C2346

Code

HYUNDAI C — Chassis

Supply Valve - Stuck On

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 15 EN: 15 RU: 13

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Page language: EN

Read ABS/ESC module live data with a capable scan tool: observe supply valve status and commanded state
Attempt to actuate the supply valve using the scan tool; listen for valve click and watch live data response
Inspect ABS module / HCU connectors for corrosion, loose pins, or water intrusion
Measure solenoid coil resistance at the valve body connector (compare to service spec)
Check wiring continuity between ABS module and valve connector; inspect for shorts to battery or ground
Check battery voltage and ground quality (low system voltage can cause erroneous behavior)

Solenoid coil resistance: typically a low-ohm value (example range 5–50 Ω) — consult service manual for exact spec
Command signal: module usually drives solenoid with PWM; frequency often tens to hundreds of Hz and varying duty cycle
When commanded OFF: coil should be de-energized (0 V or no PWM at connector); when ON: battery voltage pulses present at connector
Current draw when energized: expected to be moderate — abnormal low (open) or very high (short) indicates fault
No actuator click when commanded but correct voltage present = mechanical seizure; click with no voltage = wiring/module issue

Hook up a scan tool, record freeze frame and all ABS-related codes, then clear codes and perform a test drive to verify recurrence.
With ignition ON, view live data for supply valve actual vs commanded. Command the valve ON/OFF using the tool and note responses.
Visually inspect the ABS/HCU connector and harness for damage, corrosion, or water ingress. Repair any damage found.
Backprobe the valve connector and measure voltage/PWM while commanding the valve ON/OFF. If controller is commanding OFF but valve remains powered, suspect module driver fault or short to B+.
With vehicle off, disconnect the valve body connector and measure coil resistance between the solenoid pins; compare to spec. Open or infinite = open coil; near-zero = shorted coil.
If electrical control appears normal but valve does not move, consider mechanical blockage. Remove and inspect the valve body per service manual; check for debris, rust, or valve sticking.
If wiring and valve coil are OK, test module outputs and grounds. If module driver stage is faulty, replace or repair ABS module per factory procedures.
After repairs or replacement, bleed brake system and perform ABS/ESC module relearn or self-test procedures as required by manufacturer.
Verify repair by clearing codes and re-testing. Ensure no recurrence and that ABS/ESC functions are restored.

⚠️ Status

Supply valve in ABS/HCU is stuck ON (valve remains energized or mechanically held open).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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C2346 — Supply Valve - Stuck On