C2355

Code

HYUNDAI C — Chassis

Front Supply/Exhaust Valve EL

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 11 EN: 16 RU: 13

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Page language: EN

Causes

Open or short in valve coil wiring
Corroded or loose connector at valve or hydraulic unit
Failed valve solenoid (coil or internal mechanical seizure)
Faulty ABS/ESC hydraulic control unit or internal driver circuit
Low battery voltage or poor ground
Contaminated or blocked hydraulic passages or valve spool

Symptoms

ABS/ESC/TCS warning lamp illuminated
Reduced or altered braking feel under ABS operation
ABS activation during normal braking or failure to modulate pressure
Brake pulsation or grinding noise from hydraulic unit
Possible illumination of additional chassis system warnings

What to check

Read freeze frame and live data with a capable scan tool; note related codes
Visually inspect valve connector and harness for corrosion, damage, or water ingress
Check battery voltage and chassis ground condition
Measure continuity and resistance of the valve coil at the connector and compare to spec
Check for short to ground or supply on control wiring
Perform a bi-directional (actuator) test of the valve with a scan tool if available

Signal parameters

Valve coil resistance: typically low resistance (range depends on vehicle; expect a few ohms to tens of ohms) — compare to service spec
Supply voltage to hydraulic unit: ~11–14 V with key ON (engine off) — verify stable supply and ground
Control signal: ECU may use PWM to command valve (0–100% duty cycle) — frequency varies by model
No continuity or infinite resistance indicates open coil; near short-to-ground indicates shorted coil or wiring fault

Diagnostic algorithm

Retrieve and record all related DTCs and freeze-frame data. Clear codes and see if C2355 returns.
Perform a visual inspection of the ABS/hydraulic unit connector and wiring for damage, corrosion, or water entry.
With ignition OFF, disconnect the valve electrical connector and measure coil resistance between valve pins. Compare to service specification.
Check continuity from the valve connector to the ABS module connector for opens/shorts; check for short to ground and short to battery.
With ignition ON, back-probe connector and verify supply voltage and ground at the valve connector. Observe while commanding valve via scan tool to see PWM or switching behavior.
If electrical tests are good, perform a scan-tool bi-directional (actuator) test to operate the valve and listen/feel for operation; monitor live data for expected responses.
If valve does not operate electrically but wiring and module outputs are correct, bench-test or replace the valve solenoid (or hydraulic unit) as per service manual.
If valve and wiring check out but code persists, suspect internal ABS module driver failure — consult technical service info before module replacement.
After repair, clear codes and perform a road test with ABS activation scenarios to confirm fault does not return.

Likely causes

Damaged/shorted harness to front supply/exhaust valve
Corroded connector pins at the hydraulic unit
Valve solenoid open-circuit or low insulation (coil failure)
ABS module driver transistor fault
Hydraulic contamination causing valve to stick

Fault status

⚠️ Status

Front supply/exhaust valve (electronic) fault detected. Electrical open/short, connector/circuit issue, valve failure, or internal hydraulic unit driver error may prevent proper front brake pressure modulation.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours

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