Code
C2354
HYUNDAI
C — Chassis
Front Supply/Exhaust Valve ST
Views:
UK: 14
EN: 13
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or short in valve wiring harness
- Corroded/loose connector at the valve or ABS module
- Failed supply/exhaust solenoid (stuck or internally shorted)
- Contamination or internal hydraulic seizure in the ABS hydraulic unit
- Faulty ABS/ESC control module
- Low battery voltage or blown fuse affecting valve supply
Symptoms
- ABS and/or ESC warning light illuminated
- Possible traction control warning
- Loss of ABS function; ABS may not engage under braking
- Unusual pump or valve noise from the ABS unit during activation
- Brake pedal feel may change during ABS operation
- Diagnostic trouble codes for other ABS valves or sensors may be present
What to check
- Scan and record all ABS/ESC codes and freeze-frame data; clear codes and see if C2354 returns
- Visually inspect ABS hydraulic unit, connectors, and wiring for damage, corrosion, or water ingress
- Check battery voltage and fuses related to ABS/ESC
- Backprobe valve connector: check for battery feed and ground presence when commanded by scan tool
- Measure coil resistance of the front supply/exhaust valve and compare with manufacturer spec
- Perform wiggle test on wiring while monitoring live data for intermittent changes
Signal parameters
- Supply voltage to valve: ~12 V (should be near battery voltage when fused feed is present)
- Valve coil resistance: typically low ohms (model dependent) — check OEM spec (common range ~5–30 Ω)
- Actuation control: PWM or switched feed from ABS module (duty cycle varies with command)
- Activation current: typically tenths to a few amps when energized (measure with appropriate clamp meter)
- Module diagnostic response: commanded ON/OFF should change current draw and valve state in live data
Diagnostic algorithm
- Read and record ABS/ESC codes and freeze-frame data with a capable scan tool.
- Perform a visual inspection of the ABS hydraulic unit, valve connectors and associated wiring for damage, corrosion, or water intrusion.
- Verify battery voltage and check ABS-related fuses and relays.
- Backprobe the front supply/exhaust valve connector: verify constant power (if applicable), switched power/diagnostic feed and ground reference while commanding the valve with a scan tool.
- Measure resistance of the valve coil at the connector; compare to OEM specification.
- Command the valve ON/OFF with a scan tool while monitoring voltage/current and listen for valve operation. Note any lack of response or abnormal current.
- If wiring and control signals are good but valve does not operate, consider valve internal failure or hydraulic seizure — inspect hydraulic unit for contamination and metal particles.
- If valve is faulty, replace the valve or hydraulic control assembly per vehicle service manual. Perform required brake system bleeding and ABS module initialization/calibration if replaced.
- After repairs, clear codes, perform functional tests and a road test to confirm ABS/ESC operation and that the code does not return.
Likely causes
- Damaged wiring/connector to the front supply/exhaust valve
- Faulty solenoid within the ABS hydraulic block
- Corrosion or water ingress at the valve connector
- Contaminated brake fluid or debris causing valve to stick
Fault status
Status
Front supply/exhaust valve circuit fault detected (electrical or mechanical). ABS/ESC may be limited or disabled until repaired.
Repair difficulty: Hard
Diagnostic time: 2.0-6.0 hours
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