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P0202 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 2

Check Engine Light

P0202 code definition

The P0202 code is a general OBD-II diagnostic trouble code (DTC) associated with the injector circuit.

  • Note: This code may be seen with P0200, P0201, or P0203-P0212. P0202 may also be seen with misfire codes and lean or rich condition codes.

What the P0202 code means

P0202 indicates that the ECM has detected a malfunction for the cylinder 2 injector circuit. The code is set once the ECM detects out-of-range voltage or resistance.

The malfunction causes the ECM to set a Check Engine Light and a failsafe mode. This failsafe mode is to protect the vehicle from further damage. Failsafe is enabled until normal injector operation is found or the fault is repaired.

What causes the P0202 code?

  • Failing or failed cylinder 2 fuel injector
  • Faulty ECM
  • Open or short in the wiring harness for the cylinder 2 injector circuit
  • Poor or broken electrical connection

What are the symptoms of the P0202 code?

  • Check Engine Light present
  • Rich or lean engine conditions causing poor gas mileage
  • Lack of power and poor acceleration
  • Vehicle may stutter or die while running and not restart

How does a mechanic diagnose the P0202 code?

First, a technician will use a scanner to find out what codes are stored in the ECM. These codes will have freeze frame data associated with each code which tells the technician what the vehicle conditions were when the malfunction was detected. All codes will then be cleared and a road test of the vehicle will be done, preferably under conditions similar to when the fault was first detected.

Next, a visual inspection will be performed for the injector circuit looking for any damaged wiring, loose or broken connectors, or components with damage. After the visual inspection, the scan tool will be used to check for injector operation and voltage and resistance.

A digital multimeter will then be used to check for voltage present at the cylinder 2 fuel injector. The technician will then use a noid light installed between the injector and the wiring to test the pulse of the fuel injector.

Lastly, the ECM will be tested if the vehicle passes all other checks.

Common mistakes when diagnosing the P0202 code

Mistakes when repairing and diagnosing the vehicle can be costly and can waste valuable time and money. Care should be taken when performing diagnosis to follow all steps in their entirety and in the correct order. The injector circuit must be fully tested before the fuel injector is replaced to make sure there are no other faults.

How serious is the P0202 code?

P0202 can present serious issues if left unresolved, such as the vehicle dying and not being able to restart. This can be a result of the ECM enabling failsafe mode to protect the vehicle or a failed component, such as a fuel injector. In either circumstance, it is advised to have professional help as soon as possible to get the vehicle back to its normal operation.

What repairs can fix the P0202 code?

Additional comments for consideration regarding the P0202 code

A professional will use specialty tools in the diagnostic process of P0202. These are used to ensure accurate diagnosis and to avoid guesswork. A noid light set is used to monitor the pulse width and duration of the fuel injectors a factor that is important in fuel delivery.

Technicians will also need an advanced scan tool that allows live data to be read and graphed will be required as well. Scanners such as these show voltage, ohms, and changes over time that aid in diagnosis.

As vehicles age in years and milage, dirt and contamination can build up in the fuel system causing the fuel system to not operate as designed. Cleaners such as Seafoam can be used to refresh the system and can aide in the repair for P0202.

Need help with a P0202 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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