Code
C2359
HYUNDAI
C — Chassis
Rear Supply/Exhaust Valve EL
Views:
UK: 24
EN: 31
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or shorted solenoid coil in rear supply/exhaust valve
- Poor connector connection (corrosion, bent pins, water ingress) at valve or ABS module
- Damaged wiring harness (chafing, broken wires, short to ground/12V)
- Poor ground or low battery/charging system voltage during operation
- Faulty ABS/ESC hydraulic control unit (internal driver failure)
- Internal mechanical failure or seizure of valve (interpreted as electrical fault by controller)
Symptoms
- ABS, ESC or traction control warning light illuminated
- Possible loss of ABS/ESC functionality or limited braking control features
- Brake pedal may feel normal when ABS inactive but ABS events may be unavailable
- Diagnostic trouble code stored and may set related limp or warning modes
What to check
- Read ABS/ESC module with an advanced scan tool; record freeze-frame and live data
- Perform actuator/solenoid output tests from scan tool if supported (command rear supply/exhaust valve ON/OFF)
- Visually inspect connector and wiring to rear valve and ABS hydraulic unit for corrosion, damage, water entry, or loose pins
- Measure supply voltage and ground at valve connector with ignition ON and during commanded activation
- Measure coil resistance of the suspect solenoid and compare to manufacturer specification
- Check continuity between valve connector and ABS module pins; wiggle harness to reproduce fault
Signal parameters
- With ignition ON (engine off) expect battery positive at the valve supply terminal (~12 V) and good ground at ground terminal
- When commanded ON by the module, valve driver should switch and you may see switched voltage or ground (varies by design) — confirm with oscilloscope or lab scope if available
- Static solenoid coil resistance should be within manufacturer spec (typical solenoid coils often measure in the single to low tens of ohms); an open (OL) or near-zero short indicates failure
- No large voltage drop between battery and valve connector during activation (
Diagnostic algorithm
- Connect an OEM-capable scan tool and read ABS/ESC codes and live data. Note freeze frame conditions (battery voltage, vehicle speed, temperature).
- Attempt diagnostic actuator test for rear supply/exhaust valve using scan tool. Observe if the module reports successful activation or a driver fault.
- Visually inspect the valve connector and harness for corrosion, water, rodent damage, chafing, and secure terminal pins. Repair any physical damage.
- With harness disconnected, measure solenoid coil resistance at the valve connector. Compare to factory spec; replace valve if open or shorted.
- With connector connected, backprobe supply and driver terminals. Verify constant battery voltage on supply, and that the module provides the switching signal when commanded. Use a lab scope if available to view pulse/ground behavior.
- Check continuity between valve connector and ABS module pins for intermittent shorts or opens. Wiggle harness during monitoring to reproduce fault.
- Verify vehicle battery and charging system voltages are healthy. Low system voltage can cause false errors.
- If wiring and valve are OK but driver output remains inactive or shows short, suspect ABS module driver fault — follow manufacturer procedures for module testing/repair or replacement.
- After repairs, clear codes and perform a road test/exercise ABS to confirm the fault does not return.
Likely causes
- Corroded/loose connector at rear valve or ABS modulator
- Wiring damage to rear valve circuit from road debris or repairs
- Open/short in solenoid coil
- Controller output transistor or driver failure in ABS module
Fault status
Status
Electrical fault detected in rear supply/exhaust valve circuit. ABS/ESC system has limited or disabled hydraulic control until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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