How is fault code P2138 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Read live data on both pedal position sensors simultaneously. Both should track from 0 to 100% smoothly with the accelerator pressed; values should always match within a few percent. If they diverge, the pedal is the fault 2. Inspect the pedal wiring and connector under the dashboard; six wires (two power, two ground, two signals) should all be intact and seated correctly 3. Check for moisture or damage at the connector 4. Disconnect and reseat the connector, sometimes a poor seat is enough to set the code 5. If pedal and wiring are clean, swap a known-good pedal if available, otherwise replace based on best evidence

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

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Read live data on both pedal position sensors simultaneously. Both should track from 0 to 100% smoothly with the accelerator pressed; values should always match within a few percent. If they diverge, the pedal is the fault 2.

PPowertrain
2Generic code
1Fuel / Air
38Sequence number

What does it mean?

P2138 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Throttle/Pedal Pos Sensor/Switch D / E Voltage Correlation . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.