The P20A4 fault code in automobiles refers to a problem with the Reductant Purge Control Valve, which can cause the engine light to turn on. This fault code can be caused by a faulty valve, an open or shorted harness, or poor electrical connections. It is important to address this issue promptly as it can affect the vehicle’s performance and fuel efficiency.

The repair process involves visually inspecting the wiring harness and connectors for damage and checking for broken or corroded pins. The repair time for this issue is estimated to be around 1.0 hour.

To interpret the fault code, it is recommended to check the possible causes listed above.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you notice the Engine Light ON or Service Engine Soon Warning Light, it could be a sign of the p20a4 fault code. Here are the symptoms to look out for:

  • The P20A4 fault code in automobiles can cause the following symptoms: Engine Light ON, Service Engine Soon Warning Light, decreased fuel efficiency, rough idling, engine misfires, reduced engine power, and difficulty starting the engine.
  • It is important to address these symptoms promptly to prevent further damage to the vehicle.

The P20A4 fault code can be caused by a faulty valve, open or shorted harness, or poor electrical connection.

  • The automobile fault code P20A4 can be caused by a faulty Reductant Purge Control Valve.
  • It can also be caused by an open or shorted Reductant Purge Control Valve harness.
  • Additionally, a poor electrical connection in the Reductant Purge Control Valve circuit can also trigger this fault code.

To fix the automobile fault code p20a4, check the possible causes and inspect the related wiring harness and connectors for any damage or corrosion.

  • To fix the automobile fault code P20A4, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The automobile fault code P20A4 can be diagnosed and fixed within an estimated repair time of 1.0 hour.

The cost of repair is influenced by the repair time, which is commonly charged between $75 and $150 per hour by most auto repair shops.

Therefore, the total cost of diagnosis and fixing the P20A4 fault code will depend on the hourly rate charged by the repair shop and the estimated repair time.

The P20A4 fault code indicates that the reductant purge control valve is stuck open. To reverse the reductant flow direction, a 4-2-way valve needs to be switched by a solenoid. The reverting valve functional check monitors the pressure drop when the purge cycle is started.

If the pressure level does not exceed the calibration threshold of 280 kPa at the beginning of the test, the test will not be successful.

If the pressure does not drop by the threshold of 230 kPa within the time, the test will also not be successful.

If the test is not successfully passed, the purge cycle will be terminated immediately to prevent uncontrolled injection of reductant into the exhaust pipe.

What is the possible cause of the P20A4 fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the P20A4 fault code. This code is usually caused by a faulty Reductant Purge Control Valve, an open or shorted harness, or a poor electrical connection in the valve circuit. To fix this issue, you should check the possible causes listed above, visually inspect the related wiring harness and connectors, and look for any damaged components or broken, bent, pushed out, or corroded connector pins.

How can I fix the P20A4 fault code?

If you’re experiencing the P20A4 fault code, indicated by the Engine Light ON or Service Engine Soon Warning Light, it may be due to a faulty Reductant Purge Control Valve, an open or shorted harness, or poor electrical connection. To fix this issue, check the possible causes listed above, visually inspect the related wiring harness and connectors, and look for damaged components or broken, bent, pushed out, or corroded connector’s pins.

What should I visually inspect to troubleshoot the P20A4 fault code?

If you’re experiencing the P20A4 fault code, which is indicated by the engine light or service engine soon warning light turning on, you should visually inspect the wiring harness and connectors related to the Reductant Purge Control Valve. This valve may be faulty, or the harness may be open or shorted, or there may be a poor electrical connection. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins to fix the issue.

p20a4 error fault code explained

If your engine light is on and the code is P20A4, it may be due to a faulty Reductant Purge Control Valve or related wiring issues. Visually inspect the wiring harness and connectors for damage or corrosion.

Check for broken or bent pins.

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