What Does C0315 Mean?
C0315 indicates that the Electronic Brake Control Module (EBCM) or ABS control module has detected an open circuit in the ground path for an electric motor, typically associated with ABS pump motor, stability control actuator, or electric power steering motor. The control module cannot complete the electrical circuit to ground, preventing proper motor operation. This fault prevents the affected system from functioning and may disable traction control, ABS, or stability control features.
Safety Warning
Not safe to drive as ABS, traction control, and stability control systems are likely disabled, significantly increasing risk of loss of control during emergency braking or slippery conditions. Vehicle should be repaired immediately before normal operation.
Common Causes
45%
Broken, corroded, or loose ground wire/terminal connection at motor or chassis ground point
25%
Damaged wiring harness with open circuit between motor and control module ground circuit
20%
Failed motor with internal open circuit in ground path or brush assembly failure
10%
Control module internal ground circuit failure or corroded module connector pins
Diagnostic Steps
1
Step 1: Perform visual inspection of all ground connections associated with the ABS/stability control motor assembly. Check for loose, corroded, or damaged ground straps, terminals, and chassis ground points. Clean and tighten all ground connections found.
2
Step 2: Using a digital multimeter, measure resistance from motor ground terminal to known good chassis ground. Reading should be less than 0.5 ohms. If reading is infinite or high resistance, trace ground circuit to locate open.
3
Step 3: Disconnect motor connector and measure resistance through motor ground circuit from connector to chassis ground. If circuit is open (infinite resistance), locate and repair wiring break. If circuit tests good, suspect motor internal failure.
4
Step 4: With motor disconnected, perform continuity test on motor ground terminal. Motor should show continuity to its case/housing. If no continuity, motor has internal open ground and requires replacement.
5
Step 5: Inspect control module connector for pushed-out pins, corrosion, or terminal damage on ground circuit pins. Use wiring diagram to identify specific ground pins and verify integrity.
6
Step 6: After repairs, clear codes and perform test drive with active maneuvers (controlled braking, stability control engagement) to verify proper motor operation and confirm no code return.
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
C0315 indicates that the Electronic Brake Control Module (EBCM) or ABS control module has detected an open circuit in the ground path for an electric motor, typically associated with ABS pump motor, stability control actuator, or electric power steering motor. The control module cannot complete the ...
The most common cause of C0315 (Motor Ground Circuit Open) is: Broken, corroded, or loose ground wire/terminal connection at motor or chassis ground point
Typical repair costs for C0315 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not safe to drive as ABS, traction control, and stability control systems are likely disabled, significantly increasing risk of loss of control during emergency braking or slippery conditions. Vehicle should be repaired immediately before normal operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0315 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS) / Electronic Stability Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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