C0115 critical

ABS Pump Motor Circuit Open

The C0115 code means the vehicle's onboard diagnostic system has detected: ABS Pump Motor Circuit Open. This is a critical severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $50 - $1200 (parts and labor)

Read ABS Codes

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Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.

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Read ABS Codes

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Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.

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Common Symptoms

ABS warning light on
No ABS function when braking hard
Traction control disabled
Stability control light on
Brake pedal feels normal but ABS does not engage

Probable Causes (Ranked by Likelihood)

Open circuit in ABS pump motor winding Very High
Blown ABS pump motor fuse or relay High
Corroded pump motor electrical connector Moderate
Broken wire in pump motor circuit Moderate
ABS control module driver circuit failure Low

Step-by-Step Diagnostic Procedure

Check the ABS pump motor fuse and relay first
Test for voltage at the pump motor connector when ABS is commanded on
Measure pump motor winding resistance -- an open circuit reads infinite ohms
Inspect the connector and wiring for corrosion or damage
Swap the ABS relay with a known good relay of the same type

Frequently Asked Questions

What does an open circuit mean for the ABS pump?

An open circuit means electrical continuity is broken somewhere in the pump motor circuit. The module cannot power the pump, so ABS cannot build the hydraulic pressure needed to modulate braking.

Could a blown fuse cause C0115?

Yes. A blown ABS pump motor fuse is one of the simplest causes of this code. Always check fuses and relays first before condemning the pump motor itself.

Can I repair the ABS pump motor wiring?

If the open circuit is in the wiring harness rather than inside the pump motor itself, yes. Repair the damaged wire and ensure all connections are clean and tight. If the motor winding is open internally, the pump motor must be replaced.