What is P2421 : Engine Error code Causes Explained
The P2421 engine trouble code indicates a low-temperature diesel particulate filter (DPF) system malfunction. This issue may hinder DPF regeneration, reducing vehicle emissions and performance.
How to Identify a DTCs Number
The DTC code P2421 is related to the evaporative emission control system. It typically occurs when the system detects an issue with the fuel vapor canister or its purge valve.
Understand, this trouble codes (DTCs) are 5 characters: 1 letter, 4 numbers. P-Powertrain indicates the fault code’s location. Generic or manufacturer-specific codes are indicated by the first digit. The second digit denotes the subsystem (7=transmission). The last two numbers describe the issue.
To identify a DTC’s number, you can use an OBD-II scanner to access the vehicle’s computer system. The scanner will read the error codes stored in the vehicle’s memory, providing the DTC number.
Causes of P2421 Error Code:
- Faulty Vent Valve:
The valve may be stuck open due to wear, contamination, or electrical failure. - Clogged or Dirty Canister.
A saturated or clogged charcoal canister can affect valve function. - Faulty Purge Valve:
A malfunctioning purge valve can cause irregular vacuum pressure. - Wiring Issues:
Damaged or corroded wiring to the vent valve can disrupt signal transmission. - ECU/PCM Software Issues:
The engine control unit may not be properly regulating the EVAP system.
Risk Level of P2421 Error Code:
The P2421 engine error code typically indicates an issue with the evaporative emissions system, specifically related to the fuel tank pressure sensor or its circuit.
When the error code is categorized as a “Medium-risk level,” it suggests that the problem isn’t immediately catastrophic but could lead to more significant issues if left unresolved.
Common Car Brands Affected by P2421 Code:
The P2421 engine error code is commonly found in the following list.
- Ford
- Mitsubishi
- Volkswagen
- Honda
- Chevrolet
- BMW
- Toyota
Video: P2421 Engine Error code
FAQ’s
What is the P2421 Engine Error Code?
The P2421 code indicates a problem with the diesel particulate filter (DPF) sensor, specifically related to the sensor’s input or output circuit, which monitors the soot level in the DPF.
What Causes the P2421 Engine Error Code?
The most common causes include a faulty DPF sensor, damaged wiring or connectors, or a malfunction in the exhaust system. It could also be triggered by a buildup of soot in the filter or poor sensor performance.
What is the Risk Level of the P2421 Error Code?
The P2421 error code is considered to have a medium risk level. While it does not typically lead to immediate engine failure, it can result in reduced engine efficiency, increased emissions, and potential damage to the DPF if not addressed.
Which Vehicles are Affected by the P2421 Error Code?
The P2421 error code is generally found in diesel-powered vehicles like Ford, Mitsubishi, Volkswagen, Honda, Chevrolet, BMW and Toyota.