C0043Brake Pedal Position Sensor Circuit B
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Covers circuit B of the brake pedal position sensor, the redundant second channel that the module cross-checks against channel A (C0042). Dual-channel pedal position sensors provide two independent voltage signals, often with opposite slopes, so the module can detect a single-channel fault by correlation. This code is set when channel B is out of range, open, shorted or does not track channel A within tolerance. It supports brake-by-wire assist, regenerative braking blending and precise stop-lamp and cruise control. A fault can disable assist and cruise functions and set a warning lamp while base braking remains. No manufacturer documents this code publicly; NHTSA's EPS report lists C0043 in its J2012 table, and its brake study explains how the module uses the pedal sensor to read driver intent.
- What you may notice
- Brake lights stay on or behave oddly
- Cruise control will not set
- ABS or brake warning lamp on
- Likely causes
- LikelyPedal position sensor channel B out of range
- PossibleChannel A/B signals do not correlate
- RareHarness or connector fault
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.