What it means
This code identifies a fault associated with brake pedal position sensor circuit A. The specific failure depends on the diagnostic subtype.
How it works
Brake pedal position sensor circuit A carries one of the signals used by the brake-control system to determine pedal movement or position. This code identifies a subfault in circuit A, but the base code does not establish whether its signal is low, high, intermittent, or otherwise invalid.
Common causes
Most likely first.
- Faulty pedal position sensor
- Damaged wiring or connector
- Poor sensor power or ground
- Misadjusted sensor
- Brake control module fault
Symptoms
- ABS or brake warning light
- Stability control warning
- Cruise control may not work
- Unusual brake pedal response
How to diagnose it
- Scan the brake-control module and review freeze-frame data, then compare live circuit A pedal-position data with pedal movement.
- Inspect the circuit A sensor connector and wiring around the pedal for loose terminals, abrasion, moisture, or damage.
- Check sensor mounting and adjustment, and confirm that circuit A's reading changes smoothly as the pedal is pressed and released.
- Test circuit A's power, ground, and signal wiring against the vehicle diagram and manufacturer's procedure, including a gentle harness movement test for intermittency.
- If wiring and adjustment are correct, test the BPP sensor and brake-control module input to isolate the failed component.
Common fixes
- Reconnect or clean the circuit A sensor connector.
- Repair damaged circuit A wiring or restore a poor sensor ground.
- Correct the sensor mounting or adjustment.
- Replace the BPP sensor if circuit A remains faulty during testing.
- Repair the brake-control module only if its circuit A input is confirmed defective.
Can I keep driving?
ABS or stability control may be reduced, cruise control may be unavailable, and pedal-related control behavior may be unusual. If braking feel changes or a brake warning appears, stop in a safe place and have the system checked before continuing.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.