P0229 – Throttle/Pedal Position Sensor/Switch C, open circuit
OBD2 Error Codes

P0229 – Throttle/Pedal Position Sensor/Switch C, open circuit

18.09.2023 /

P0229 – technical description of the OBD-II fault code

Throttle/pedal position sensor/switch C intermittent

What does DTC P0229 mean?

When a turbocharged engine is running normally, pressurized air produces maximum power.

A turbocharger, activated by exhaust gases, forces air into the intake, and compressors are driven by belts to increase air pressure.

If this system fails, trouble code P0299 will appear, indicating low boost pressure.

This code will activate the check engine light and can put the vehicle into limp mode for protection.

P0229 is an OBD-II code indicating a problem with the throttle/pedal sensor/switch C circuit.

What are the symptoms of trouble code P0229?

Indicators:

  • The Check Engine Light and Electronic Throttle Control (ETC) light will illuminate.

Throttle valve operating mode:

  • The throttle is completely disabled during stopping to prevent over-revving when the vehicle is stopped.
  • The throttle can be set to a fixed position during acceleration to limit throttle opening.

Symptoms:

  • Inaction or erratic braking when braking due to a closed throttle position.
  • Very poor throttle response during acceleration or no throttle response at all, limiting acceleration.
  • Vehicle speed will be limited to 32 mph or less.
  • Symptoms may go away if the vehicle is restarted, but the check engine light will remain on until repairs are made or the codes are cleared.

Additional symptoms:

  • Make sure the engine light is on.
  • Some vehicles may go into limp mode.
  • Lack of engine power.
  • Mechanical noise (turbine/compressor malfunction).
  • Very low power.
  • Engine warning light on the dashboard.
  • Unusual sounds while the car is moving (as if something is loose).

Possible reasons

  1. Unstable input voltage from the sensor circuit to the ECM due to corrosion or loose connections.
  2. Turbine or compressor malfunctions.
  3. Low engine oil pressure.
  4. Error in the EGR system.
  5. Air leak or restriction.
  6. Faulty boost pressure sensor.
  7. Faulty injector control pressure sensor.
  8. EGR system malfunctions.
  9. Mechanical condition of the engine.
  10. Faulty turbo/compressor.
  11. Low oil pressure.
  12. Loss of intake air or air restriction.

How to diagnose error P0229

Instructions for diagnosing code P0299 OBD-II:

1. Connect the scanner and scan the codes:

   – Connect the scanner to your vehicle's OBD-II port and scan for trouble codes.

   – Record all freeze frame data, including the conditions at the time the code was set.

2. Clear codes and test drive:

   – Clear engine and ETC (Electronic Throttle Control) fault codes and make sure the problem does not return.

   – Take a test drive for further verification.

3. Check the wiring and connections of the sensors:

   – Visually inspect the wiring and connections of the throttle body sensors for looseness or corrosion.

4. Check the stability of the sensor signal voltage:

   – Check the scan data to ensure the sensor signal voltage is stable.

   – Perform a wobble test on the connector and wiring to pinpoint the cause of the intermittent connection problem.

5. Check the sensor:

   – Disconnect and test the resistance of the sensor to determine if it has an intermittent internal circuit failure.

   – Simulate a road bump by pressing the throttle and lightly touching the sensor.

6. Visual inspection and scanning:

   – Perform a visual inspection of the turbocharger system, intake system, EGR system and other related systems.

   – Use scanning tools to check that the boost pressure readings are correct.

7. Checking mechanical systems:

   – Check all mechanical systems such as the turbine or supercharger, oil pressure and intake system for leaks or restrictions.

8. Solving other fault codes:

   – If there are other OBD-II DTCs, have them repaired or repaired as the P0299 code may be caused by other systems being faulty.

9. Search Technical Service Bulletins (TBS):

   – Find the Technical Service Bulletins for your vehicle brand and follow the on-screen instructions to resolve the OBD-II trouble code.

10. Checking the air intake system:

    – Inspect the air intake system for cracks and disconnected hoses.

11. Checking the turbocharger relief valve throttle solenoid:

    – Check that the turbocharger relief valve throttle solenoid is operating correctly.

12. Additional diagnostics:

    – If the air intake system is operating normally, check the boost pressure regulator, wastegate, sensors, regulators and other components.

Diagnostic errors

Properly performing all diagnostic steps in the correct sequence is key to avoiding errors and accurately diagnosing a P0299 code, which can have a variety of symptoms and causes.

How serious is trouble code P0229?

The severity of this error can range from moderate to severe. If you wait to fix this problem, you could end up with more serious and costly damage.

FIXING (error code P0299) low boost turbocharger supercharger “underboost condition”

What repairs can fix code P0229

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