What does contribution/balance mean?

The ECM monitors how much each cylinder contributes to engine speed. If one falls behind, it sets this code.

Is this always an injector problem?

No — it could be spark plug, coil, compression, or injector. You need to diagnose which system is failing on that cylinder.

High Severity

Engine System

Cylinder 1 is not contributing its fair share of power. The ECM detected a significant power imbalance.

Common Fix

Repair cylinder 1 issue (injector, spark, or compression)

Estimated Cost (DIY)

$40 - $500

Faulty fuel injectorlikely

Low compression in cylinder 1possible

Ignition issue on cylinder 1possible

Need to read or clear this code?

Ready to fix it yourself?

Select your exact vehicle for a personalized guide

What does contribution/balance mean?: The ECM monitors how much each cylinder contributes to engine speed. If one falls behind, it sets this code.
Is this always an injector problem?: No — it could be spark plug, coil, compression, or injector. You need to diagnose which system is failing on that cylinder.

Need a diagnosis for your specific vehicle?

100% Free — No signup required