P0229 Fault Code

P0229 OBD-II Trouble Code Short Description

Throttle Position Sensor/Switch C Circuit Intermittent

What does trouble code P0229 mean?

The P0229 fault code on cars is related to a problem with the fuel pressure regulator circuit. This code typically indicates that the fuel pressure in the fuel rail is too low or too high, which can lead to poor engine performance and fuel economy.

To solve this issue, the fuel pressure regulator may need to be replaced, or the fuel pressure in the system will have to be checked and adjusted as needed. It is also essential to inspect the wiring and connectors associated with the fuel pressure sensor to ensure they are in proper working order.

Failing to address the P0229 fault code can lead to significant issues with engine performance and fuel economy, causing an increase in emissions and fuel consumption, as well as potentially damaging the engine over time. Therefore, it is crucial to address this issue as soon as possible to keep your car running smoothly.

Symptoms of P0229

Here are some of the common symptoms associated with the P0229 fault code:

  • Illuminated MIL or check engine light on the dashboard
  • Reduced engine performance and acceleration
  • Rough idling or stalling
  • Increased fuel consumption
  • Difficulty starting the engine
  • Smoky exhaust or peculiar smell from the exhaust


What causes the P0229 code?

Here are some of the possible causes of the P0229 fault code:

  • Malfunctioning fuel pressure regulator
  • Damaged fuel injector(s)
  • Clogged fuel lines or fuel filter
  • Failing fuel pump
  • Faulty fuel tank pressure sensor
  • Loose electrical connections in the fuel and air metering system
  • Corroded wiring or connectors in the fuel and air metering system
  • Failed engine control module (ECM) or powertrain control module (PCM)

It is important to note that the exact cause of the P0229 fault code can vary depending on the make and model of the vehicle. Therefore, it is recommended to consult the manufacturer's service manual or a licensed mechanic for a proper diagnosis and repair.

Possible Solutions

How to fix P0229?

If you're dealing with a P0229 fault code on your car, it typically indicates a problem with the throttle/pedal position sensor/switch "C" circuit. This circuit sends a signal to the engine control module (ECM) about the position of the throttle/pedal and helps the vehicle regulate its performance and emissions. Here are a few steps you can take to diagnose and fix the issue:

  1. Check the wiring and connections: Start by inspecting the wiring and connections to the throttle/pedal position sensor/switch. Look for any signs of wear, damage, or corrosion that could cause a poor connection. If you find any issues, repair or replace the wiring and connections as needed.

  2. Test the sensor/switch: If the wiring and connections look good, you'll need to test the throttle/pedal position sensor/switch itself. You can do this using a multimeter, following the manufacturer's instructions. Check the resistance values across the various pins on the sensor/switch. Compare the results to the manufacturer's specifications. If the resistance values are outside of the normal range, the sensor/switch is likely faulty and needs to be replaced.

  3. Check the ECM: It's also possible that the issue lies with the ECM itself. To check this, use a scan tool that's compatible with your car's make and model to read the trouble codes stored in the system. Look for any additional codes related to the ECM or throttle control system. If you find any, address those issues first. If everything else checks out, you may need to replace the ECM.

  4. Replace the throttle/pedal position sensor/switch: If you've ruled out wiring and ECM issues and tested the sensor/switch itself, and confirmed that it's faulty, replace the part. You can do this yourself if you're confident in your mechanical abilities, or take your car to a trusted mechanic.

These steps should help you diagnose and fix a P0229 fault code on your car. However, if you're not comfortable doing the work yourself, don't hesitate to take your car to a professional for assistance.