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Engine-Codes – Generic – C1381

C1381 Code - Acceleration Sensor Power Supply Voltage Malfunction

Quick Answer

The C1381 diagnostic trouble code (DTC) indicates an issue with the Acceleration Sensor Power Supply Voltage in the vehicle. Common causes include Wiring issues or shorts in the acceleration sensor circuit, Faulty acceleration sensor, Malfunctioning control module. 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
C1381 indicates Acceleration Sensor Power Supply Voltage Malfunction.
Common causes
Common causes include Wiring issues or shorts in the acceleration sensor circuit, Faulty acceleration sensor, Malfunctioning control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code C1381 Description

The C1381 diagnostic trouble code (DTC) indicates an issue with the Acceleration Sensor Power Supply Voltage in the vehicle. This sensor is responsible for measuring the acceleration of the vehicle and providing essential data to the vehicle's control module. The power supply voltage malfunction can disrupt the sensor's ability to accurately measure acceleration, which can lead to various performance issues in the vehicle.

OBDII Code C1381 - Acceleration Sensor Power Supply Voltage Malfunction
C1381 Code - Acceleration Sensor Power Supply Voltage Malfunction

Common Causes of C1381

  1. Wiring issues or shorts in the acceleration sensor circuit
  2. Faulty acceleration sensor
  3. Malfunctioning control module
  4. Power supply voltage irregularities
  5. Poor electrical connections or corrosion in the sensor circuit

Symptoms of C1381

  1. Sluggish acceleration
  2. Hesitation when accelerating
  3. Lack of power during acceleration
  4. Stability control or traction control issues
  5. Illuminated warning lights on the dashboard related to the acceleration system

How to Fix C1381

  1. Begin by conducting a thorough inspection of the acceleration sensor circuit, including the wiring, connections, and sensor itself.
  2. Test the power supply voltage to the sensor to determine if it is within the manufacturer's specified range.
  3. If the voltage is outside of the acceptable range, diagnose and repair any issues with the power supply.
  4. Replace the acceleration sensor if it is found to be faulty or malfunctioning.
  5. Clear the DTC and perform a test drive to ensure that the issue has been resolved and that the sensor is providing accurate data to the vehicle's systems.

Cost to Fix C1381

The typical cost to repair a C1381 code related to the Acceleration Sensor Power Supply Voltage malfunction can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate based on your location and vehicle type.

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Code C1381 Information for Specific Makes

  • C1381 Lexus — Acceleration Sensor Power Supply Voltage Malfunction
  • C1381 Scion — Acceleration Sensor Power Supply Voltage Malfunction
  • C1381 Toyota — Acceleration Sensor Power Supply Voltage Malfunction
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 C1381 Code

1. What are the common symptoms of OBDII code C1381 (Acceleration Sensor Power Supply Voltage Malfunction)?

- Common symptoms include the ABS warning light coming on, issues with the vehicle stability control system, and potential loss of traction control.

2. What are the possible causes of OBDII code C1381?

- Possible causes include a malfunctioning acceleration sensor, a faulty power supply to the sensor, damaged wiring or connectors, or issues with the ABS control module.

3. How can I diagnose the cause of OBDII code C1381?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific fault codes, inspecting the acceleration sensor and its wiring for damage, and testing the power supply voltage to the sensor.

4. Can I continue driving my vehicle with OBDII code C1381 present?

- It is not recommended to continue driving with this code present, as it may affect the vehicle's stability control and traction control systems, potentially compromising safety.

5. How can I repair OBDII code C1381?

- Repair options may include replacing the acceleration sensor, repairing or replacing damaged wiring or connectors, checking and repairing the power supply to the sensor, or reprogramming the ABS control module if necessary.

6. Is it safe to reset the OBDII code C1381 without addressing the underlying issue?

- Resetting the code without addressing the underlying issue may temporarily turn off the warning light, but the problem will likely reoccur, potentially affecting the vehicle's safety systems.

7. Can a DIY enthusiast fix OBDII code C1381 at home?

- While some aspects of diagnosing and repairing this code can be done at home, it may require specialized tools and expertise, so it's recommended to consult a professional mechanic for proper diagnosis and repair.

8. Are there any preventive measures to avoid OBDII code C1381 in the future?

- Regular maintenance checks, including inspecting the ABS system components and wiring, can help prevent issues that may trigger OBDII code C1381.

9. How long does it typically take to repair OBDII code C1381?

- The repair time can vary depending on the exact cause of the code and the availability of parts, but it may take a few hours to a full day for a qualified mechanic to diagnose and fix the issue.

10. Will fixing OBDII code C1381 improve my vehicle's performance?

- Fixing this code will primarily restore the proper functioning of the stability control and traction control systems, ensuring safe and reliable operation of your vehicle.

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