strategies.

As with other circuit-high faults, diagnosis should begin with the electrical circuit. An open ground wire is one of the most frequent causes, as it allows the signal to float toward the reference supply voltage. After confirming wiring integrity, the sensor can be tested for correct output by monitoring its signal voltage against known good pressure values during a functional test.

Common causes

Most-frequently reported root causes when P2983 is logged.

  • 1
    Short to voltage on the pressure sensor D signal wire.
  • 2
    Open ground circuit at the sensor causing the signal to float high.
  • 3
    Internally failed pressure sensor outputting maximum voltage.
  • 4
    Wiring harness chafing against a power source inside the transmission tunnel.
  • 5
    Corroded sensor connector creating an unintended voltage path.
  • 6
    TCM connector pin damage affecting the pressure sensor input circuit.
  • 7
    Incorrect replacement sensor with an incompatible output range installed.

Symptoms drivers notice

MIL or transmission warning indicator illuminated.
Transmission may enter limp-home mode with limited gear selection.
Scan tool shows pressure sensor D PID at an abnormally high fixed value.
Harsh or erratic shifts if the TCM cannot regulate circuit D pressure.
No engine performance concerns; fault is isolated to the transmission control circuit.

How to diagnose P2983

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all TCM and ECM DTCs and review freeze-frame data for operating conditions at fault occurrence.
  2. 2
    Access the transmission fluid pressure sensor D connector and inspect wiring for damage or chafing.
  3. 3
    Measure the signal voltage at the sensor connector with the ignition on; a reading near supply voltage with the sensor disconnected confirms a short to power in the harness.
  4. 4
    Check ground wire continuity and resistance from the sensor connector to the TCM or chassis ground.
  5. 5
    With the sensor connected, compare the signal voltage against known hydraulic pressures during operation.
  6. 6
    Replace the pressure sensor if wiring tests are normal and the sensor output is confirmed stuck high.
  7. 7
    Clear codes and verify repair with multiple shift cycles before returning the vehicle to service.

Related powertrain codes

Frequently asked questions

Is P2983 the opposite of a low-circuit fault on the same sensor?

Yes, a companion low-circuit code would flag signal voltage below minimum; P2983 flags signal voltage above maximum, typically from opposing electrical fault types.

Can P2983 cause the transmission to get stuck in one gear?

Yes, if the TCM cannot trust the circuit D pressure reading it may engage a failsafe strategy that locks the transmission in a single gear to protect internal components.

Do I need to drop the transmission pan to replace sensor D?

On most vehicles, transmission pressure sensors are accessible externally on the valve body housing without removing the transmission, but location varies by model.

Can a bad TCM cause P2983?

TCM internal faults are rare; always fully verify the sensor and wiring circuit before suspecting the control module as the source of a circuit-high code.

Disabling P2983 in software

RaceTune can permanently disable P2983 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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