C0267 OBD code meaning: ABS Pump Motor Circuit Open

Last Updated on May 6, 2025

When your car displays the C0267 code, it points to an issue with the ABS pump motor circuit—specifically, an “open” or faulty connection detected by the Electronic Brake Control Module (EBCM). This error can compromise your anti-lock braking system (ABS), making your car less safe during hard braking or slippery conditions.

In this complete guide, you’ll learn what the C0267 code means, how the ABS pump motor works, what causes this fault, and how to diagnose and fix it effectively.

What Does the C0267 Code Mean?

The OBD-II code C0267 means that the EBCM has detected an open or improper signal in the ABS pump motor circuit. The pump motor plays a crucial role in maintaining the hydraulic pressure required for ABS to function correctly.

When the motor fails to operate or its signal is disrupted, the EBCM cannot properly control braking pressure—leading to loss of ABS function, poor braking performance, and a lit ABS warning light on your dashboard.

How the ABS Pump Motor Circuit Works

The Anti-lock Braking System (ABS) is a safety feature designed to prevent your vehicle’s wheels from locking during hard braking, allowing you to maintain steering control.

Here’s how it works:

1. Wheel speed sensors detect wheel rotation speed.
2. The EBCM receives the sensor data.
3. If it senses a wheel is about to lock, the EBCM activates the ABS pump and valves.
4. The pump motor restores lost pressure after the valve releases it to prevent lock-up.

The ABS pump motor circuit is the electrical pathway that powers the pump motor. If it’s open (disconnected) or malfunctioning, the ABS can’t work as designed.

Symptoms of the C0267 Trouble Code

You may notice the following signs if your vehicle has a C0267 ABS fault:

• 🚨 ABS Warning Light On – One of the most obvious indicators.
• 🛑 Inoperative ABS Function – ABS doesn’t activate under emergency braking.
• 🔧 Engine Light On (Check Engine Light) – Depending on the car model.
• 🔄 Abnormal Braking Behavior – Brake pedal feels too soft or too stiff.
• ❗ Vehicle Won’t Start – In rare cases, due to system protection.
• 🔥 Engine Misfires or Performance Issues – Caused by miscommunication between the ABS and engine systems.
• 📉 Poor Brake Response – Increased stopping distance or uneven braking.

If you notice any of these, scanning with an OBD-II scanner will likely reveal the C0267 error code.

What Causes the C0267 Code?

The C0267 code appears when the Electronic Brake Control Module (EBCM) detects an open or faulty circuit in the ABS pump motor. Several underlying issues can trigger this code, ranging from electrical faults to mechanical failures. Let’s explore the most common causes in detail:

1. Faulty ABS Pump Motor

The ABS pump motor plays a critical role in maintaining hydraulic pressure within the anti-lock braking system. Over time, the motor can wear out, seize, or short internally, causing it to fail. A faulty motor can’t respond to the EBCM’s commands, leading to the C0267 code.

2. Damaged or Corroded Wiring

Wiring harnesses that connect the ABS pump motor to the control module are exposed to heat, moisture, and vibration. Cracked insulation, corrosion, or loose connectors can interrupt signal flow or create a high-resistance path—triggering an “open circuit” detection.

3. Blown ABS Fuse or Relay

A blown fuse or faulty relay can stop power from reaching the ABS pump motor. While it’s a relatively simple fix, it’s often overlooked. If the fuse blows repeatedly, it may indicate a deeper issue like a short circuit.

4. Defective EBCM (Electronic Brake Control Module)

The EBCM manages the ABS pump’s activation. If the module itself has internal logic or sensor faults, it may misread pump signals or fail to command pump activation, even if the pump is in good condition.

5. Pump Motor Circuit Disconnection

If the electrical connector to the pump motor is loose, unplugged, or physically broken, the EBCM will report an “open circuit,” causing this code.

6. Low Brake Fluid Level

Low brake fluid doesn’t directly cause an open circuit, but it affects the ABS system’s hydraulic balance. The EBCM might shut down the pump to protect the system, leading to communication errors.

7. Poor Ground Connection

The ABS pump motor relies on a solid ground to function. A rusted or weak ground wire can mimic a broken circuit, confusing the EBCM and triggering a C0267 fault.

How to Diagnose the C0267 Code

Diagnosing the C0267 error code properly is crucial to avoid unnecessary part replacements and to restore safe braking performance. Here’s a step-by-step guide to help you pinpoint the issue:

Step 1: Confirm the Code with an OBD-II Scanner

Start by plugging an OBD-II scan tool into your vehicle’s diagnostic port. Confirm the presence of C0267 and check for any additional related codes, such as C0265, C0268, or U0121, which could indicate a broader ABS or CAN communication problem.

Step 2: Visually Inspect the ABS Pump Motor and Wiring

• Locate the ABS pump motor (usually near the master cylinder or fender wall).
• Inspect the wiring harness connected to the pump.
• Check for corrosion, burnt wires, frayed insulation, or disconnected plugs.
• Clean all connectors with electrical contact cleaner and reseat them securely.

Step 3: Check the ABS Fuse and Relay

• Refer to your vehicle’s manual to locate the ABS-related fuse and relay.
• Use a multimeter to check fuse continuity.
• If blown, replace the fuse—but also investigate why it blew (e.g., short circuit or overload).
• Test the relay by swapping it with a known working one of the same type.

Step 4: Test ABS Pump Motor Functionality

• Use a multimeter to check for proper resistance (ohms) across the pump motor terminals.
• A reading of “OL” (open loop) usually means the motor windings are broken.
• If accessible, apply 12V directly to the motor momentarily to test its operation (consult your service manual for safe procedures).

Step 5: Inspect the EBCM

• If all components are functional and wiring is intact, the issue may be the Electronic Brake Control Module itself.
• Test EBCM voltage outputs and ground references using a multimeter.
• For deeper analysis, a bi-directional scan tool or factory-specific diagnostic tool may be required.

Step 6: Check for Ground and Voltage Supply

• Trace the ground wire from the pump motor to its chassis point.
• Remove any rust or buildup and ensure clean metal-to-metal contact.
• Verify the pump is getting battery voltage when the system is active.

Warning:

Do not replace the ABS pump or EBCM without thorough testing. These parts can be expensive, and misdiagnosis may lead to further issues or wasted costs.

How to Fix the C0267 Code

Once diagnosed, here are your repair options based on the issue found:

Cause	Fix
Faulty ABS pump motor	Replace the ABS pump motor
Damaged wiring	Repair or replace the damaged circuit wires
Corroded connectors	Clean or replace corroded terminals
Blown fuse or relay	Replace with OEM-specified fuse or relay
Faulty EBCM	Replace or reprogram the EBCM
Low brake fluid	Top up brake fluid to manufacturer-specified level

Cost to Diagnose and Repair C0267 Code

Diagnostic Cost:

• Typically between $70–$140, depending on your location and vehicle model.

Repair Cost:

• ABS Pump Motor Replacement: $300–$800
• EBCM Replacement: $400–$1,200
• Wiring Repair: $50–$200
• Brake Fluid Top-Up: $20–$50

Tips to Prevent C0267 Code from Returning

To avoid future ABS-related issues:

• ✔ Check brake fluid levels monthly
• ✔ Inspect ABS wiring annually
• ✔ Address ABS or check engine lights immediately
• ✔ Service your braking system as recommended
• ✔ Avoid driving through deep water or salty roads without cleaning undercarriage

Tools You’ll Need for DIY Fix

• OBD-II Scanner
• Multimeter
• Replacement fuses/relays
• Socket set
• Wire strippers and connectors
• Brake fluid (DOT 3 or 4, per vehicle)
• Service manual (for wire diagrams and fuse locations)

Real-World Examples

Case 1 – 2007 Chevy Silverado:
A user reported ABS and traction control lights coming on. OBD-II showed C0267. Upon inspection, a broken wire at the ABS motor connector was found and repaired, resolving the issue.

Case 2 – 2010 Cadillac CTS:
The owner experienced long braking distances. C0267 code revealed ABS pump motor failure. Replacement cost was $750 including labor.

FAQs About the C0267 Code

Q1: Can I still drive with the C0267 code?
A: Yes, but cautiously. Your ABS won’t function properly, so stopping distances may increase, especially in slippery conditions.

Q2: Will clearing the code fix the problem?
A: No. You must diagnose and repair the root cause before clearing the code.

Q3: Can a bad battery trigger C0267?
A: Rarely, but low voltage or unstable electrical supply can cause signal issues that mimic motor faults.

Q4: Is this code specific to GM vehicles?
A: It’s common in GM vehicles like Chevy, GMC, and Cadillac, but can appear in other models with similar ABS architecture.

Q5: How long does it take to fix this?
A: Diagnosis and repair can take anywhere from 1–4 hours depending on accessibility and part availability.

Final Thoughts: Fix the C0267 Code Before It’s Too Late

The C0267 ABS pump motor circuit open error is not something to ignore. It disables your ABS system and can compromise braking safety in emergencies.

Fortunately, the code is fixable with the right tools and knowledge. Whether it’s a fuse, wiring issue, or motor failure, a proper inspection will guide you to the solution.

Don’t delay—address the C0267 code promptly and restore your car’s braking performance to ensure safety for you and your passengers.