Error code

OBD2 P2138

OBD2P2138
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Throttle/Pedal Position Sensor/Switch 'D' / 'E' Voltage Correlation.

Severity

highDriving may be limited due to reduced acceleration and potential engine stall. It is advisable to have the issue addressed promptly.

Summary

Code P2138 indicates that there is a discrepancy in voltage signals between throttle position sensor (TPS) and pedal position sensor (PPS) circuits D/E, which are part of the drive-by-wire system.

Symptoms

  • Limited or no acceleration
  • Stuck throttle at any RPM
  • Engine stall when allowed to idle
  • Hesitation when accelerating
  • Cruise control inoperative

Common Causes

  • Defective TPS or PPS sensor
  • Corroded electrical connectors
  • Open or shorted circuits between sensors and PCM
  • Faulty DBW actuator motor

Diagnosis

  1. Perform a visual inspection of all system-related wiring and connectors.
  2. Check for carbon buildup or damage on the throttle plate.
  3. Use a scanner to retrieve stored trouble codes and freeze frame data.
  4. Test sensors individually with a digital volt/ohmmeter (DVOM).
  5. Consult technical service bulletins (TSB) specific to your vehicle.

Fixes

  • Replace defective TPS or PPS sensor, repair wiring/connectors, and replace faulty DBW actuator motor as needed.

FAQ

What is the drive-by-wire system?

The drive-by-wire system replaces traditional throttle cables with electronic sensors and actuators to control engine acceleration, improving efficiency and emissions.

How does a PPS sensor work?

A pedal position sensor (PPS) detects the position of the accelerator pedal and sends signals to the PCM to adjust throttle plate opening accordingly.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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