P2127Throttle/Pedal Position Sensor/Switch E Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2127 reports that pedal track E reads below its lower limit. Because many pedals run the second track at roughly half the voltage of the first, the limit for E can sit lower than for D: GM's 2006 tables flag sensor 2 under 0.1625 V and the 2014 VW Passat under 0.27 V, against 0.61 V for track D. Full-scale designs use similar limits on both tracks: Ford 0.25 V, GM's 2023 table 0.28 V for 0.2 s, GM's Bosch-based 2012 ECM 0.625 V. Typical causes are a short to ground on the E signal wire, an open reference feed, or a worn spot at the closed end of the track. With E gone the ECU relies on track D alone and holds back torque. P2128 is the high fault on E, P2122 the low fault on D, P2125 the general E circuit code.
- What you may notice
- Engine warning lamp, on newer Fords together with the wrench lamp
- Reduced power and slower pedal response
- Traction control may be switched off
- Likely causes
- LikelyTrack E signal wire shorted to ground
- PossibleOpen 5 V reference feed for the second track
- PossibleWorn track E at the closed-pedal end
- RareCorroded or loose pedal connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.