AutoCodes – Honda – P2128 2008 Honda Accord

P2128 2008 Honda Accord Code - Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage

Quick Answer

Accelerator Pedal Position (APP) sensor B is a part of the Electronic Throttle Control System (ETCS), and it is used to convert the position of the accelerator pedal into electrical signals. Common causes include Faulty Accelerator Pedal Position, Accelerator Pedal Position harness is open or shorted, Accelerator Pedal Position 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: P2128 2008 Honda Accord indicates Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage.
Common causes: Common causes include Faulty Accelerator Pedal Position, Accelerator Pedal Position harness is open or shorted, Accelerator Pedal Position 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 6,847

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2128 2008 Honda Accord Description

Accelerator Pedal Position (APP) sensor B is a part of the Electronic Throttle Control System (ETCS), and it is used to convert the position of the accelerator pedal into electrical signals. Based on these signals, the Powertrain Control Module (PCM) controls the throttle actuator so that the throttle position agrees with the accelerator pedal position. If the signal voltage from APP sensor A is a set value or less, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P2128 2008 Honda Accord - Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage - AutoCodes.com — P2128 2008 Honda Accord Code - Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2128 2008 Honda Accord?

Faulty Accelerator Pedal Position
Accelerator Pedal Position harness is open or shorted
Accelerator Pedal Position circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P2128 2008 Honda Accord?

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 does this mean?

Code Tech Notes

ECM may have to be updated.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2128 2008 Honda Accord 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 P2128 2008 Honda Accord Code

1. What are the common symptoms of OBDII code P2128 in a 2008 Honda Accord?

- Common symptoms include poor acceleration, reduced engine power, and the vehicle going into limp mode.

2. What causes the OBDII code P2128 in a 2008 Honda Accord?

- The code usually indicates a fault in the accelerator pedal position sensor 'B' or throttle position sensor 'D', often due to wiring issues or sensor failure.

3. How can I diagnose the cause of OBDII code P2128 in my 2008 Honda Accord?

- Use a diagnostic scan tool to check for the specific trouble code, inspect the wiring harness for damage, and test the sensors' voltage and resistance.

4. Can I continue driving my 2008 Honda Accord with OBDII code P2128 present?

- It is not recommended to drive the vehicle with this code as it can lead to further damage and potentially unsafe driving conditions.

5. How can I repair OBDII code P2128 in my 2008 Honda Accord?

- Repair options include replacing the faulty accelerator pedal position sensor 'B', throttle position sensor 'D', or repairing any damaged wiring in the circuit.

6. Will resetting the OBDII code P2128 in my 2008 Honda Accord make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue is not fixed, the code is likely to reappear after some driving cycles.

7. Are there any DIY tips for fixing OBDII code P2128 in a 2008 Honda Accord?

- DIYers can start by checking the wiring connections, cleaning the sensors, and ensuring proper sensor installation to address the issue.

8. Can a mechanic help me diagnose and repair OBDII code P2128 in my 2008 Honda Accord?

- Yes, a qualified mechanic can use specialized tools and expertise to diagnose and repair the issue causing the OBDII code P2128.

9. How much does it cost to fix OBDII code P2128 in a 2008 Honda Accord at a repair shop?

- The cost can vary depending on the exact cause of the issue, but it typically involves sensor replacement or wiring repair, which may range from $200 to $500.

10. Is OBDII code P2128 a common issue in 2008 Honda Accords?

- While not extremely common, OBDII code P2128 can occur in 2008 Honda Accords due to sensor wear, wiring issues, or other factors affecting the accelerator and throttle position sensors.