ABS Control Module Ground Circuit
The C0004 code means the vehicle's onboard diagnostic system has detected: ABS Control Module Ground Circuit. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $50 - $300 (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
- Multiple ABS codes stored
- Intermittent ABS operation
- Traction control disabled
Probable Causes (Ranked by Likelihood)
- Corroded ABS module ground terminal Very High
- Loose ground wire bolt High
- Damaged ground wire insulation Moderate
- Rusted body ground point Low
Step-by-Step Diagnostic Procedure
-
Locate the ABS module ground point on the vehicle body
-
Inspect ground wire and terminal for corrosion
-
Measure voltage drop on the ground circuit
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Clean and secure all ABS module ground connections
Frequently Asked Questions
What causes a bad ABS module ground?
Corrosion is the most common cause, especially in areas with road salt. Loose bolts and damaged wires also contribute.
How do I test an ABS module ground?
Perform a voltage drop test on the ground circuit. With ABS active, voltage drop should be less than 0.1 volts.
Is fixing a ground connection expensive?
Ground circuit repairs are usually inexpensive, typically $50 to $300 including diagnostic time.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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