Powertrain, generic (extended)

P2432 AIR System Air Flow/Pressure Sensor Circuit Low (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2432 means the bank 1 secondary air pressure signal has fallen below its valid band – typically a broken signal lead, a ground short or a missing 5 V reference. GM's tables give the limit as under 5 % of the reference (400 failed samples out of 1,000 on the 2005 3.8L V6) and, from 2018, under 6 % for 800 of 1,000 samples; the check runs all the time and is rated Type B. Volkswagen flags the code below 0.40 V on 2014 Beetle and Golf CBFA engines and below 0.5 V on the 2.5L five-cylinder. Because a dead signal makes every flow and valve test meaningless, those tests are suspended while the code is stored. The high-side twin is P2433, bank 2 uses P2437. Drivability is not affected.

Likely causes

Signal wire open or shorted to ground
5 V reference missing, often shared with other sensors
Pressure sensor failed internally

Symptoms

  • Check engine lamp, also while driving warm
  • Secondary air tests not run
  • Other sensor codes if the shared 5 V line is affected

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–300
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

P2430P2431P2433P2437

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.