ABS Enable Relay Circuit Open
The C0027 code means the vehicle's onboard diagnostic system has detected: ABS Enable Relay Circuit Open. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $30 - $350 (parts and labor)
Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.
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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
- ABS completely non-functional
- No click from ABS relay at startup
- All ABS-related features disabled
Probable Causes (Ranked by Likelihood)
- Burned out ABS enable relay coil Very High
- Broken relay control wire High
- Corroded relay connector pins Moderate
- ABS module relay driver open circuit Low
Step-by-Step Diagnostic Procedure
-
Check ABS relay for proper click when commanded
-
Measure relay coil resistance
-
Inspect relay control circuit wiring for breaks
-
Test ABS module relay driver output signal
Frequently Asked Questions
What does open circuit mean for the ABS relay?
No current can flow through the relay circuit, preventing the ABS system from receiving power.
How do I test the ABS relay coil?
Remove the relay and measure resistance across the coil terminals. Typical reading is 50 to 120 ohms.
Can a wiring issue cause this code?
Yes, a broken wire between the ABS module and relay can cause an open circuit.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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