P0212 Fault Code

P0212 OBD-II Trouble Code Short Description

Cylinder 12 Injector Circuit Malfunction

What does trouble code P0212 mean?

The P0212 fault code on cars indicates a problem with the fuel injection pump control circuit. This code is usually seen on diesel engines and can be caused by a malfunction in the fuel injection pump controller, a bad fuel filter, or a clogged fuel line.

To diagnose and fix the issue, a professional mechanic will need to perform a thorough inspection of the fuel system and wiring. In some cases, the fuel injection pump controller may need to be replaced.

It's important to address the P0212 fault code promptly because it can lead to engine misfires, reduced power and fuel efficiency, and potentially expensive damage to the engine. Regular maintenance and inspection of the fuel system can help prevent this code from occurring in the first place.


What are the symptoms of the P0212 code?

The P0212 fault code indicates a malfunction in the fuel injector control circuit for cylinder number 12. Here are some symptoms that may be experienced with this fault code:

  1. Check engine light: P0212 will trigger the check engine light to come on and remain illuminated until the issue is resolved.

  2. Engine misfire: Since the injector circuit controls the fuel delivery to the cylinder, a malfunction here can cause misfiring of the engine.

  3. Rough idling: The engine may run roughly or irregularly at idle due to the misfiring of the cylinder.

  4. Poor acceleration: The engine may struggle with acceleration due to the lack of fuel delivery to the cylinder.

  5. Decreased fuel efficiency: A malfunction in the fuel injector control circuit can cause the engine to use more fuel than usual, decreasing fuel efficiency.

  6. Electrical issues: The fault code may indicate an issue with the electrical wiring or connector to the fuel injector, resulting in intermittent electrical problems.


What causes the P0212 code?

The P0212 fault code refers to a problem with the fuel injector circuit in cylinder number 12 of a vehicle. This code is typically seen in diesel engines.

Possible causes of the P0212 code include:

  1. Fuel injector failure - a faulty or clogged fuel injector may cause the circuit to malfunction
  2. Wiring issues - damaged or corroded wiring or connectors in the fuel injector circuit can cause a P0212 code to appear
  3. Control module failure - a malfunctioning engine control module (ECM) may result in a P0212 code
  4. Fuel system issues - a blocked fuel line, fuel pump failure, or low fuel pressure can trigger this code
  5. Mechanical issues - problems with the fuel system, such as timing or compression issues, can cause a P0212 code

If left unresolved, the P0212 code can lead to reduced vehicle performance, poor fuel economy, or engine damage. It is recommended to have the issue diagnosed and repaired by a qualified mechanic.

Possible Solutions

How to fix P0212?

The P0212 fault code indicates that there is a problem with the fuel injection system. This can be caused by a number of different factors, including a malfunctioning fuel injector, a clogged fuel filter, or a faulty fuel pressure regulator.

To fix this issue, follow these steps:

  1. Check the fuel injector for damage or wear. If it is damaged, replace it with a new one.

  2. Inspect the fuel filter to see if it is clogged or dirty. If it is, replace it.

  3. Test the fuel pressure regulator to see if it is functioning properly. If it is not, replace it.

  4. Check the fuel lines and hoses for any leaks or damage. If there are any issues, repair or replace them.

  5. Reset the fault code using a diagnostic tool to clear any existing codes and ensure that the issue is fully resolved.

By following these steps, you should be able to fix the P0212 fault code on your car and restore proper fuel injection system function.


  • What does code P0212 mean?

    Code P0212 indicates a malfunction in the Fuel Injection Pump (FIP) module.

  • What are the symptoms of P0212?

    Symptoms of P0212 include hard starting, reduced engine power, rough idling, and/or misfiring.

  • What are some possible causes of P0212?

    Possible causes of P0212 include a faulty FIP module, a damaged wiring or connector in the injection system, or an issue with the fuel pressure sensor.

  • How is P0212 diagnosed?

    Diagnosis of P0212 generally involves using a scan tool to retrieve the diagnostic trouble code and then performing further testing to identify the root cause of the issue.

  • Can I still drive my vehicle with code P0212?

    It is not recommended to drive your vehicle with code P0212 as it can cause further damage to the engine and other components.

  • How is P0212 repaired?

    The repair for P0212 will depend on the underlying cause but will generally involve replacing the malfunctioning component or repairing any damaged wiring or connectors.

  • How can I prevent P0212 from occurring?

    Regular maintenance of the fuel injection system and fuel filters can help prevent code P0212 from occurring.

  • Is code P0212 common?

    Code P0212 is not a common code but can occur in some diesel engine vehicles, particularly those with high mileage or with a lot of aftermarket modifications.