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Home / DTC / C1229 — Throttle Valve Assembly Electrical.

C1229 — Throttle Valve Assembly Electrical.

Detailed page for trouble code C1229.

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Code

C1229

HYUNDAI C — Chassis

Throttle Valve Assembly Electrical.

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 16 EN: 29 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring in throttle assembly/PCM circuit
  • Corroded, loose or damaged connector at throttle body
  • Faulty electronic throttle body (throttle actuator motor or internal sensors)
  • Faulty accelerator pedal position sensor(s) or sensor correlation error
  • Blown fuse or poor battery/ignition power to throttle assembly
  • PCM/ECM internal fault or software anomaly

Symptoms

  • Check Engine Light or malfunction indicator illuminated
  • Reduced engine power / limp-home mode
  • Poor throttle response, hesitation or surging
  • Inability to accelerate normally or limited engine RPM
  • Engine may idle poorly or stall in extreme cases

What to check

  • Read all stored and pending DTCs with a scan tool and note freeze-frame data
  • Check for related codes (throttle, APP, CAN, powertrain) and address those first
  • Visually inspect throttle body connector and wiring harness for damage, corrosion, chafing or pinched wires
  • Check fuses and ignition-switched power to throttle body
  • Verify battery voltage and charging system health
  • With key on (engine off) monitor throttle position and accelerator pedal sensor values via live data and compare to expected ranges

Signal parameters

  • Throttle position sensor (TPS) signal range: 0–5 V (closed to wide open)
  • Idle TPS voltage typically low (~0.2–1.0 V) and increases smoothly to ~4–5 V at wide open (refer to model-specific specs)
  • Accelerator pedal position sensor(s): 0–5 V reference, two sensors should correlate/validate each other
  • Throttle motor supply: battery/ignition-switched voltage (~12 V) for motor power and a control/PWM signal from PCM (PWM frequency varies by model)
  • No short to ground or battery on sensor reference or signal circuits; wiring continuity to PCM should be intact

Diagnostic algorithm

  1. Connect a capable scan tool, read and record all DTCs and freeze-frame data. Note any related P/C/U codes. 2) Visually inspect the throttle body, connector, and wiring harness for damage, corrosion, or connector pins pushed out. Repair as needed. 3) Verify battery voltage (>12 V) and charging system before electrical tests. 4) With scan tool, compare accelerator pedal position sensor(s) and throttle position sensor values at key on (engine off) and with pedal applied — check for smooth, correlated changes and no dropouts. 5) Check power and ground at the throttle body connector: verify that reference (5 V) and ground are present and stable. 6) Back-probe throttle motor supply and control circuits while commanding throttle via a scan tool (if allowed) to observe PWM/control signals and motor response. 7) Perform continuity and resistance checks of wiring between throttle body and PCM; repair any opens/shorts. 8) If signals and wiring are within specs but fault persists, follow manufacturer procedure to test/bench the throttle body or replace the throttle assembly. 9) After repair or replacement, clear codes and perform throttle relearn/idle adaptation per service manual, then road test to confirm. 10) If replacing parts does not clear the fault, investigate PCM/software updates or intermittent CAN/bus communication faults.

Likely causes

  • Poor connector contact or corrosion at throttle body
  • Intermittent wiring short to ground or battery voltage on throttle motor supply
  • Failure of throttle actuator motor or internal position sensor
  • Accelerator pedal sensor mismatch/failure causing implausible signal
  • Low battery voltage or weak charging system during operation

Fault status

⚠️ Status
Electrical fault detected in the throttle valve assembly or its control circuit. The engine control module has logged an abnormal electrical condition (open, short, implausible signal or actuator failure) affecting throttle control. May result in reduced power and require throttle relearn after repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2101 P2106 P2119 P2135 P0120 P0220
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Code

C1229

Other C — Chassis

Speed Wheel Sensor Rear Center Coherency Fault

Brand: Other
Type: C — Chassis
Views: UK: 17 EN: 41 RU: 32
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring in throttle assembly/PCM circuit
  • Corroded, loose or damaged connector at throttle body
  • Faulty electronic throttle body (throttle actuator motor or internal sensors)
  • Faulty accelerator pedal position sensor(s) or sensor correlation error
  • Blown fuse or poor battery/ignition power to throttle assembly
  • PCM/ECM internal fault or software anomaly

Symptoms

  • Check Engine Light or malfunction indicator illuminated
  • Reduced engine power / limp-home mode
  • Poor throttle response, hesitation or surging
  • Inability to accelerate normally or limited engine RPM
  • Engine may idle poorly or stall in extreme cases

What to check

  • Read all stored and pending DTCs with a scan tool and note freeze-frame data
  • Check for related codes (throttle, APP, CAN, powertrain) and address those first
  • Visually inspect throttle body connector and wiring harness for damage, corrosion, chafing or pinched wires
  • Check fuses and ignition-switched power to throttle body
  • Verify battery voltage and charging system health
  • With key on (engine off) monitor throttle position and accelerator pedal sensor values via live data and compare to expected ranges

Signal parameters

  • Throttle position sensor (TPS) signal range: 0–5 V (closed to wide open)
  • Idle TPS voltage typically low (~0.2–1.0 V) and increases smoothly to ~4–5 V at wide open (refer to model-specific specs)
  • Accelerator pedal position sensor(s): 0–5 V reference, two sensors should correlate/validate each other
  • Throttle motor supply: battery/ignition-switched voltage (~12 V) for motor power and a control/PWM signal from PCM (PWM frequency varies by model)
  • No short to ground or battery on sensor reference or signal circuits; wiring continuity to PCM should be intact

Diagnostic algorithm

  1. Connect a capable scan tool, read and record all DTCs and freeze-frame data. Note any related P/C/U codes. 2) Visually inspect the throttle body, connector, and wiring harness for damage, corrosion, or connector pins pushed out. Repair as needed. 3) Verify battery voltage (>12 V) and charging system before electrical tests. 4) With scan tool, compare accelerator pedal position sensor(s) and throttle position sensor values at key on (engine off) and with pedal applied — check for smooth, correlated changes and no dropouts. 5) Check power and ground at the throttle body connector: verify that reference (5 V) and ground are present and stable. 6) Back-probe throttle motor supply and control circuits while commanding throttle via a scan tool (if allowed) to observe PWM/control signals and motor response. 7) Perform continuity and resistance checks of wiring between throttle body and PCM; repair any opens/shorts. 8) If signals and wiring are within specs but fault persists, follow manufacturer procedure to test/bench the throttle body or replace the throttle assembly. 9) After repair or replacement, clear codes and perform throttle relearn/idle adaptation per service manual, then road test to confirm. 10) If replacing parts does not clear the fault, investigate PCM/software updates or intermittent CAN/bus communication faults.

Likely causes

  • Poor connector contact or corrosion at throttle body
  • Intermittent wiring short to ground or battery voltage on throttle motor supply
  • Failure of throttle actuator motor or internal position sensor
  • Accelerator pedal sensor mismatch/failure causing implausible signal
  • Low battery voltage or weak charging system during operation

Fault status

⚠️ Status
Electrical fault detected in the throttle valve assembly or its control circuit. The engine control module has logged an abnormal electrical condition (open, short, implausible signal or actuator failure) affecting throttle control. May result in reduced power and require throttle relearn after repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2101 P2106 P2119 P2135 P0120 P0220
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