C056E: Brake Pedal Position Sensor Supply Voltage Circuit High

What it means

The brake pedal position sensor supply voltage is above the expected range. The module may not receive a reliable pedal-position signal.

At a glance

• Usually lights the ABS or stability-control warning light
• The engine or gearbox may go into limp mode

How it works

The brake pedal position sensor needs a supply voltage so it can report pedal position to the brake control module. C056E sets when that supply is higher than expected, which can make pedal-position information unreliable.

Common causes

Most likely first.

1. Supply wire shorted to battery
2. Connector pins corroded - high contact resistance
3. Supply wire pinched against B+ source

Symptoms

• Brake or stability-control warning light
• Brake-related functions may be limited

How to diagnose it

1. Check brake-module freeze-frame and live data for pedal position and supply-related faults to see whether the high reading is persistent.
2. Inspect the pedal position sensor connector and harness for corroded pins, pinched insulation, or contact with a battery-positive feed.
3. With the vehicle powered down as specified by the manufacturer, check whether the supply wire is shorted to battery voltage.
4. Measure supply voltage at the sensor connector and compare it with the manufacturer’s specification.
5. If no short is visible, test the supply wire and connector for continuity and unintended connection to adjacent powered circuits.

Common fixes

• Repair a supply wire shorted to battery voltage.
• Replace or repair a connector with corroded or damaged terminals.
• Repair a pinched or chafed supply wire near a B+ source.
• Repair unintended contact between the sensor supply and a neighboring powered circuit.

Can I keep driving?

A brake or stability-control warning may indicate that pedal-position-based functions are limited. Avoid relying on stability or braking assistance features, and stop driving if braking response changes; arrange prompt diagnosis.