how to fix c0267 pump motor circuit open chevy silverado

3 min read 06-02-2025

how to fix c0267 pump motor circuit open chevy silverado

The dreaded C0267 trouble code. If you own a Chevy Silverado and see this code, it means your vehicle has detected an open circuit in the pump motor circuit. This usually points to a problem with the fuel pump, but the issue could lie elsewhere in the electrical system. This article will guide you through troubleshooting and fixing this common problem. Let's get started.

Understanding the C0267 Code

The diagnostic trouble code (DTC) C0267 specifically indicates an open circuit in the fuel pump motor circuit. This means there's a break in the electrical pathway preventing power from reaching the fuel pump. Without power, the fuel pump won't work, leaving your Silverado unable to start or run properly.

Common Causes of C0267 in Chevy Silverados

Several issues can trigger the C0267 code. Let's explore the most common:

1. Faulty Fuel Pump

The most likely culprit is a malfunctioning fuel pump itself. Over time, the pump can wear out, its internal components failing, causing an open circuit. This is especially true for high-mileage Silverados.

2. Blown Fuel Pump Fuse or Relay

A blown fuse or a faulty relay can interrupt the electrical flow to the pump. These are relatively inexpensive and easy parts to check and replace. Consult your owner's manual for the location of these components.

3. Wiring Issues

Damaged, corroded, or loose wiring in the fuel pump circuit is another potential cause. Inspect all wiring connections, looking for any breaks, corrosion, or loose connections. Pay particular attention to areas that might experience abrasion or vibration.

4. Fuel Pump Module Problems (Certain Models)

Some Chevy Silverado models use a fuel pump module, which integrates the fuel pump, sending unit, and other components. A problem within this module can result in the C0267 code. Replacing the entire module might be necessary in such cases.

5. PCM Issues (Rare)

While less common, a faulty Powertrain Control Module (PCM) could also cause the C0267 code. The PCM is the vehicle's computer and controls various aspects of the engine and drivetrain. Diagnosing a PCM problem requires specialized tools and expertise.

Troubleshooting Steps for C0267

Before you start replacing parts, systematically troubleshoot the issue:

1. Check the Fuel Pump Fuse and Relay

Start by visually inspecting the fuel pump fuse and relay. Use a multimeter to confirm whether they are functioning correctly. Replace them if they are blown or faulty.

2. Inspect the Wiring Harness

Carefully inspect the wiring harness leading to the fuel pump. Look for any signs of damage, such as cuts, abrasions, corrosion, or loose connections. Repair or replace any damaged wiring.

3. Test Fuel Pump Power

Use a multimeter to check if the fuel pump is receiving power. This requires accessing the fuel pump wiring connector. Refer to your owner's manual or a repair manual for precise connector locations. If the pump isn't receiving power, trace the circuit back to find the break.

4. Check Fuel Pump Pressure (Advanced)

If power is reaching the pump, measure the fuel pressure using a fuel pressure gauge. Low or no fuel pressure confirms a faulty fuel pump. This step often requires specialized tools.

5. Consider Professional Help

If you're not comfortable performing electrical diagnostics or fuel system repairs, consult a qualified mechanic. Attempting repairs without the necessary knowledge could damage other components or create safety hazards.

Replacing the Fuel Pump (If Necessary)

Replacing a fuel pump is often the solution to a C0267 code. This process varies depending on your specific Silverado model and year. Consult a repair manual or online tutorials for detailed step-by-step instructions. Always follow safety precautions when working with fuel systems.

Preventative Maintenance

Regular vehicle maintenance can help prevent C0267 and other fuel system issues:

Regular Fuel Filter Changes: A clogged fuel filter can strain the fuel pump.
Use Quality Fuel: Avoid using low-quality fuel that might contain contaminants.
Address Leaks Promptly: Repair any fuel leaks immediately to avoid further damage.

Conclusion

The C0267 code in your Chevy Silverado usually indicates a problem with the fuel pump circuit. By following the troubleshooting steps above, you can usually identify and resolve the issue. Remember to prioritize safety and consult a professional if you are not comfortable performing the repairs yourself. Good luck!