Air intakeGeneric OBD-II codeUrgency: Garage soon
Code P2127: pedal or throttle sensor "E": low signal
P2127 means: accelerator pedal position sensor or switch, or throttle "E": circuit low input.[1][2] The ECU has detected an abnormally low voltage in one of the circuits of the accelerator pedal or throttle position sensor, the one designated "E". The specific letter can mean something different depending on the manufacturer, so check the car's manual.[1]
What code P2127 means
The ECU has detected an abnormally low voltage in one of the circuits of the accelerator pedal or throttle position sensor, the one designated "E". The specific letter can mean something different depending on the manufacturer, so check the car's manual.[1]
On an electronic accelerator the pedal has a sensor with two independent signals so that the ECU can compare them. One of them is the redundant signal "E", which confirms the main one; if it drops below its minimum limit with the pedal released, the ECU discards the faulty channel and reduces engine power.[3]
Original definition (SAE J2012): Throttle/Pedal Position Sensor/Switch "E" Circuit Low[1][2]
Causes of P2127
From most to least likely, according to the sources.
- 1Faulty accelerator pedal position sensor.[1][2][3]
- 2Open circuit or short to earth in the signal circuit, or damaged, corroded or loose connectors.[1][2][3]
- 3Loss of the 5 V supply or of the sensor's earth.[2][3]
- 4Throttle sensor poorly secured or faulty, or defective throttle motor.[1][2]
- 5Engine ECU fault, which should only be suspected when everything else is fine.[1][2][3]
Symptoms
- Engine warning light on, sometimes with another light specific to the electronic throttle.[1][2][3]Engine warning light: faults that cause it
- The engine may enter limp mode, with limited revs and power.[1][3]Limp mode: faults that cause it
- Little or no response when accelerating and reduced performance.[1][2][3]Less power: faults that cause it
- Jerking, uneven acceleration or unstable idle.[1][2][3]Jerking: faults that cause it
- The engine may stall or stay at idle without revving up.[1][3]Engine stalls: faults that cause it
How to diagnose P2127
In order: from the most likely and cheapest to check to the most expensive.
- 1Read the codes with a diagnostic tool and note whether they appear alongside other pedal or throttle codes, which can hint at the affected circuit.[1][3]
- 2With the tool showing live data, watch the pedal's two signals: the low signal should rise smoothly as you press; a value stuck near zero points to an open or earthed circuit.[3]
- 3Inspect the pedal connector and wiring: separated or corroded terminals, moisture or chafed wires. Wiggle the harness with the ignition on to detect intermittent faults.[2][3]
- 4Check the sensor's 5 V supply and earth, and the continuity of the signal wire to the ECU.[3]
- 5If wiring, supply and earth are fine, replace the pedal assembly. Only after all of the above should the ECU be suspected.[1][3]
Can I keep driving with P2127?
Garage soon
The car usually limits power and responds poorly to the accelerator; with the engine cutting power or stalling it can be dangerous in traffic. It should be repaired before you go on using the car normally.[1][3]
Documented faults related to P2127
Known faults of specific engines and cars, with their repair cost, the affected years and their sources.
Accelerator pedal: the most serious faults by engine and car
- High severityFrequency: Rare1.0 VVT-i2010 recall for the accelerator pedalIn January 2010 Toyota recalled, as part of a worldwide campaign, the Aygo, Peugeot 107 and Citroën C1 built between February 2005 and August 2009 because of an accelerator pedal that could stay partly depressed or return slowly to idle.
- Critical severityFrequency: OccasionalMercedes-Benz GLE V167Accelerator pedal mounting plate that bends and releases the pedalThe plate that holds the accelerator pedal module can bend and release the pedal from the body; the pedal can then stay pressed down, prevent kickdown or obstruct the brake pedal. It affected 882 GLE models built between 3 and 17 May 2023.
- High severityFrequency: OccasionalToyota Aygo IAccelerator pedal slow to return on the Toyota Aygo (2010 campaign)In January 2010, Wikipedia records a Toyota recall over the accelerator pedal, which could return slowly to idle; it covered the Aygo, 107 and C1 built between February 2005 and August 2009, although it was later clarified that it only affected the automatic Aygo.
Engine sensors: the most serious faults by engine and car
- High severityFrequency: Occasional2.0 DTI and 2.2 DTIVP44 injection pump and air mass meter failureGerman Wikipedia documents recurring failures of the Bosch VP44 injection pump and the air mass meter in the early years of this engine. An owner testimony for this engine describes the pump being replaced at 192,500 km, at a cost the owner calls «prohibitive».
- Medium severityFrequency: Common2.0 TDIClogged particulate filter or faulty pressure sensorThe 2.0 TDI's particulate filter clogs if the car mostly makes short journeys, because it never gets to regenerate; sometimes the fault is just the differential pressure sensor. Cleaning it costs around €200 and replacing it, €800 to €3,000.Repair (garage): €800–€3,000
- Medium severityFrequency: Common1.4 and 1.6 8vCrankshaft position sensor failure (TDC sensor)The crankshaft position sensor (capteur PMH, or TDC sensor) appears repeatedly in the reliability sources for the Clio II, the Kangoo I and the Dacia Logan I with this engine, with hard cold starting or stalling as the main symptoms. It is a cheap part, but the failure can leave you stranded.
- Medium severityFrequency: Common1.4 and 1.6 16vCrankshaft position sensor failureThe crankshaft position sensor (capteur PMH) appears repeatedly in the reliability sources for almost every generation with this engine, with hard cold starting, stalling or the car cutting out unexpectedly. It is a cheap part, but the failure can leave you stranded.
Wiring, connectors and short circuits: the most serious faults by engine and car
- Critical severityFrequency: OccasionalBMW N62 / N63Additional turbo coolant pump with a risk of short circuit and fireIn 2011 BMW recalled 5, 6 and 7 Series, X5 and X6 models built between 2007 and 2011 because of the additional turbo coolant pump: moisture, a short circuit and, in extreme cases, a fire. In 2012 there was another campaign for a crack in the pump, with a more robust version.
- Critical severityFrequency: Occasional1.6 GDi híbrido (Kappa)Main relay of the power relay assembly (overheating and fire risk)Yes, on the first units: Hyundai and Kia recalled 2016–2018 Ioniq and Niro hybrids and plug-in hybrids because the main relay that connects the high-voltage battery could come loose, overheat and, in the worst case, cause a fire.
- Critical severityFrequency: Occasional1.6 GDi híbrido (Kappa)Clutch hydraulic actuator (HCA): leak or moisture with risk of short circuit and fireYes, this is the most documented hybrid system fault: the hydraulic actuator that engages the combustion engine with the hybrid assembly has had two recalls (2018 for a leak on the Niro and 2025 for moisture in its electronic board on the Niro, Ceed and XCeed PHEV), with a risk of short circuit and fire.
- High severityFrequency: Occasional1.3 TCeBlown fuel pump fuseOn the Renault Captur II and Clio V with the 1.3 TCe engine, a 20-amp fuse can blow and leave the car without an engine. According to L'argus, in April 2021 this fault still had no factory fix; the official service centre's diagnosis includes checking, and sometimes replacing, the catalytic converter.
- Critical severityFrequency: CommonRover 75Seat SRS connector fault with airbag and seatbelt warning light onAuto Express warns that the Rover 75's seat SRS connector can cause the airbags to fail, and dealers were fixing it with revised connectors. The Dutch APK inspection puts the airbag or seatbelt fault warning among the most frequent defects across almost all series.
- Critical severityFrequency: OccasionalAlfa Romeo GiuliettaShort circuit from badly routed wiring that can prevent gear shifting (KBA campaign, 2010-2015)Yes: according to Germany's KBA, on Alfa Romeo Giulietta cars built between 2010 and 2015 inadequate cable routing could cause a short circuit and, as a result, gear-shift failure.
Frequently asked questions
Can I drive with code P2127?
You can get to the garage with care, but it is not advisable to keep using the car. It will normally go into reduced-power mode and, in the worst case, the engine may sit at idle or stall, which is a risk in traffic.[1][3]
What does the "E" in P2127 mean?
It is the letter the standard uses to designate one of the circuits of the pedal or throttle sensor. Its exact meaning can vary by manufacturer, so you need to consult the manual for the specific car.[1]
Does the accelerator pedal always need replacing?
No. The pedal is a common cause, but so are a corroded connector, a broken wire or a lost 5 V supply. It is worth testing wiring, supply and earth before replacing the assembly.[2][3]
Does P2127 mean the same on all brands?
It is a generic code, so its general definition is the same, but manufacturers may assign the letter "E" to a different circuit. The most likely cause changes from one car to another.[1]
Will I pass the MOT with code P2127?
If the code has switched on the engine warning light, no: with that light on, the inspection records a serious defect, and on Euro 5 and Euro 6 cars the ITV (Spain's roadworthiness inspection, similar to the MOT) also reads the OBD diagnostic system. Repair the fault before you go; clearing the code just before the inspection does not help either, because it counts as a serious defect.[4]
Not sure what is wrong with your car? Describe what you notice in the symptom diagnosis or see all fault codes.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- P2127: Throttle/Pedal Position Sensor/Switch E Circuit LowCarParts.com · Technical documentation · consulted 29 October 2026
- OBD DTC Fehlercode P2127CarWiki · Technical documentation · consulted 29 October 2026 · in German
- P2127 - Throttle/Pedal Position Sensor/Switch E Circuit Low InputAutoDTCs · Technical documentation · consulted 29 October 2026
- Desmontando mitos: ¿puede pasar mi coche la ITV con el testigo de «avería motor» encendido?Diariomotor · Motoring press · published 8 March 2021 · consulted 2 October 2026 · in Spanish