AutoCodes – Buick – P2125 Buick

P2125 Buick Code - Accelerator Pedal Position Sensor 2 Circuit

Quick Answer

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2125 Buick indicates Accelerator Pedal Position Sensor 2 Circuit.
Common causes: Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,419

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2125 Buick Description

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. The Engine Control Module (ECM) supplies a separate 5-volt reference circuit and a low reference circuit for each of the sensors. The 5-volt reference for APP sensor 1 is supplied from the same source in the ECM as the 5-volt reference for the mass air flow (MAF) sensor and the fuel tank pressure (FTP) sensor. The 5-volt reference voltage for all of the sensors is supplied on separate ECM terminals, but the terminals are connected internally to a voltage supply. The APP sensor 1 sends a signal from the sensor to the ECM indicating the accelerator pedal position. The ECM actuates the throttle plates based on this information. If the ECM detects that the APP sensors are not within a predicted value from each other, DTC P2125 sets.

OBDII Code P2125 Buick - Accelerator Pedal Position Sensor 2 Circuit - AutoCodes.com — P2125 Buick Code - Accelerator Pedal Position Sensor 2 Circuit

What does this mean?

What are the Possible Causes of the DTC P2125 Buick?

Faulty Accelerator Pedal Position Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Electric Throttle Control Actuator

How to Fix the DTC P2125 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2125 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2125 Buick Code

1. What does the OBDII code P2125 mean on a Buick?

P2125 indicates an issue with the Accelerator Pedal Position (APP) Sensor 2 Circuit, which monitors the position of the accelerator pedal to help control throttle response.

2. What are the common symptoms of code P2125 in a Buick?

Symptoms may include reduced engine performance, lack of throttle response, the vehicle entering "limp mode," or the illumination of the check engine light.

3. What causes the P2125 code to appear in a Buick?

Common causes include a faulty APP sensor, damaged wiring or connectors in the APP sensor circuit, or issues with the throttle body or Engine Control Module (ECM).

4. Can I drive my Buick with a P2125 code?

While the vehicle may still be drivable, it could experience reduced power or enter limp mode, potentially making it unsafe. Address the issue as soon as possible.

5. How is the P2125 code diagnosed in a Buick?

A mechanic will use a scan tool to confirm the code, inspect the APP sensor and its wiring, test the sensor’s voltage, and check for other related trouble codes.

6. How do you fix the P2125 code on a Buick?

Repairs may involve replacing the APP sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to repair the P2125 code in a Buick?

The repair cost varies but typically ranges from $100 to $300 for sensor or wiring repairs. ECM replacement or reprogramming could cost more.

8. Can a dirty throttle body cause the P2125 code in a Buick?

While the P2125 code is specific to the APP sensor circuit, a dirty or malfunctioning throttle body may cause related throttle response issues but is not a direct cause of this code.

9. How do I prevent the P2125 code from recurring in my Buick?

Regular maintenance, such as inspecting and cleaning electrical connections and ensuring the sensor and throttle body are in good condition, can help prevent the issue.

10. Will clearing the P2125 code with a scan tool fix the issue?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning.