Error code

OBD2 P0284

OBD2P0284
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Cylinder 8 Contribution/Balance.

Severity

moderateCan drive but may experience reduced performance and fuel efficiency.

Summary

P0284 indicates that cylinder #8 is not contributing properly to the engine's balance and efficiency. This issue can be detected by the Engine Control Module (ECM) through monitoring the crankshaft position sensor.

Symptoms

  • Reduced engine performance
  • Decreased fuel economy
  • Rough idle

Common Causes

  • Dirty or clogged fuel injectors
  • Improper replacement of fuel injectors without proper learning procedure
  • Mechanical issues such as worn rings, burnt valves, or leaking head gasket

Diagnosis

  1. Check for corrosion or water damage in the fuel injector and driver connectors
  2. Compare waveforms of cylinder #8's fuel injector with its neighbors using a digital oscilloscope
  3. Perform cylinder compression and leakdown tests to identify mechanical issues

Fixes

  • Clean or replace dirty/clogged fuel injectors

FAQ

What does P0284 mean?

P0284 indicates that cylinder #8 is not contributing properly to the engine's balance and efficiency.

How do I diagnose P0284?

Diagnose by checking fuel injectors, comparing waveforms with a digital oscilloscope, and performing compression tests.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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