Powertrain, generic · Fuel and air metering, auxiliary emission controls

P00BC Mass or Volume Air Flow A Circuit Range/Performance - Air Flow Too Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The control module compares the air mass measured by the air flow meter with the air mass it expects from a model, for example from manifold pressure, boost pressure and throttle position. These codes report the deviation with its direction: "too low" means the meter measures less air than expected, "too high" more. Regulations allow manufacturers to use one code for both directions or separate codes, as here. P00BC concerns air flow meter A. Typical causes are air entering behind the meter, a charge-air leak, a dirty meter or a restricted intake. No manufacturer description naming this exact code was found; the explanation follows its documented counterpart.

Likely causes

Air leak behind the meter or charge-air leak
Air flow meter dirty
Air filter or intake restricted
Wiring or connector faulty

Symptoms

  • Check engine light on
  • Loss of power
  • Lean mixture codes possible

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–350
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

mass air flow sensor aintake ductsmanifold absolute pressure sensor

Related codes

P00BDP00BEP00BFP0101P006A

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.