OBD Code C0267: Pump Motor Circuit Open or Shorted – Causes, Symptoms & Fixes

Code C0267 is a chassis code that relates to your vehicle’s anti-lock braking system (ABS). Specifically, it indicates that the ABS pump motor circuit has detected an electrical fault—either an open circuit (broken connection) or a short circuit (unwanted electrical path). This code is typically stored by the ABS control module when it cannot properly communicate with or control the pump motor.

What Does C0267 Mean?

The C0267 code is part of the chassis diagnostic trouble code family, which focuses on vehicle control systems rather than engine management. In this case, it’s monitoring the pump motor circuit within your ABS system.

The ABS pump motor is responsible for building and maintaining hydraulic pressure in your brake system during anti-lock braking events. When the ABS control module detects that the pump motor circuit is either:

• Open: No electrical continuity (a break in the circuit or loose connection)
• Shorted: An unintended electrical connection causing excessive current flow

The control module sets code C0267 and typically disables the ABS system as a safety measure. This means your vehicle will still have normal braking capability, but ABS functionality is lost.

Common Symptoms

• ABS warning light illuminated on the dashboard
• Loss of ABS functionality (brakes still work normally, but without anti-lock protection)
• Possible brake warning light (if ABS is integrated with brake system monitoring)
• No noticeable change in braking feel during normal driving
• Brake pedal may feel slightly different during hard braking without ABS intervention
• Possible grinding or clicking sounds during emergency braking (wheels locking up)

Possible Causes

1. Corroded or loose pump motor connector – The most common cause; corrosion or poor connection prevents proper electrical contact
2. Damaged pump motor wiring harness – Frayed, pinched, or damaged wires in the circuit
3. Failed ABS pump motor – Internal motor failure or winding short circuit
4. Blown fuse or tripped relay – ABS pump motor circuit protection device failure
5. Faulty ABS control module – Rare; the module itself may have a defective pump motor driver circuit
6. Water intrusion or corrosion in the ABS module connector – Moisture causing electrical faults
7. Broken or corroded ground connection – Poor grounding of the pump motor circuit

Diagnostic Steps

Step 1: Scan for Additional Codes

Use a diagnostic scanner to pull all stored and pending codes. Multiple ABS-related codes can help pinpoint the issue (e.g., codes related to specific wheel speed sensors or other ABS components).

Step 2: Visually Inspect the ABS Pump Motor Connector

Locate the ABS module (typically under the hood near the brake master cylinder or inside the wheel well). Inspect the pump motor connector for:

• Corrosion or oxidation on the terminals
• Loose or bent pins
• Water intrusion or moisture
• Damaged connector housing

Step 3: Check Wiring Harness

Trace the pump motor wiring from the ABS module to the pump motor. Look for:

• Pinched or crushed wires
• Exposed copper or damaged insulation
• Wires rubbing against sharp edges
• Signs of heat damage

Step 4: Test Circuit Continuity

Using a multimeter set to ohms (resistance):

• Disconnect the pump motor connector
• Measure resistance between the pump motor terminals (should be low, typically 1-10 ohms depending on motor design)
• Measure resistance from each terminal to ground (should be infinite/open)
• If resistance is too high or infinite, the motor is open; if it’s very low to ground, there’s a short

Step 5: Test Power and Ground at the Connector

With the ignition on (engine off):

• Measure voltage at the pump motor connector terminals
• Verify proper ground connection
• Check for voltage spikes or drops during ABS operation (if possible)

Step 6: Check Fuse and Relay

Locate the ABS pump motor fuse and relay (consult your vehicle’s service manual for location). Test or replace if necessary.

Step 7: Clean Connectors

If corrosion is found, carefully clean the connector terminals with electrical contact cleaner and a soft brush. Reconnect and retest.

Step 8: Component Replacement

If the above steps identify a failed pump motor, damaged wiring, or faulty ABS module, replacement will be necessary.

Repair Cost Estimates

DIY Connector Cleaning: $0–$20 (contact cleaner and supplies)

Wiring Repair: $100–$300 (parts and labor for harness repair or replacement)

ABS Pump Motor Replacement: $400–$800 (parts and labor; varies by vehicle make/model)

ABS Control Module Replacement: $600–$1,500+ (expensive; usually only if module is faulty; may require reprogramming)

Professional Diagnostic: $100–$200 (if you prefer to have a technician diagnose the issue)

Note: Costs vary significantly based on vehicle make, model, year, and whether the ABS module is integrated with other brake or stability control systems.

Can I Still Drive?

Safety Assessment: Moderate Concern

Yes, you can still drive your vehicle with code C0267 set. Your regular braking system will function normally because the primary brake hydraulic circuit is separate from the ABS system. However, you should be aware of the following:

• No ABS Protection: Your wheels may lock up during hard braking on slippery surfaces, potentially causing loss of steering control
• Longer Stopping Distances: On wet or icy roads, stopping distances may be longer without ABS intervention
• Reduced Stability: In emergency braking situations, your vehicle may be harder to control
• Inspection Requirements: Some states may fail your vehicle during safety inspections with an active ABS fault code

Recommendation: Have the code diagnosed and repaired as soon as possible, especially if you frequently drive in wet or icy conditions. If the issue is simply a loose connector, it can often be fixed quickly and inexpensively.

Frequently Asked Questions

Q: Can a loose battery terminal cause code C0267?

A: Possibly, but unlikely to be the sole cause. A loose battery terminal would typically cause multiple electrical codes across different systems. However, if your battery connection is poor, it could contribute to voltage fluctuations that affect the ABS pump motor circuit. Check your battery connections first as part of your diagnostic process.

Q: Is code C0267 the same as a code related to wheel speed sensors?

A: No. C0267 specifically addresses the pump motor circuit, not wheel speed sensors. However, other ABS codes (like C0035, C0036, C0037, C0038 for wheel speed sensors) may appear alongside C0267 if there are multiple ABS system faults. Each code points to a different component or circuit.

Q: Will clearing the code fix the problem?

A: Clearing the code will not fix the underlying problem. The code will return once the ABS system runs its self-test again (usually within a few driving cycles). You must repair the actual fault—whether that’s cleaning a corroded connector, replacing damaged wiring, or replacing the pump motor itself.

Q: Can I replace the ABS pump motor myself?

A: This depends on your mechanical skill level and the vehicle. Some pump motors are relatively accessible, while others require removing the ABS module or other brake components. ABS work can be complex and may require specialized tools and knowledge of brake system bleeding procedures. If you’re not experienced with brake system repairs, it’s best to have a professional handle this to ensure safety and proper system operation.