C1214

Symptoms

• ABS warning light illuminated
• loss of ABS and traction/stability control function
• abnormal braking behavior
• increased emergency stopping distances and higher risk of wheel lockup on slippery surfaces. Basic (non-ABS) braking remains functional.

Probable causes

• 1) Faulty right-front ABS inlet valve solenoid (internal coil open or shorted). 2) Damaged or corroded wiring/connectors in the RF valve circuit. 3) Electrical open/short between the ABS control module and the RF inlet valve coil. 4) On GM and Ford vehicles
• a failed internal EBCM (Electronic Brake Control Module) relay is the primary cause. 5) Low battery voltage or a poor EBCM ground connection can trigger false module faults.

Diagnostic steps

1. Read chassis codes with a capable scanner and note the manufacturer-specific definition for the vehicle.
2. Test the battery — sources call for a minimum of 12.6 volts — and clean the main EBCM frame ground connection to bare metal before condemning any expensive module.
3. Visually inspect the ABS wiring and connectors at the hydraulic unit for damage and corrosion.
4. Test the circuit between the ABS module and the RF inlet valve for opens and shorts.
5. If wiring, power and ground all check good, the fault is internal to the ABS module/EBCM (frequently the internal relay on GM/Ford) — replace or have the module rebuilt.
6. Clear codes and road test to confirm ABS operation.