The P2420 fault code in automobiles refers to a problem with the vacuum pump module. The most common symptom is the illumination of the engine light or service engine soon warning light. The cause of this issue could be a faulty vacuum pump module, an open or shorted vacuum pump module harness, a poor electrical connection in the vacuum pump module circuit, or a faulty engine control module (ECM).

The importance of repairing this issue lies in the fact that it can affect the performance of the vehicle.

The difficulty level of the repair is moderate, and it takes around 1.0 hour to fix. To interpret the fault code, one needs to check the possible causes listed above and visually inspect the related wiring harness and connectors.

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 p2420 fault code.

Here are the symptoms to look out for:

  • The P2420 fault code in an automobile can cause several symptoms.
  • The most common symptom is the illumination of the engine light or service engine soon warning light.
  • Other symptoms include reduced engine power, decreased fuel efficiency, and difficulty starting the engine.
  • The vehicle may also experience rough idling or stalling.
  • Additionally, the exhaust system may emit a strong odor or produce excessive smoke.
  • If you notice any of these symptoms, it is important to have your vehicle diagnosed and repaired by a qualified mechanic as soon as possible.

The automobile fault code p2420 can be caused by a faulty vacuum pump module, open or shorted harness, poor electrical connection, or a faulty engine control module (ECM).

  • The automobile fault code P2420 can be caused by a faulty Vacuum Pump Module.
  • It can also be caused by an open or shorted Vacuum Pump Module harness.
  • Another cause can be a poor electrical connection in the Vacuum Pump Module circuit.
  • Lastly, a faulty Engine Control Module (ECM) can also trigger the P2420 fault code.

Below are some possible fixes for the automobile fault code p2420, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code p2420, you need to check the possible causes listed above.
  • Visually inspect the related wiring harness and connectors.
  • Look for 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 P2420 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the hourly rate charged by the auto repair shop, which typically ranges between $75 and $150 per hour. Therefore, the total cost of diagnosing and fixing the P2420 fault code will depend on the hourly rate charged by the auto repair shop and the estimated repair time required to fix the issue.

The P2420 code is related to the Evaporative Emission (EVAP) system in automobiles.

The code is triggered when the Engine Control Module (ECM) detects a malfunction in the EVAP system’s switching valve control circuit.

This malfunction occurs when the difference in EVAP pressure in the system is small and does not increase more than 2.25 mmHg (0.3 kPa) within 10 seconds of changing the vent valve from OFF to ON.

This indicates that the vent valve is stuck OFF, causing the ECM to illuminate the Malfunction Indicator Lamp (MIL) and set the Diagnostic Trouble Code (DTC) P2420.

What are the possible causes of the automobile fault code P2420?

If you see the engine light on or service engine soon warning light, it could be due to the P2420 fault code. This code is usually caused by a faulty vacuum pump module, an open or shorted vacuum pump module harness, poor electrical connection in the vacuum pump module circuit, or a faulty engine control module (ECM). To fix this issue, you should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

How can one visually inspect the related wiring harness and connectors to fix the P2420 fault code?

If you’re experiencing an Engine Light ON or Service Engine Soon Warning Light due to a P2420 fault code, there are a few possible causes to consider. One of them is a faulty Vacuum Pump Module, which can be fixed by visually inspecting the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. It’s important to check all the possible causes listed above to ensure a proper fix.

Is a faulty Engine Control Module (ECM) a common cause of the P2420 fault code?

While a faulty Engine Control Module (ECM) is listed as a possible cause of the P2420 fault code, it is not a common cause. The most common cause of this code is a faulty Vacuum Pump Module or issues with its wiring harness or electrical connections. To fix the issue, it is recommended to visually inspect the related wiring harness and connectors, checking for any damage or corrosion.

p2420 error fault code explained

If your engine light is on, it could be due to a faulty Vacuum Pump Module, open or shorted harness, poor electrical connection, or a faulty Engine Control Module.

Check for damaged components and inspect the wiring harness and connectors for any issues.

Scroll to Top