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P0287 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.


P0287 is a DTC code, specifically relating to “9Cylinder Dual Injection System High.” This code is a part of OBD II, which monitors every component in your car’s engine or exhaust system all the time. The OBDII system shall detect high voltage or resistance issues in the fuel injection circuit in cylinder 9 when a P0287 code is triggered.


Simplificationally speaking, the code “Cylinder 9 Injector Circuit High” may indicate that a power problem exists in the fuel injection circuit of cylinder 9. The failure of the fuel injection system to work properly may be triggered by abnormal voltage or resistance, and could thus result in problems with gas delivery and engine performance.


Several factors can lead to the triggering of the P0287 code:

  • Faulty Fuel Injector: A malfunctioning fuel injector in cylinder 9 can cause electrical issues and lead to this code.
  • Wiring Problems: Damaged or corroded wiring in the injector circuit can result in high electrical resistance.
  • Injector Connector Issues: Problems with the connector that links the fuel injector to the engine control module (ECM) can cause electrical irregularities.
  • ECM Malfunction: In rare cases, a malfunction in the engine control module itself can lead to the P0287 code.


To diagnose and repair a P0287 error quickly, you must be aware of its symptoms. Typical signs include:

  • Check Engine Light: The most obvious sign is the illumination of the check engine light on your vehicle’s dashboard.
  • Engine Performance Issues: You may notice a reduction in engine power, rough idling, or poor acceleration.
  • Increased Fuel Consumption: Issues with the fuel injector circuit might result in ineffective fuel delivery, which increases fuel usage.


A skilled mechanic would normally carry out the following actions to troubleshoot a P0287 code:

  • OBD-II Scan: The problem code and any freeze frame information linked to it will be retrieved using a scan tool.
  • Visual Inspection: The fuel injector, its wiring, and its connector will all be visually inspected by the technician for corrosion or signs of damage.
  • Testing of the Injector: The Cylinder 9 fuel injector will be examined for mechanical and electrical functionality.
  • Wiring and Connector Check: The fuel injector circuit’s wiring and connector will be examined for continuity and correct connection.
  • ECM Evaluation: In extremely unusual circumstances, the engine control module’s functioning may be assessed if no other problems are discovered.

Common mistakes

  • It’s important to follow these guidelines while working with the P0287 error code:
  • Ignoring the Code: Ignoring a check engine light and the accompanying code may result in more serious and expensive problems down the road.
  • Changing Parts Without Diagnosis: Changing the fuel injector or other parts without first getting the problem identified can be expensive and may not resolve it.
  • Neglecting Routine Maintenance: P0287 and related codes can be avoided by performing routine maintenance, such as fuel system cleaning and injector maintenance.

How serious is this?

The severity of the P0287 code depends on several factors, including the extent to which this issue is concerned and how quickly it can be resolved. Failure to comply with this code may lead to decreased engine performance and fuel efficiency, which can cause more severe damage in the future. This issue should be dealt with as soon as possible so that there are no additional complications.

What repairs can fix the codeS?

repair manuals

Depending on the underlying problem, a P0287 code will require a certain remedy. Possible fixes include:

  • Fuel Injector Replacement: If the fuel injector for cylinder 9 is faulty, it may need to be replaced.
  • Wiring or Connector Repair: Damaged wiring or connectors should be repaired or replaced as necessary.
  • Injector Circuit Cleaning: In some cases, cleaning the injector circuit can resolve the issue.
  • Engine Control Module Replacement: On rare occasions, replacing the engine control module may be necessary.

Related codes

While P0287 is specific to cylinder 9, there are related codes that may appear in similar situations, such as P0280 (Cylinder 7 Injector Circuit High) or P0281 (Cylinder 8 Injector Circuit High). Understanding these related codes can provide additional insight into engine performance issues.


The P0287 DTC code shows the engine of your vehicle to be having an issue with the 9Cylinder Injector Circuit High. It is essential to take this code seriously, in the absence of any corrective action, it can reduce engine performance and fuel efficiency. To restore the optimum performance of your vehicle, you must be able to identify and solve the main reasons promptly, like an incorrect fuel injection system or electrical problems. Regular maintenance and prompt attention to check engine lights can help prevent such issues, ensuring your vehicle runs smoothly for years to come.

P0287 Code – What Does It Mean & How To Fix It