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Home / DTC / C2112 — Valve Relay Or Fuse-Fail. | Valve Relay Error | Main Relay Circuit

C2112 — Valve Relay Or Fuse-Fail. | Valve Relay Error | Main Relay Circuit

Detailed page for trouble code C2112.

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Code

C2112

HYUNDAI C — Chassis

Valve Relay Or Fuse-Fail. | Valve Relay Error | Main Relay Circuit

Brand: HYUNDAI
Type: C — Chassis
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Page language: EN

Causes

  • Blown fuse in the main relay/pump/valve circuit
  • Faulty valve or pump relay (coil or contacts failed)
  • Open or shorted wiring between relay, fuse, module and hydraulic valve/pump
  • Poor or corroded connector pins at relay, fuse block, valve or control module
  • Failed hydraulic modulator, ABS pump motor or valve solenoid drawing abnormal current
  • Faulty body or ABS control module driver circuit

Symptoms

  • ABS, ESC or VDC warning lamp illuminated
  • Loss of ABS pump operation or no pump noise when system is commanded
  • Traction control and stability systems disabled
  • Fault stored in ABS/BCM with possible reduced braking/traction functionality
  • Intermittent or permanent inoperative ABS pump/valve operation

What to check

  • Retrieve all stored DTCs and freeze frame data with a capable scan tool; note related codes
  • Visual inspection of related fuses and relay (look for blown fuse, melted relay, corrosion)
  • Listen for relay click when system/ignition is cycled or ABS pump is commanded
  • Check fuse continuity and relay socket for power/ground with key ON and engine cranking
  • Inspect wiring harness and connectors for damage, corrosion, or water entry
  • Backprobe relay control and output terminals to confirm presence/absence of voltage

Signal parameters

  • Battery supply to relay/fuse: ~12 V with ignition ON (should be battery voltage)
  • Relay coil control signal: 0 V (ground) or +12 V depending on vehicle design when energized — verify against wiring diagram
  • Fuse continuity: near 0 Ω when intact
  • Relay coil resistance: continuity present (typical coil resistance varies by relay type — expect tens to hundreds of ohms)
  • Pump/valve power feed terminal: battery voltage present when relay is energized
  • Ground circuits: low resistance to chassis ground (< 1 Ω typical)

Diagnostic algorithm

  1. Safety first: Park on level surface, key OFF, chock wheels, disconnect battery only if advised by repair manual for electrical work.
  2. Read DTCs with scan tool and record all codes, freeze frame and live data related to ABS/VDC/BCM.
  3. Perform a visual inspection of the fuse/relay box, associated fuses and relay for signs of blown fuse, heat damage, corrosion or water entry.
  4. Check the specific fuse for continuity with a multimeter; replace fuse if blown and retest. If fuse blows again immediately, suspect short or high current draw.
  5. With ignition ON, probe the relay socket: verify constant 12 V feed to the common terminal and correct control signal to the coil terminal when the module commands the relay (use wiring diagram to identify pins).
  6. If relay does not actuate, swap with identical known-good relay and recheck operation. If relay swap fixes symptom, replace relay.
  7. If relay energizes but pump/valve does not run, measure voltage at the pump/valve power terminal when relay is energized. No voltage indicates wiring or relay contact issue.
  8. Check ground at the pump/modulator and relay ground point. Repair any high-resistance grounds or corroded connections.
  9. If fuse blows on replacement or abnormal current draw is measured at the pump/valve, isolate and test the pump/valve for shorts or mechanical seizure; disconnect pump and test current draw from harness.
  10. Inspect and test wiring harness for opens/shorts between the relay/fuse and the hydraulic modulator; repair any damaged wiring.
  11. If wiring, relay and pump check good but code persists, test the control module driver output (voltage or ground switching) and communication lines; consult model-specific wiring diagrams and module test procedures.
  12. After repairs, clear codes and perform a road or functional test while monitoring live data to ensure the system returns to normal and no new faults set.

Likely causes

  • Blown fuse in the main relay circuit
  • Faulty relay (no click / intermittent contact)
  • Open/shorted wiring or poor ground at relay/fuse/valve connector
  • Corroded connector or water ingress at valve/pump or fuse box

Fault status

⚠️ Status
Valve relay or fuse failure detected in main relay circuit. Check main fuse, valve/pump relay, wiring and connectors for open, short or corrosion. Verify relay operation and supply/ground voltages. Replace faulty relay/fuse or repair wiring as required; if electrical paths are good, inspect control module outputs.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

C2110 C2111 C2100 C1221 C1260
371

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