Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic trouble code (DTC) information
Condition
Diagnostic trouble code (DTC) ABS-0030 or ABS-0040 is stored (depending on the wheel sensor) if the control module registers that the signal from the wheel sensor is missing.
Substitute Value
- ABS system is blocked (when the ABS system is blocked the wheels may lock during braking).
- Anti-spin function is blocked.
- EBD function is blocked if two or more sensors are faulty.
Possible Source
- Contact resistance in terminals.
- Open-circuit, short-circuit to ground or supply voltage in power supply to wheel sensor.
- Signal cables short-circuited to each other.
- Short-circuit to supply voltage or ground in the signal cable.
- Open-circuit in the signal cable.
- Defective wheel sensor.
- Defective control module.
Fault symptom[s]
- ABS warning lamp lit.
- Anti-spin warning lamp lit.
- Brake circuit not functioning, warning lamp lit.
- No ABS function.
- Anti-spin does not function.
If the fault becomes intermittent the ABS warning lamp will not go out until the vehicle speed exceeds 20 km/h (12.4 mph) in the next operating cycle.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.