Code
C2345
HYUNDAI
C — Chassis
Supply Valve - Abnormal
Views:
UK: 12
EN: 15
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or short in supply valve wiring (harness or connector)
- Corroded, loose, or damaged connector at valve or control module
- Supply valve coil internal failure (open, short, or high resistance)
- Valve mechanically seized or obstructed (hydraulic contamination)
- Faulty ABS/ESC control module or driver transistor
- Blown fuse or faulty relay supplying the valve
Symptoms
- ABS/ESC warning lamp illuminated on instrument cluster
- Reduced braking stability interventions (ESC/ABS may be disabled)
- Possible diagnostic trouble codes related to ABS/ESC valves or sensors
- Brakes may feel different (depending on system state)
- Intermittent or permanent fault condition depending on wiring or valve fault
What to check
- Read and record freeze‑frame data and all stored ABS/ESC codes with a scan tool
- Visually inspect valve connector and harness for corrosion, bent pins, or damage
- Check fuses/relays related to ABS/ESC supply circuit
- Verify battery voltage and good chassis/body ground
- Use scan tool to command the supply valve (if supported) and watch status
- Measure voltage at valve power terminal with ignition on and while commanding valve
Signal parameters
- Supply voltage to valve: battery voltage (approx. 11–14 V with engine running) — verify with service manual for exact routing
- Control signal: PWM or switched drive from ABS/ESC module; duty cycle 0–100% when commanded (use scan tool to observe)
- Coil resistance: refer to Hyundai service manual for exact ohm spec; open circuit = infinite Ω, short = near 0 Ω
- Connector continuity: low resistance expected between valve power and module output when connector disconnected
- Current draw: higher than spec may indicate short or internal mechanical blockage (consult manual)
Diagnostic algorithm
- Retrieve all ABS/ESC-related codes and freeze frame using a scan tool. Note if C2345 is current or historic.
- Visually inspect battery, ground(s), fuses, and relays for the ABS/ESC supply circuit. Repair any obvious issues.
- Inspect the supply valve connector and wiring for corrosion, bent pins, chafing, or damage. Wiggle test wiring while monitoring live data to check for intermittent faults.
- With ignition on, measure battery voltage at the valve power terminal. Should read near battery voltage. If no power, trace back to fuse/relay/module.
- Measure control signal at the valve connector while commanding the valve with a scan tool. Verify presence of PWM or on/off command and corresponding voltage changes.
- With the valve disconnected, measure coil resistance and compare to specification. An open or short indicates valve failure.
- If electrical checks pass, inspect hydraulic block for contamination or seizure. If possible, bench-test valve or swap with a known-good unit to confirm operation.
- If wiring and valve check good but fault remains, suspect ABS/ESC control module output stage — perform module diagnostics per Hyundai procedures before replacement.
- After repair, clear codes and road test to verify fault does not return. Re-scan to confirm no new codes.
Likely causes
- Corroded/loose connector at supply valve
- Broken wire or chafed harness to ABS module
- Supply valve coil out of specification (open or shorted)
- Hydraulic contamination or internal valve seizure
- Intermittent ground or weak battery
- Faulty ABS/ESC module output stage
Fault status
Status
Supply valve abnormal — detected electrical or mechanical fault in valve circuit (check wiring, connector, valve coil, hydraulic block, and ABS/ESC module).
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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