P2125 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch "E" Circuit

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2125 code

P2125 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch "E" Circuit". 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 P2125 DIAGNOSTIC Get a fair and transparent estimate upfront

P2125 code definition

P2125 is a general OBD-II trouble code indicating a fault with the throttle/pedal position sensor/switch “E” circuit. This code is similar to many other throttle body and pedal position codes.

What the P2125 code means

The engine control module (ECM) uses the signals from the throttle body and position sensor to command the throttle body actuator motor to open the throttle plate. This allows air into the engine and is varied by how hard the pedal is pressed and how far.

This code will only be seen on cars with a drive-by-wire or an electronically controlled throttle body. Once the ECM detects a fault with the sensor or switch circuit “E” the P2125 code is set, and this causes a Check Engine Light to be displayed on the dashboard. With the Check Engine Light, the ECM puts the vehicle into a failsafe mode to prevent any further damage to the vehicle.

What causes the P2125 code?

Many different components can cause the P2125 code:

  • Open or short in the wiring harness
  • Failed throttle actuator control motor
  • Throttle position sensor that has failed
  • Failed pedal position sensor
  • Poor electrical connection

What are the symptoms of the P2125 code?

Symptoms can sometimes be felt before the Check Engine Light is displayed on the dashboard. A wide range of symptoms are seen with the P2125 code such as:

  • Check Engine Light illuminated on the dash
  • The vehicle may not move when the gas pedal is depressed
  • Engine may exhibit a misfire condition
  • Vehicle may run poorly

How does a mechanic diagnose the P2125 code?

Mechanics will follow these simple steps when performing diagnosis of the P2125 code:

  • Using a scan tool to check the ECM for any stored codes including history and pending codes

  • Noting all codes that are present as well as the freeze frame data associated with each code

  • Clearing all codes for a clean slate

  • Performing a test drive of the vehicle attempting to duplicate the conditions found in the freeze frame data

  • Conducting a visual inspection to look for any damaged components, worn or broken wires, and broken parts

  • Using the scan tool and its datastream to watch the sensor “E” while the throttle and gas pedal are operated. There should be changes in the values if they are working properly.

  • Finally, a multimeter will be used to check that voltage is present at the sensor and for continuity

Common mistakes when diagnosing the P2125 code

Mistakes can be made with any code if steps are not followed in the proper order or skipped entirely. Overlooking simple steps can lead to the wrong components being replaced which wastes both time and money.

How serious is the P2125 code?

P2125 can have some rather serious symptoms. If the ECM can’t detect the signal from the throttle/pedal switch, it may not allow the throttle to work at all. If this occurs, the vehicle will not move at all when the gas pedal is depressed. If drivability problems are present, the vehicle should not be driven and should be repaired as soon as possible.

What repairs can fix the P2125 code?

The most common repairs of the P2125 code are:

Additional comments for consideration regarding the P2125 code

An advanced-level scan tool goes a long way towards helping diagnose the P2125 code. These tools give technicians access to advanced features in the ECM with the most helpful being the ECM’s live data stream. This tool shows sensor and solenoid data, and allows the mechanic to monitor operation and note changes over time.

Need help with a P2125 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.

Check Engine Light
trouble codes
P2125

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2125 code.

SCHEDULE P2125 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,295)

Rating Summary
5,825
224
52
35
159
5,825
224
52
35
159

JOHNNY

33 years of experience
96 reviews
JOHNNY
33 years of experience
BMW 325Ci - Check Engine Light is on - Sacramento, California
He was great explained everything to me and have now booked him for another appointment. Thanks johnny.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Mercedes-Benz C300 - Check Engine Light is on - Spring, Texas
Mister Ron was very nice and took time out to explain any concerns I might have about my car. He also made sure he communicated with me when he was on his way, once he was outside, and when we was done working on my car. I appreciate that considering I have a newborn that I had to look after.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Ram 1500 - Check Engine Light is on - Spring, Texas
Extremely satisfied with the service, he was able to come out and diagnose almost immediately. We purchased the parts, he came back installed them and been running great since. Would definitely recommend him and will not hesitate to call again if needed.

Scott

36 years of experience
802 reviews
Scott
36 years of experience
Dodge Neon - Check Engine Light is on - Tempe, Arizona
I truly enjoy Scott as he has done work for me in the past. Scott is very friendly, knowledgeable, and a true professional! I highly recommend him.


Related questions

2009 Buick Lacrosse is setting DTC codes P2125 and P2138.

Hi there. Try performing a snap throttle and see if the wave form changes on the Oscilloscope. If the waves do not change when performing a snap throttle, then the throttle position sensor on the pedal needs replaced. If the...

More related articles

P0500 OBD-II Trouble Code: Vehicle Speed Sensor Malfunction
P0500 code definition P0500 is a general OBD-II code that indicates a malfunction has been detected in the vehicle speed sensor circuit....
P0287 OBD-II Trouble Code: Cylinder 9 Contribution/Balance Fault
P0287 P0287 code definition A P0287 Trouble Code indicates cylinder 9 contribution/balance fault. What the P0287 code means In the event of a P0287 code appearing and storing in the vehicle, it means that there is an abnormal reading in...
P0319 OBD-II Trouble Code: Rough Road Sensor B Signal Circuit
P0319 means the vehicle's crankshaft position changed due to defective, disconnected, or missing rough road sensors.

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