The second pedal track is reading low. Same family as P2123 and normally cured by the same repair.
P2127 — also written P2127, P 2127, 2127 — is the OBD-II code for throttle/pedal position sensor 'e' circuit low. Same code, same fix: this page covers every spelling of it.
P2127 is a engine fault code, typically costing £90–£400 to put right in a UK garage.
What causes P2127?
- Failed pedal sensor
- Corroded or damp connector
- Broken wire
How P2127 is fixed
- Check both pedal tracks track together through full travel
- Replace the pedal assembly
- Repair the connector
P2127 repair cost in the UK
Most P2127 repairs land between £90–£400 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 P2127?
Limp mode. Get it fixed promptly.
Urgency: high.
What P2127 is telling you
This code is the ECU saying the engine is not behaving the way its map predicts. The job in the workshop is finding which link in that chain is lying.
On P2127 specifically — throttle/pedal position sensor 'e' circuit low — 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 P2127 is diagnosed properly
Each of the known causes is ruled in or out in cost order, cheapest and most likely first. On P2127 that means working through them like this:
- Failed pedal sensor — 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.
- Corroded or damp connector — opened, inspected for green corrosion and spread pins, and back-probed rather than unplugged, so the reading is taken with the circuit live.
- Broken wire — 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 P2127 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 P2127
- Check both pedal tracks track together through full travel
- Replace the pedal assembly
- Repair the connector
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 P2127 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, P2127 typically lands at £90–£400 all-in at an independent garage in the UK — main-dealer quotes for the same job usually sit above that.
Getting P2127 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 P2127 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.