P0284 OBD-II Trouble Code: Cylinder 8 Contribution/Balance Fault

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Cost of diagnosing the P0284 code

P0284 is a diagnostic trouble code (DTC) for "Cylinder 8 Contribution/Balance Fault". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$20.00
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P0284 code definition

The P0284 code being stored indicates that your number eight cylinder is suffering from a problem related to fuel and, thus, can’t function properly.

What the P0284 code means

Your vehicle’s PCM keeps track of the power output generated by each cylinder. It does this by comparing the increase in speed – or acceleration – of the crankshaft of each cylinder during the power stroke.

When it senses that one or more of them is generating less power than the rest, the PCM stores a fault code P0284.

What causes the P0284 code?

Although there are a handful of possible causes that could be behind the P0284 code, they all have to do with the fuel injector. They are:

  • A plugged fuel injector in cylinder eight
  • A faulty fuel injector in cylinder eight
  • A dirty fuel injector in cylinder eight
  • A poor electrical connection in cylinder eight’s fuel injector circuit
  • The fuel injector harness of cylinder eight is shorted or open

What are the symptoms of the P0284 code?

When a P0284 code is stored, you should expect to notice at least one of the following symptoms associated with it:

How does a mechanic diagnose the P0284 code?

A mechanic would begin by inspecting the electrical connector on the fuel injector that belongs to cylinder eight. They’ll check the harness-side to see if any of the pins have been pushed out or if there is any corrosion. The injector will also have to be examined for bent pins. After that, they’ll also take a look at the wire that connects the fuel pump relay to the injector. With each new attempt, the mechanic will check to see if the code has cleared or if more work is needed to properly diagnose the cause.

Common mistakes when diagnosing the P0284 code

A fuel injector that is clogged – or even partially clogged – may also be responsible for this code. That’s why mechanics should perform an injector flush prior to continuing with replacing it as it may still be good after a cleaning.

How serious is the P0284 code?

Code P0284 is more of a nuisance than anything. That is, the problems associated with P0284 don’t necessarily mean your vehicle is unsafe to drive. You won’t lose control or be unable to brake because of them. However, your vehicle may also be a real challenge to drive and might begin making some irritating sounds. If it misfires, you could have some expensive repairs to face too. That’s why it’s still a good idea to play it safe and taking your vehicle to a qualified mechanic right away.

What repairs can fix the P0284 code?

Depending on what’s wrong that caused the code to be stored, any of the following steps could be necessary to clear it from the system.

Additional comments for consideration regarding the P0284 code

The P0284 code is a good reminder that regular maintenance is important for the functioning your vehicle. As you can tell from the above, a couple of the potential causes behind this code getting stored have to do with the fuel injector basically becoming too dirty to work properly.

Need help with a P0284 code?

If your vehicle is lacking because of P0284 problems or any other reason, let YourMechanic help get it back to 100%. We’ll send a certified mobile mechanic to your place of work or home where they’ll diagnose and repair it on the spot. Just call 1-800-701-6230 to speak with one of our service advisors or fill out a form to schedule an appointment. We’ll provide you with a free quote and get those repairs done ASAP.

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