The ECU has seen the brake and accelerator applied together in a way it does not trust and has cut power for safety.
P2299 — also written P2299, P 2299, 2299 — is the OBD-II code for brake pedal position / accelerator pedal position incompatible. Same code, same fix: this page covers every spelling of it.
P2299 is a engine fault code, typically costing £50–£350 to put right in a UK garage.
What causes P2299?
- Faulty brake light switch
- Sticking accelerator pedal or floor mat interference
- Pedal sensor fault
- Wiring fault
How P2299 is fixed
- Replace and adjust the brake light switch
- Check for mat or trim interference at the pedals
- Test both pedal sensor tracks
P2299 repair cost in the UK
Most P2299 repairs land between £50–£350 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2299?
Power will be cut when it triggers. Fix it before driving in traffic.
Urgency: high.
What P2299 is telling you
Engine-management codes of this type are set when a measured value disagrees with the model the ECU holds for a healthy engine. The code names the circuit that failed the check, not the part that has to be replaced.
On P2299 specifically — brake pedal position / accelerator pedal position incompatible — the stored code records the moment that check failed, not the moment the part gave up. That gap is why two cars with the same code can need completely different repairs.
How P2299 is diagnosed properly
Each of the known causes is ruled in or out in cost order, cheapest and most likely first. On P2299 that means working through them like this:
- Faulty brake light switch — confirmed with live data before any part is bought.
- Sticking accelerator pedal or floor mat interference — confirmed with live data before any part is bought.
- Pedal sensor fault — compared against live data and a known-good reference before it is condemned — a sensor reading the wrong thing accurately is a different fault from a dead one.
- Wiring fault — checked with the loom flexed and the engine warm, because a wiring fault that is intermittent when cold shows itself under heat and vibration.
An hour of diagnostic time on P2299 routinely saves more than it costs, because the alternative is buying the most expensive part on that list and hoping.
The repairs that actually clear P2299
- Replace and adjust the brake light switch
- Check for mat or trim interference at the pedals
- Test both pedal sensor tracks
After the repair the code is cleared and the car is driven until the relevant readiness monitor completes, rather than handed back as soon as the light goes out. A code that has only been erased will come straight back on the next drive cycle.
What happens if P2299 is ignored
Leaving this one is the expensive choice. The protection strategy the ECU falls into is there to limit damage, and every mile driven with the fault active is a mile the engine or gearbox spends outside its designed operating window.
For reference, P2299 typically lands at £50–£350 all-in at an independent garage in the UK — main-dealer quotes for the same job usually sit above that.
Getting P2299 looked at
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P2299 is showing on your car, bring the scan results with you — we will read the live data ourselves, tell you which of the causes above it actually is, and price the repair before any work starts.