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P0212 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The P0212 DTC code shall be specific to a failure in the Injector Control Unit for cylinder 12. The OBDD II system used for detecting abnormalities related to the performance of fuel injectors is also equipped with this code.


OBDII’s P0212 DTC code shall be activated if your vehicle detects a problem with the Injector Control Circuit for cylinder 12. The code shows the possibility of trouble with the circuits that control the fuel injection valve in cylinder 12, which plays a major role in supplying fuel to the engine for combustion.


Several factors can lead to the P0212 DTC code, including:

  • Faulty Injector Control Module (ICM): The ICM, responsible for controlling the fuel injector for cylinder 12, may be malfunctioning or failing.
  • Wiring or Connector Issues: Improper or nonexistent fuel injection might result from faulty or loose wiring or connections connecting to the injector control circuit.
  • Issues with the Injector Control Circuit: The fuel injector for cylinder 12 may not operate properly if the injector control circuit has issues, such as excessive resistance or short circuits.


You may encounter one or more of the following symptoms when the P0212 DTC code is activated:

  • Check Engine Light Illumination: The check engine light on your dashboard turning on is the most obvious indication that anything is wrong.
  • Engine Misfires: Irregular fuel injection due to a malfunctioning injector control circuit can lead to engine misfires, rough idling, or a decrease in engine performance.
  • Reduced Fuel economy: Poor fuel atomization brought on by an injector control circuit that isn’t working correctly can lead to decreased fuel economy.


An experienced mechanic or technician will Utilize an OBD-II scanner to acquire the P0212 DTC code and examine frozen frame data. Additional testing can include:

  • ICM testing: using various testing techniques to confirm the Injector Control Module’s functioning.
  • Wiring Inspection: Examining the injector control circuit for cylinder 12 for obvious damage or loose connections.
  • Injector Testing: Ensuring that the fuel injector for cylinder 12 itself is functioning correctly.

Common mistakes

During diagnosis, various typical errors might happen, including:

  • Ignoring Other Related Codes: Isolating the P0212 code and ignoring other related codes that could provide important information.
  • Ignoring Wiring Issues: Ignoring the potential for wiring issues, which are frequently the root of injector control circuit failures.
  • Immediate ICM Replacement: Quickly swapping out the injector control module without doing thorough testing, which might not address the root cause of the problem.

How serious is this?

The DTC code P0212 is not to be disregarded, as it may cause engine performance problems and reduced fuel efficiency. Damage to other engine components can also be caused when prolonged driving with a defective injector control circuit for cylinder 12.

What repairs can fix the code?

repair manuals

The best course of action for fixing the problem will rely on its underlying causes, which may include:

  • ICM Replacement: If the Injector Control Module for cylinder 12 is determined to be faulty, it will need to be replaced.
  • Wiring or Connector Repair: Addressing any damaged or loose connections in the injector control circuit.

Related codes

Codes related to P0212 might include:

  • P0200: Fuel Injector Circuit Malfunction
  • P0201: Injector Circuit/Open – Cylinder 1
  • P0202: Injector Circuit/Open-Cylinder 2


It is vital that a qualified mechanic thoroughly diagnose the root cause in order to correctly identify it if your check engine light has been illuminated and you have obtained an identification code for P0212. In order to preserve the optimum engine performance, fuel efficiency, and lifetime of your vehicle, it is necessary that you take quick action and carry out appropriate repairs. In order to ensure that your vehicle runs properly and reliably for a long period of time, you must regularly check engine lamps and immediately fix them.

P0212 Code – What Does It Mean & How To Fix It