Error code

OBD2 P0275

OBD2P0275
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Cylinder 5 Contribution/Balance.

Severity

moderateCan drive but performance may be affected. Address the issue soon to prevent further damage.

Summary

P0275 indicates that cylinder #5 is not contributing properly to engine balance and efficiency. This issue can be detected by the Engine Control Module (ECM) through monitoring crankshaft position.

Symptoms

  • Reduced engine performance
  • Poor fuel economy
  • Rough idle

Common Causes

  • Dirty or clogged fuel injectors
  • Improper replacement of fuel injectors
  • Mechanical issues such as worn rings, burnt valves, or leaking head gasket

Diagnosis

  1. Check fuel injector and driver connectors for corrosion or water entry
  2. Use a digital oscilloscope to compare signals between cylinder #5's fuel injector and its neighbors
  3. Perform cylinder compression and leakdown tests

Fixes

  • Clean or replace dirty/clogged fuel injectors

FAQ

What should I do if cleaning the fuel injectors doesn't fix P0275?

If cleaning does not resolve the issue, consider replacing the faulty fuel injector or addressing mechanical issues like worn rings or a leaking head gasket.

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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