Powertrain, generic (extended)

P2430 AIR System Air Flow/Pressure Sensor Circuit (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

On engines with an electric secondary air (AIR) pump, a pressure sensor in the duct between pump and shut-off valve tells the engine computer whether air is really moving to bank 1. P2430 is the basic signal fault of that sensor. GM applies it in a special way: on the 2005–2006 3.8L V6 and the 2006 Corvette and CTS-V V8s it stands for a reading that stays frozen while the pump is commanded on (average error below 0.5 and variance below 1.0 for more than 5 s, once per trip, Type B with MIL after two trips); the 2018 tables keep this logic. Low and high voltage have their own codes, P2432 and P2433; P2435 is the bank 2 twin. The car drives normally, but the secondary air check cannot finish.

Likely causes

Pressure sensor no longer reacts, signal frozen at one value
Sensor port or duct blocked by water, ice or debris from the pump
Corroded connector or damaged harness at the sensor

Symptoms

  • Check engine lamp after two cold starts
  • Secondary air readiness not set, emissions test refused
  • No noticeable change in driving behaviour

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–350
Time0.5–2 h

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

Parts involved

air system flow sensor b1sai wiring

Related codes

P2431P2432P2433P2434P2435P0411

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.