Code
C2340
HYUNDAI
C — Chassis
Throttle Valve
Views:
UK: 16
EN: 19
RU: 15
AI status
Completed
Completed
100%
Causes
- Open/shorted or corroded wiring or damaged connector at the throttle body
- Faulty electronic throttle body (ETB) motor or throttle position sensor(s)
- Bad accelerator pedal position (APP) sensors or sensor correlation fault
- Blown fuse or faulty relay supplying the throttle control circuit
- Low battery voltage or poor ground connection affecting control electronics
- Carbon build-up or mechanical binding in the throttle plate
Symptoms
- Check Engine Light (MIL) illuminated, stored C2340 code
- Reduced engine power or 'limp' mode with limited RPM/power
- Poor or delayed throttle response, hesitation or surging
- Irregular or high/low idle, stalling at idle
- Faults present in related systems (e.g., ABS/traction) if integrated modules communicate)
What to check
- Retrieve all stored/related DTCs and freeze frame data with a scan tool
- Check battery voltage and charging system health (low voltage can cause false faults)
- Visually inspect throttle body connector and wiring for damage, corrosion, or water intrusion
- Check fuses and relays for the throttle control/ECM circuits
- Measure 5V reference and ground at throttle position sensor connectors
- Compare commanded throttle angle vs actual/throttle position sensor (TPS) values using live data
Signal parameters
- 5V reference supply present at TPS connector (typical 4.8–5.0 V)
- TPS output voltage at closed throttle typically ~0.2–1.0 V and increases with opening (varies by model)
- APP sensor outputs usually 0.5–4.5 V range (two channels for redundancy)
- Motor supply/relay battery voltage ~12 V when commanded (subject to battery state)
- Commanded throttle position vs actual feedback should track closely (no large lag or opposite movement)
Diagnostic algorithm
- Connect a capable scan tool, read and record all codes and freeze frame data. Note related P or C codes.
- Verify battery voltage (engine off and cranking) and restore proper battery charge if low.
- Visually inspect wiring and connectors at the throttle body and accelerator pedal sensor for damage, corrosion, or looseness.
- Check fuses/relays for the ETB/ECM power circuits; replace if faulty.
- With key on (engine off), measure reference voltage and ground at the throttle position sensor and APP sensor connectors. Confirm values are within typical ranges.
- Using live data, compare APP sensor outputs to TPS outputs and to commanded throttle angle. Look for mismatch, stuck values, or intermittent signals.
- Attempt to command the throttle open/closed from the scan tool and observe actual movement. If throttle does not respond electrically but wiring/voltage are correct, suspect throttle motor or internal throttle body failure.
- Inspect throttle plate for carbon build-up and mechanical restriction; clean if necessary following manufacturer procedure.
- Wiggle-test wiring while monitoring live data to check for intermittent faults. Repair any damaged wiring or connectors.
- If electrical checks pass and cleaning does not restore correct operation, consider replacement of the throttle body assembly. After replacement, perform any required throttle/idle relearn or calibration per service manual.
- Clear codes and perform a road/drive cycle to confirm the fault does not return before concluding repair.
Likely causes
- Damaged harness or connector at the throttle body
- Throttle position sensor(s) out of range or intermittent
- Corroded ground or 5V reference supply missing/unstable
- Carbon deposits preventing throttle plate movement
- Failed electronic throttle motor
Fault status
Status
Throttle valve control circuit fault / throttle position discrepancy detected
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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