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Speed Wheel Sensor LF Input Short Circuit To Ground

Jump to the fix

Severity

High

Can I keep driving?

Avoid extended driving; visit a service soon.

First step

Measure parasitic drain with the ignition off and check whether the hydraulic unit stays warm; both symptoms point at a permanently live circuit

  • CChassis
  • 1Manufacturer-specific
  • 1Chassis / ABS
  • 91Sequence number

What does it mean?

C1191 is a Chassis (ABS, traction control, steering) fault code. It indicates: ABS Hydraulic Valve Power Relay Circuit Short to Battery . 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 lamp on with the traction and stability control lamps, sometimes with a brake system warning
  • ABS is inactive: no pedal pulsing and no wheel speed regulation during an emergency stop
  • Humming or buzzing from the ABS hydraulic unit after the key has been removed
  • Battery drains overnight or over a few days of standing
  • Hydraulic unit warm to the touch after the vehicle has been parked, because the valves stay energised

Likely causes

  • Relay contacts welded closed so the valve supply is live all the time
  • Chafed insulation letting a permanently powered wire touch the relay control or feedback line
  • Water and corrosion in the fuse box bridging a live terminal to the ABS circuit
  • Wrong relay fitted or a relay inserted into an adjacent slot during previous work
  • Aftermarket accessory, alarm or trailer wiring spliced into the ABS harness
  • Loom damaged where it runs past the battery, starter cable or a main junction point
  • Internal fault in the ABS module output stage keeping the line pulled high

How to fix it

  1. Measure parasitic drain with the ignition off and check whether the hydraulic unit stays warm; both symptoms point at a permanently live circuit
  2. Read the full chassis code list; several short to battery codes at once indicate one shared feed problem
  3. Remove and bench test the relay for welded contacts, and check that the correct relay is in the correct slot
  4. Inspect the relay and fuse box for water ingress, salt deposits and carbon tracking between adjacent live terminals
  5. With the relay out and the ABS module unplugged, measure the control wire for voltage; any reading proves an external feed
  6. Follow the harness for chafe against live cables and inspect every non-factory connection in the engine bay
  7. Repair or reroute the damaged wiring, fit a correct relay, and only then consider ABS module repair or coded replacement

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.