What does it mean?
C1194 is a Chassis (ABS, traction control, steering) fault code. It indicates: ABS Hydraulic Valve Power Relay Circuit Open . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms
- ABS, traction and stability control lamps lit as soon as the ignition is switched on
- No valve click or pump noise during the ABS self-test at start-up
- ABS never engages: the pedal stays hard and a wheel can lock in an emergency stop
- Normal service braking is unaffected, so nothing feels wrong until a panic stop is needed
- Traction control, hill-start assist and electronic brake force distribution are all disabled
Likely causes
- Blown high current fuse on the ABS valve supply
- Valve relay coil or contact set open internally, or the relay not fully pushed into its socket
- Break in the supply wire between the relay, the fuse box and the hydraulic unit, usually at a bend or a body pass-through
- Terminal corroded or backed out inside the ABS module connector, interrupting the feed to the valve coils
- Ground stud for the hydraulic unit loose, rusted or painted over
- Earlier repair work in the area that cut, stretched or unplugged part of the ABS loom
- Open track or broken solder joint on the ABS module board where the valve supply enters
How to fix it
- Test all ABS fuses with a meter, including the large power fuses in the underbonnet box
- Read the complete code list; if every valve circuit reports a fault at once, look for the missing common supply rather than failed coils
- Confirm the relay is correct and fully seated, then try a known good identical relay
- With the ignition on, measure voltage at the relay socket to identify whether the feed side or the switched side is dead
- Check continuity from the fuse output to the ABS module connector, splitting the run into sections to locate the break
- Inspect the module connector for water, corrosion and displaced pins, and clean and retighten the ABS ground point
- Repair the open circuit; consider ABS module repair or coded replacement only after the external wiring is proven good