Code
C2344
HYUNDAI
C — Chassis
Supply Valve
Views:
UK: 13
EN: 24
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or short in supply valve wiring or connector
- Corroded, loose or damaged connector pins
- Faulty supply valve solenoid in the hydraulic control unit (HCU/modulator)
- Faulty ABS/ESC control module (driver/ECU)
- Blown fuse or poor ground related to ABS/ESC
- Intermittent connection due to wiring chafe or water intrusion
Symptoms
- ABS warning lamp illuminated
- ESC/Traction control warning lights may also be on
- Loss of ABS or ESC function; braking feels normal but ABS may not engage
- Possible pulsation or unusual brake pedal feel during ABS events
- Stored related ABS/ESC trouble codes
What to check
- Scan ABS/ESC module for C2344 and any additional codes
- Visually inspect wiring and connectors at the hydraulic unit for damage, corrosion, and secure fit
- Check related fuses and ABS module power/ground circuits
- Backprobe connector and verify supply valve coil resistance and applied voltage with ignition ON and during commanded activation
- Check for water intrusion or contamination at the HCU connector
- Confirm hydraulic leaks or visible damage to the HCU
Signal parameters
- Supply valve coil resistance: typically low to moderate (example 5–50 ohms) — consult service manual for exact spec
- Controller output: typically switched +12V or PWM from 0–12V when commanded (verify with scope or DVOM while commanding)
- Ground continuity: close to 0 ohms to vehicle chassis ground
- When commanded ON by ABS unit, voltage at the valve connector should change (steady or PWM depending on design)
- No-load current draw: solenoid should draw current consistent with coil resistance (use service data)
Diagnostic algorithm
- Retrieve freeze frame and semua ABS/ESC codes with scan tool; note conditions.
- Perform a visual inspection of the HCU connector, wiring harness, and nearby components for damage or corrosion.
- Verify fuses and measure battery voltage at ABS module connector; check module ground integrity.
- With ignition ON, backprobe valve connector and measure coil resistance (engine off). Compare to service spec; high/OL indicates open coil.
- Command the supply valve ON/OFF with a bi-directional scan tool while monitoring voltage/current at the valve connector. Verify ECU output changes and solenoid response.
- If ECU commands but no correct voltage at valve, trace and repair wiring (short/open/poor ground) and retest.
- If correct voltage is present but coil resistance is out of spec or valve does not actuate, replace or rebuild the hydraulic control unit (confirm with manufacturer procedure).
- If wiring and valve check OK, perform module bench test or replace ABS control module per service manual.
- After repairs, clear codes, perform ABS self-test and road test to confirm no recurrence. Bleed brake system if HCU was opened or replaced.
- Always follow vehicle-specific service manual precautions when working on high-pressure hydraulic and ABS components.
Likely causes
- Damaged wiring or poor connector at supply valve (most common)
- Corroded connector or pin contact
- Failed supply valve solenoid inside the ABS hydraulic unit
- Faulty ABS control module (less common)
Fault status
Status
Supply valve circuit malfunction detected by ABS/ESC control module. Check valve, wiring, connector, and control unit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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