P020C Fault Code

P020C OBD-II Trouble Code Short Description

Cylinder 3 Injection Timing

What does trouble code P020C mean?

The P020C fault code on cars indicates a problem with the fuel injector circuit on cylinder #3. This fault code is typically seen in vehicles with electronic fuel injection systems. The injector circuit is responsible for delivering the right amount of fuel to the engine, and when it fails, it can cause a variety of issues such as engine misfires, decreased fuel efficiency, and poor engine performance.

The solution for this fault code usually involves troubleshooting the wiring and connections associated with the injector circuit to identify any potential faults. This may involve using diagnostic equipment to check for voltage drops, resistance, and continuity in the circuit. If the issue is found to be with a defective injector, it will need to be replaced.

It is important to address the P020C fault code promptly as it can cause further engine damage if left unresolved. In addition, it can also cause the vehicle to fail an emissions test, which can result in fines or other penalties.


What are the symptoms of the P020C code?

  • Illuminated check engine light on the dashboard
  • Loss of engine power or acceleration
  • Rough idling or stalling
  • Reduced fuel efficiency
  • Hesitation or misfiring during acceleration
  • Increased emissions from the exhaust system
  • Difficulty starting the engine or issues with the engine's overall performance
  • Inability to pass emissions tests or smog checks.


What causes the P020C code?

P020C is a fault code associated with fuel injector circuit "C". This code is usually detected by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects that the voltage signal from the fuel injector circuit "C" is too low or too high. This can lead to a number of problems such as decreased engine performance, reduced fuel efficiency, and higher emissions.

There are several potential causes for the P020C fault code, including:

  1. Faulty fuel injector - A damaged or clogged fuel injector can cause this code to appear. A physical inspection of the fuel injector and its wiring should be performed to identify any issues.

  2. Wiring issues - A damaged or corroded wiring connection in the fuel injector circuit can also be the cause of this code. A thorough inspection of all wiring connections should be performed.

  3. Failed fuel injector driver circuit - If the fuel injector driver circuit has failed, the ECM or PCM will be unable to control the fuel injector properly, leading to the P020C fault code.

  4. Malfunctioning ECM or PCM - In rare cases, a malfunctioning ECM or PCM can also be the cause of this code. Test the vehicle's computer with a diagnostic tool to determine if this is the case.

It is important to address the underlying cause of the P020C fault code as soon as possible to prevent further damage to the vehicle's engine or other components. It is recommended to have a professional mechanic perform a diagnostic test to identify the exact cause of the fault code and make any necessary repairs.

Possible Solutions

How to fix P020C?

The P020C fault code on cars typically indicates an issue with one or more fuel injectors. Here are a few steps you can take to fix the issue:

  1. Check the fuel injectors: Start by visually inspecting all the fuel injectors to see if any are damaged or broken. Ensure they are clean, free from any debris, and properly seated. You can use a multimeter to test the injector electrical resistance and ensure they are within the manufacturer's specifications.

  2. Test the wiring harness: Inspect the wiring harness that connects the injectors to the vehicle's computer. Look for any visible signs of damage or corrosion. You can use a multimeter to test the continuity of the wires and the voltage between the injector and the computer.

  3. Replace the injector or wiring harness: If you find any issues with the injector or wiring harness, replace them as necessary. Ensure you use genuine replacement parts and follow the manufacturer's recommended installation procedure.

  4. Clear the fault code: After you have replaced any faulty components, clear the fault code using a code reader or scanner. This will reset the vehicle's computer and turn off the check engine light.

If the P020C fault code persists after you have followed these steps, you may need to take your vehicle to a professional mechanic for further diagnosis and repair.


  • What is P020C?

    P020C is a diagnostic trouble code (DTC) that indicates a generic powertrain error related to the fuel injector circuit.

  • What causes P020C?

    P020C can be caused by various issues such as a faulty fuel injector, damaged wiring or connectors, or a faulty Engine Control Module (ECM).

  • How do I diagnose P020C?

    Diagnosing P020C usually involves inspecting the fuel injector circuit for damage or loose connections, checking the injector for resistance, and testing the ECM.

  • Can P020C affect vehicle performance?

    Yes, P020C can affect vehicle performance by causing misfiring, rough idling, and decreased power and fuel economy.

  • Can I still drive my car with P020C?

    It is not recommended to drive with a P020C code as it can cause further damage to the engine and may lead to costly repairs.

  • How much does it cost to fix P020C?

    The cost to fix P020C can vary depending on the cause of the issue and the location of the repair, but it can range from $100 to $1000 or more.

  • Can I fix P020C myself?

    If you have experience and knowledge in automotive repair and diagnostics, you may be able to fix P020C yourself. However, it is recommended to seek assistance from a certified mechanic.

  • How often does P020C occur?

    P020C can occur in any vehicle model, make, or year with a fuel injector circuit, but it is not a very common issue.