ABS Pump Motor Circuit Open
The C1096 code indicates that the ABS control module has detected an open circuit in the hydraulic pump motor. This pump is responsible for generating the hydraulic pressure needed for ABS operation during emergency braking. An open circuit prevents the module from activating the pump motor, resulting in loss of ABS and potentially electronic stability control functionality.
1. Commonly Affected Makes
2. Most Common Causes
- Failed or burned-out ABS hydraulic pump motor
- Corroded, loose, or disconnected pump motor electrical connector
- Cut, broken, or high-resistance wiring in the pump motor circuit
- Defective ABS pump relay (if applicable)
- Blown fuse for the ABS pump motor circuit
- Internally damaged ABS control module (motor driver)
3. Symptoms You Will Notice
- ABS warning light illuminated on the dashboard
- Loss of ABS function during braking
- Possible loss of electronic stability control (ESC)
- Increased stopping distances on slippery surfaces
4. Step-by-Step Diagnosis
Scan for codes and verify C1096 is present
Inspect the ABS pump motor fuse and replace if blown
Check the pump motor relay (if equipped) for proper operation
Visually inspect the pump motor connector and wiring for damage or corrosion
Measure voltage and ground at the pump motor connector with the module commanding operation
Test pump motor resistance and compare to specifications
If all else is normal, suspect a faulty ABS module
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The ABS and stability control systems will be disabled, increasing the risk of loss of control during emergency braking or on slippery roads. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $1,200 USD, depending on the root cause. A simple fuse or relay replacement may cost under $100, while a new ABS pump motor or module can exceed $1,000 including labor.