P2127 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch 'E' Circuit Low

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2127 code

P2127 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch 'E' Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2127 DIAGNOSTIC Get a fair and transparent estimate upfront

P2127 code definition

The P2127 code is a generic OBD-II diagnostic trouble code indicating a fault with the throttle or pedal position sensor. This code may be seen with other throttle and pedal position sensor codes.

What the P2127 code means

The P2127 code means that the throttle or pedal position sensor switch E has a low input. The pedal position sensor is a sensor found on the gas pedal. The sensor tells the ECU when the gas pedal is depressed and how far it is depressed. When the ECU detects a low input from the pedal, it will trigger the Check Engine Light and the code P2127.

The Check Engine Light will be displayed on the dashboard. With the Check Engine Light, a failsafe mode may be set to prevent damage from being done to the vehicle. The failsafe mode will remain in effect until normal sensor operation is detected or the code is repaired.

What causes the P2127 code?

The most common causes of the P2127 code are:

  • Failed throttle or pedal position sensor
  • Open or short in the wiring harness
  • Poor or intermittent electrical connection
  • The vehicles ECU has failed or is failing

What are the symptoms of the P2127 code?

In all cases of the P2127 code, the Check Engine Light will be illuminated on the dashboard. In addition to the Check Engine Light, the car may not respond when the throttle is depressed, the vehicle may run poorly, and may stall or exhibit lack of power upon acceleration.

How does a mechanic diagnose the P2127 code?

Mechanics will begin by hooking up a scan tool to the vehicle's DLC port and checking for any codes that the ECU has stored. There may be multiple codes including history or pending codes. All codes will be noted as well as their associated freeze frame data, which tells us the circumstances the car was under, such as: RPM, vehicle speed, coolant temperature, and more. This information is critical when attempting to duplicate the symptoms.

Next, all codes will be cleared and a test drive performed under as close to the freeze frame conditions as possible. The technician will only attempt the test drive if the vehicle is safe to operate.

A visual inspection will then be performed looking for a damaged gas pedal, worn or exposed wiring, and broken components.

Afterwards, the scan tool will be used to view the live data and watch the throttle and gas pedal position's sensor e-values. These values should change as the throttle is depressed and released. Then the voltage will be checked at the pedal position sensor.

Lastly, the manufactures ECU testing procedure will be performed, and this will vary between make and model of vehicle.

Common mistakes when diagnosing the P2127 code

Mistakes are common when steps are not performed in the proper order or are skipped entirely. Even experienced technicians can miss easy problems when simple items, such as the visual inspection are not performed.

How serious is the P2127 code?

In most cases, the P2127 code will not prevent the vehicle from being driven to a safe location once the malfunction is detected. In rare cases, depressing the gas pedal will not elicit any response and the vehicle will not move. The vehicle should not be attempted to be driven when this occurs, or if you are experiencing any other serious driveability concerns.

What repairs can fix the P2127 code?

The most likely repairs for the P2127 code are:

Additional comments for consideration regarding the P2127 code

In cases where pressing the gas pedal gives no response, it can be a scary position to be in. When this occurs, do not attempt to operate the vehicle.

P2127 can require specialized tools when performing diagnosis. One such tool is a professional grade scan tool, these scan tools provide the information technicians need to diagnose P2127 and many other codes properly. Normal scan tools may only allow the code to be viewed and cleared, whereas the professional grade scan tool allows graphing of things such as sensor voltage and provides access to the datasteam of the vehicle which can be watched for changes in values over time.

Need help with a P2127 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P2127
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2127 code.

SCHEDULE P2127 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,361

Rating Summary
4,946
200
50
30
135
4,946
200
50
30
135

William

16 years of experience
64 reviews
William
16 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Denver, Colorado
Couldn’t be happier with my experience with William. Will happily recommend him to everyone and will definitely be using him again. Fantastic service.

Andrian

31 years of experience
112 reviews
Andrian
31 years of experience
BMW 525i - Check Engine Light is on - Fort Lauderdale, Florida
Highly recommend Adrian for all automotive services. Very professional and extremely knowledgeable about everything related to our car. He explained everything so we knew exactly what was needed and went above and beyond to make the process easy. I would never use another person to work on our cars. EXCELLENT OVERALL!!

Brian

22 years of experience
335 reviews
Brian
22 years of experience
Chevrolet Colorado - Check Engine Light is on - Orange Park, Florida
Brian is a very experienced mechanic. Billing not so sharp. Wrong time (corona-19).to be stiff with adding up, Informing the older customers what to expect? Very sorry to say goodbye to a great mechanic!

Scott

35 years of experience
665 reviews
Scott
35 years of experience
Dodge Grand Caravan - Check Engine Light is on - Phoenix, Arizona
This is the second time I have used his service. All I can say. if he can find my mistakes, he can fix anything. Thanks once again.


Related questions

APP sensor was replaced but the problem still exists.

Hi there. The throttle position sensor could be defective or the harness to the sensor could have a break in it. Check the harness for any loose or broke wires near the plug. If the harness is good and has...

Throttle control warning light is on and I have no power.

Hi there. The code P2127 is coming on for the throttle position sensor being disconnected or not communicating with the ECM (computer). Check the throttle position sensor to see if the resistance changes when the throttle is opened and closed....

I get trouble code P2138, but I have cleared it and the car works for a while. Now I am getting trouble code P2127 along with P2138.

Hi there. The pedal position sensor on the gas pedal has lost signal for the switch 'E' and 'D'. The code P2138 means that the computer has discovered a malfunction with the pedal sensor. Check the harness to the...

More related articles

P0307 OBD-II Trouble Code: Cylinder 7 Misfire Detected
P0307 code definition Cylinder 7 Misfire Detected What the P0307 code means When the P0307 diagnostic trouble code is stored by the...
P0881 OBD-II Trouble Code: Traction Control Module (TCM) Power Input Signal Range/Performance
P0881 means the traction control module is not working properly, possibly due to a faulty ON/OFF switch or damaged electrical components.
P2285 OBD-II Trouble Code: Injector Control Press Sensor Circuit Low
P2285 P2285 code definition Injector Control Press Sensor Circuit Low What the P2285 code means P2285 is an OBD-II generic code for the engine control module (ECM) detecting the injector control pressure (ICP) sensor is low and below specified sensor...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com