Code
C1199
Generic
C — Chassis
ABS Inlet Valve Coil LF Circuit Open
Views:
UK: 23
EN: 43
RU: 26
AI status
Completed
Completed
100%
Causes
- Broken/disconnected wiring or pin
- Corroded or loose connector at the LF inlet valve
- Open/failed inlet valve coil (solenoid)
- Faulty ABS control module driver (open circuit inside module)
- Blown fuse or related power/ground fault in the ABS supply
Symptoms
- ABS warning lamp illuminated
- Loss of ABS functionality for left-front wheel circuit
- Possible traction control or stability control related warnings
- Brake pedal may feel normal during steady braking but ABS may not engage on that corner
- Stored DTC C1199 (may be accompanied by other ABS-related codes)
What to check
- Read and record all ABS codes and freeze-frame data with a capable scan tool; clear codes and attempt to re-create.
- Visual inspection of harness, connectors, and valve body at left-front wheel area for damage, corrosion or loose pins.
- Check ABS fuses and relays related to pump/valve power and module supply.
- Back-probe the valve connector and check for battery voltage and ground presence with the ABS module commanding the valve.
- Measure coil resistance at the connector (spec varies by vehicle); compare to service data.
- Perform continuity check between valve connector and ABS module connector (pin-to-pin) with ignition off.
Signal parameters
- Coil resistance (typical): commonly in the range 6–30 Ω (vehicle-specific — consult service data).
- Voltage when commanded ON: pulsed drive from ABS module; may measure 0–12 V PWM (duty/frequency vary by system).
- Voltage when OFF: near 0 V (or battery potential on one side depending on driver design); check both supply and ground sides.
- Activation frequency/duty cycle: often modulated (tens to a few hundred Hz) during ABS events — use a scope for waveform verification.
- No continuity/open circuit expected between coil terminals if code is present.
Diagnostic algorithm
- Verify code and note conditions (engine/ignition state, vehicle speed, brake application). Use a scan tool to read related ABS codes.
- Perform a thorough visual inspection of LF valve harness and connector. Repair any obvious damage before further testing.
- Check related fuses/relays and verify ABS module power and ground circuits are present and good.
- With ignition ON (engine off), disconnect the LF inlet valve connector and measure coil resistance across the coil terminals. Compare to factory spec. An open/high reading indicates a bad coil or disconnected lead.
- Back-probe the harness connector at the valve with the connector plugged in. Command the LF inlet valve ON using a scan tool and observe for expected voltage/PWM and ground. No drive indicates an open in wiring or module driver fault.
- If no drive voltage at the harness but coil resistance is normal, perform a continuity test from the harness connector to the ABS module pin. Repair any open/short found in the wiring.
- If wiring and coil are good but no proper module output, suspect internal ABS module driver failure; verify with a known-good module or consult factory diagnostics before replacing.
- After repairs, clear codes and perform road test or ABS activation test to confirm proper operation and that the DTC does not return.
Likely causes
- Damaged harness near wheel or suspension (pinched/chafed)
- Corrosion or water intrusion at the valve connector
- Open coil due to age, overheating, or internal failure
- Connector terminal pushed out or poor crimp
- Failed driver inside ABS module after repeated faults
Fault status
Status
ABS Inlet Valve Coil LF Circuit Open — electrical open detected in left-front inlet (solenoid) valve circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Available brands with manuals
2
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Code
C1199
Other
C — Chassis
ABS Inlet Valve Coil LF Circuit Open
Views:
UK: 21
EN: 47
RU: 26
AI status
Completed
Completed
100%
Causes
- Broken/disconnected wiring or pin
- Corroded or loose connector at the LF inlet valve
- Open/failed inlet valve coil (solenoid)
- Faulty ABS control module driver (open circuit inside module)
- Blown fuse or related power/ground fault in the ABS supply
Symptoms
- ABS warning lamp illuminated
- Loss of ABS functionality for left-front wheel circuit
- Possible traction control or stability control related warnings
- Brake pedal may feel normal during steady braking but ABS may not engage on that corner
- Stored DTC C1199 (may be accompanied by other ABS-related codes)
What to check
- Read and record all ABS codes and freeze-frame data with a capable scan tool; clear codes and attempt to re-create.
- Visual inspection of harness, connectors, and valve body at left-front wheel area for damage, corrosion or loose pins.
- Check ABS fuses and relays related to pump/valve power and module supply.
- Back-probe the valve connector and check for battery voltage and ground presence with the ABS module commanding the valve.
- Measure coil resistance at the connector (spec varies by vehicle); compare to service data.
- Perform continuity check between valve connector and ABS module connector (pin-to-pin) with ignition off.
Signal parameters
- Coil resistance (typical): commonly in the range 6–30 Ω (vehicle-specific — consult service data).
- Voltage when commanded ON: pulsed drive from ABS module; may measure 0–12 V PWM (duty/frequency vary by system).
- Voltage when OFF: near 0 V (or battery potential on one side depending on driver design); check both supply and ground sides.
- Activation frequency/duty cycle: often modulated (tens to a few hundred Hz) during ABS events — use a scope for waveform verification.
- No continuity/open circuit expected between coil terminals if code is present.
Diagnostic algorithm
- Verify code and note conditions (engine/ignition state, vehicle speed, brake application). Use a scan tool to read related ABS codes.
- Perform a thorough visual inspection of LF valve harness and connector. Repair any obvious damage before further testing.
- Check related fuses/relays and verify ABS module power and ground circuits are present and good.
- With ignition ON (engine off), disconnect the LF inlet valve connector and measure coil resistance across the coil terminals. Compare to factory spec. An open/high reading indicates a bad coil or disconnected lead.
- Back-probe the harness connector at the valve with the connector plugged in. Command the LF inlet valve ON using a scan tool and observe for expected voltage/PWM and ground. No drive indicates an open in wiring or module driver fault.
- If no drive voltage at the harness but coil resistance is normal, perform a continuity test from the harness connector to the ABS module pin. Repair any open/short found in the wiring.
- If wiring and coil are good but no proper module output, suspect internal ABS module driver failure; verify with a known-good module or consult factory diagnostics before replacing.
- After repairs, clear codes and perform road test or ABS activation test to confirm proper operation and that the DTC does not return.
Likely causes
- Damaged harness near wheel or suspension (pinched/chafed)
- Corrosion or water intrusion at the valve connector
- Open coil due to age, overheating, or internal failure
- Connector terminal pushed out or poor crimp
- Failed driver inside ABS module after repeated faults
Fault status
Status
ABS Inlet Valve Coil LF Circuit Open — electrical open detected in left-front inlet (solenoid) valve circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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