ABS System Control Circuit
The C0030 code means the vehicle's onboard diagnostic system has detected: ABS System Control Circuit. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $1200 (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
- Traction control disabled
- Stability control light on
- Multiple ABS codes may be stored
Probable Causes (Ranked by Likelihood)
- ABS control module malfunction Very High
- Wiring harness damage to ABS system High
- Electrical interference from other systems Moderate
- Faulty vehicle speed signal Low
Step-by-Step Diagnostic Procedure
-
Read all stored codes from every module
-
Check ABS module supply voltage and ground
-
Inspect main ABS wiring harness for damage
-
Check for electrical interference from aftermarket accessories
Frequently Asked Questions
What is the ABS system control circuit?
The main control circuitry within the ABS module that manages all ABS functions.
Can aftermarket accessories cause this code?
Yes, poorly installed electronics can cause electrical interference disrupting ABS operation.
Is this always a module replacement?
Not always. Wiring and power supply problems can cause this code too.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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