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Engine-Codes – Generic – C1251

C1251 Code - Open In Pump Motor Circuit

Quick Answer

The C1251 diagnostic trouble code indicates an open in the pump motor circuit of the vehicle's anti-lock braking system (ABS). Common causes include Damaged wiring or connectors in the pump motor circuit, Corrosion or water intrusion in the ABS system components, Faulty ABS pump motor. 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
C1251 indicates Open In Pump Motor Circuit.
Common causes
Common causes include Damaged wiring or connectors in the pump motor circuit, Corrosion or water intrusion in the ABS system components, Faulty ABS pump motor.
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 07, 2024
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Code C1251 Description

The C1251 diagnostic trouble code indicates an open in the pump motor circuit of the vehicle's anti-lock braking system (ABS). The ABS pump motor is responsible for building hydraulic pressure within the ABS system to assist with braking during emergency or hard braking situations. When there is an open circuit in the pump motor, it means that there is a break in the electrical connection that supplies power to the motor. This can lead to the ABS system not functioning properly, potentially compromising the vehicle's ability to brake safely in certain conditions.

OBDII Code C1251 - Open In Pump Motor Circuit
C1251 Code - Open In Pump Motor Circuit

Common Causes of C1251

  1. Damaged wiring or connectors in the pump motor circuit
  2. Corrosion or water intrusion in the ABS system components
  3. Faulty ABS pump motor
  4. Electrical issues in the vehicle's wiring harness
  5. Malfunctioning ABS control module

Symptoms of C1251

  1. ABS warning light illuminated on the dashboard
  2. Loss of ABS functionality during braking
  3. Increased stopping distance during braking
  4. Unusual noises coming from the ABS pump motor
  5. Difficulty maintaining control of the vehicle during braking on slippery surfaces

How to Fix C1251

  1. Diagnose the issue using a scan tool to confirm the C1251 code and identify the specific cause of the open circuit.
  2. Inspect the wiring and connectors in the pump motor circuit for any damage or corrosion. Repair or replace any damaged components.
  3. Test the ABS pump motor to determine if it is functioning correctly. Replace the pump motor if necessary.
  4. Check the ABS control module for any faults or malfunctions. Replace the control module if needed.
  5. Clear the diagnostic trouble codes, reset the ABS system, and perform a road test to verify that the issue has been resolved.

Cost to Fix C1251

The typical repair costs for addressing an open circuit in the pump motor circuit (C1251) can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local repair shops for a more accurate estimate based on your specific circumstances.

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Code C1251 Information for Specific Makes

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 C1251 Code

1. What are the common symptoms of OBDII code C1251 (Open In Pump Motor Circuit)?

Common symptoms include the ABS warning light illuminating on the dashboard, decreased braking performance, and potential activation of the vehicle's limp mode.

2. What could cause the OBDII code C1251 to trigger?

The code C1251 typically triggers due to an open circuit in the pump motor circuit of the anti-lock braking system (ABS). This can be caused by damaged wiring, a faulty ABS pump motor, or a corroded connector.

3. How can I diagnose the cause of the open circuit in the pump motor circuit?

To diagnose the issue, you can start by visually inspecting the wiring harness for any signs of damage or corrosion. Using a multimeter, you can also test the continuity along the circuit to identify the specific location of the open circuit.

4. Is it safe to drive with OBDII code C1251 present?

It is not recommended to drive with the C1251 code active, as it indicates a potential issue with the ABS system that may compromise braking performance and overall safety. It is advised to address the problem promptly.

5. Can I reset the OBDII code C1251 without fixing the underlying issue?

While you can clear the code using an OBDII scanner, the issue causing the code to trigger will persist until properly repaired. Clearing the code without fixing the problem will likely result in the code reappearing.

6. How can I repair the open circuit in the pump motor circuit associated with code C1251?

Repairing the open circuit involves locating the damaged section of the wiring harness, repairing or replacing the wiring, and ensuring proper connection to the ABS pump motor. In some cases, replacing the ABS pump motor may be necessary.

7. Will fixing the open circuit in the pump motor circuit reset the OBDII code C1251?

Once you have repaired the open circuit and resolved the issue in the pump motor circuit, you can use an OBDII scanner to clear the code. After clearing the code, monitor the system to ensure the code does not reappear.

8. Are there any preventive measures to avoid OBDII code C1251 in the future?

To prevent OBDII code C1251 from occurring, regularly inspect the wiring harness for signs of wear or damage, ensure proper maintenance of the ABS system, and address any issues promptly to avoid further damage.

9. Can a DIY enthusiast repair the open circuit causing OBDII code C1251?

If you have experience with automotive electrical systems and access to the necessary tools, you may be able to repair the open circuit yourself. However, if you are unsure or uncomfortable with electrical repairs, it is recommended to seek professional assistance.

10. Is it necessary to visit a dealership for OBDII code C1251 repair?

While a dealership can certainly assist with diagnosing and repairing OBDII code C1251, independent auto repair shops and knowledgeable DIY enthusiasts can also effectively address the issue. The key is ensuring the proper diagnosis and repair procedures are followed to resolve the problem.

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