P1286 Accelerator Pedal Position Sensor Supply Voltage Too High

P1286 Accelerator Pedal Position Sensor Supply Voltage Too High is an error code that indicates a voltage issue in the accelerator pedal position sensor.

This usually occurs when the supply voltage of the sensor exceeds its limits. The most common cause for this error code is a faulty or worn-out accelerator pedal position sensor, but it could also be caused by other issues such as an electrical short circuit or wiring problem.

The error code P1286 Accelerator Pedal Position Sensor Supply Voltage Too High, serves as a warning sign, indicating that the sensor’s functionality may be compromised.

While the immediate effects might not be readily apparent, prolonged exposure to elevated supply voltage can lead to issues such as reduced engine power, decreased fuel efficiency, and even trigger the vehicle’s Check Engine Light.

In this article, we will delve into the intricacies of this error code, understand its implications, and explore the steps to diagnose and rectify the issue.

Understanding the Accelerator Pedal Position Sensor

P1286 Accelerator Pedal Position Sensor Supply Voltage Too High

The Link Between Pedal and Performance

At the core of modern vehicles’ drive-by-wire systems lies the accelerator pedal position sensor. This sensor, often overlooked in its significance, bridges the gap between a driver’s intent and the engine’s response.

As the driver presses or releases the accelerator pedal, the sensor detects the degree of pedal depression and translates it into electrical signals.

These signals are then transmitted to the engine control module, which in turn adjusts the throttle position accordingly. This seamless communication ensures precise throttle control, responsiveness, and fuel efficiency.

Also Read: P1480 Pcv Solenoid Valve Open Or Shorted

Possible Causes of High Accelerator Pedal Position Sensor Voltage

Several factors can contribute to the elevated supply voltage experienced by the accelerator pedal position sensor:

  • Wiring Issues: Corroded, damaged, or short-circuited wires can disrupt the normal flow of electrical current, leading to voltage irregularities.
  • Sensor Malfunction: Internal faults within the sensor can cause it to draw excessive voltage from the power source.
  • ECM Problems: An issue with the engine control module itself might disrupt the regulation of supply voltage to various components, including the sensor.

Read More About: P1480 Open Or Shorted Condition Detected In The Positive Crankcase Ventilation

How to Fix the P1286 Error Code

P1286 Accelerator Pedal Position Sensor Supply Voltage Too High

Fixing the “P1286 Accelerator Pedal Position Sensor Supply Voltage Too High” error code requires a systematic approach and careful troubleshooting. Here’s a step-by-step process to address the issue.

Step 1: Gather Materials and Tools:

  • OBD-II scanner
  • Multimeter
  • Basic hand tools (screwdrivers, pliers, etc.)
  • Replacement accelerator pedal position sensor (if needed)
  • Wiring repair kit (if needed)
  • Safety gloves and eye protection

Step 2: Use an OBD-II Scanner:

Connect the OBD-II scanner to the vehicle’s OBD-II port (usually located under the dashboard).

Retrieve the error codes, specifically the “P1286” code, along with any other relevant diagnostic trouble codes (DTCs).

Step 3: Sensor Inspection

  • Consult the vehicle’s service manual to locate the accelerator pedal position sensor.
  • Disconnect the sensor’s electrical connector.
  • Use a multimeter to test the sensor’s resistance and voltage according to the manufacturer’s specifications.
  • If the sensor readings are outside the acceptable range, it may indicate a malfunctioning sensor that needs replacement.

Step 4: Voltage Measurement

  • Reconnect the battery and start the vehicle.
  • With the multimeter set to voltage mode, measure the actual supply voltage at the accelerator pedal position sensor’s connector.
  • Compare the measured voltage to the vehicle’s specifications for acceptable supply voltage. If it is significantly higher, there might be an issue with the power supply or the ECM.

Step 5: Inspect ECM and Power Supply

  • If the voltage at the sensor is too high, carefully inspect the vehicle’s ECM for any signs of damage or issues.
  • Check the vehicle’s power supply system, including fuses and relays, to ensure they are functioning correctly.

Step 6: Replacement of Components

  • If the accelerator pedal position sensor is confirmed to be faulty, replace it with a genuine or OEM-approved replacement part.
  • Follow the manufacturer’s guidelines for sensor replacement, including proper calibration procedures if required.

Step 7: Clearing Error Codes:

  • After addressing the issue, use the OBD-II scanner to clear the error codes from the vehicle’s ECM memory.
  • This will reset the Check Engine Light and allow you to monitor the vehicle’s performance for any recurrence of the error code.

Step 8: Test Drive and Monitor

How to Fix the P1286 Error Code
  • Take the vehicle for a test drive to ensure that the symptoms are resolved and that there are no abnormal behaviors.
  • Monitor the vehicle’s performance over time to verify that the issue has been successfully resolved.

Also Read: P1198 Radiator Temperature Sensor Voltage Too High

Frequently Asked Questions

1. What Does The P1286 Error Code Mean?

The P1286 code indicates excessively high supply voltage to the accelerator pedal position sensor, potentially affecting throttle control.

2. Can I Still Drive With The P1286 Error Code?

Driving is possible, but reduced power and unpredictable throttle response could compromise safety and performance.

3. Can I Diagnose And Fix The P1286 Code Myself?

If experienced, you can diagnose by using an OBD-II scanner, visually inspecting, testing the sensor, and measuring supply voltage.

4. Can I Reset The Error Code Myself?

Yes, an OBD-II scanner can clear the code, resetting the Check Engine Light. Address the underlying cause to prevent recurrence.

5. How Can I Prevent The P1286 Error Code?

Routine maintenance, gentle driving, and periodic inspections of wiring and connectors can help prevent electronic issues.

Also Read: P1481 Eatx Rpm Pulse Generator Signal for Misfire Detection

Pedal Position Sensor

Pedal Position Sensor

The PPS is a small electronic device that measures changes in pedal position information as you drive, providing real-time feedback about how hard or soft your foot is pressing on the accelerator.

The most common type of PPS uses Hall effect sensing technology which works by detecting changes in magnetic fields around it when a metal object passes through its detection area.

This allows it to detect even slight changes in pressure from your foot on the pedals, giving vehicle owners more control over their driving experience.

In addition to this, PPSs can also be used as part of an anti-lock braking system (ABS) so that if you press down too hard on your brakes, they will react quicker than normal and help prevent skidding and loss of control while taking turns or braking suddenly.

The use of a PPS offers many advantages when compared to traditional methods of measuring pedal positions like potentiometers or switches.

Also Read: P1483 Catalyst Temperature Sensor Circuit Shorted High

Accelerator Pedal Position Sensor


The P1286 error code, signaling high supply voltage to the accelerator pedal position sensor, is a crucial indicator of potential issues within a vehicle’s electronic control system.

Understanding the intricate relationship between the accelerator pedal, sensor, and ECM sheds light on the importance of timely diagnosis and repair.

By following the steps outlined in this article, you can effectively identify the root cause of the problem and take the necessary actions to restore your vehicle’s optimal performance.