Powertrain, generic (extended)

P2262 Turbocharger/Supercharger Boost Pressure A Not Detected - Mechanical

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2262 says boost pressure A does not appear at all although the charging system should be producing it, and the cause appears to be mechanical rather than a sensor fault. The control unit sees the pressure after the compressor stay near ambient or close to manifold pressure. VW's 2014 book for the supercharged Touareg 3.0 TSI uses the ratio of boost to manifold pressure and flags it below a band of 1 to 1.25. Volvo technical journal 31319 (2016 four-cylinder B4204T23) traced P2262 together with P02CD to a fresh-air hose that had slipped off the air filter housing at the MAF; a spring clamp prevents a repeat. Unlike P0299, which measures a shortfall against the target, P2262 stands for boost missing altogether; P2263 rates overall control performance and P226B the opposite extreme. Acceleration feels flat, and many engines limit torque.

Likely causes

Intake or charge-air hose disconnected or split, so the compressor cannot build pressure
Wastegate or bypass stuck open, corroded or with a broken linkage
Damaged turbocharger or supercharger (bearing wear, broken drive, wheel damage)
Boost pressure sensor or its hose blocked or detached

Symptoms

  • Clear loss of power, no turbo or supercharger pull
  • MIL on, often with a reduced-power mode
  • Hissing or whistling from the intake if a hose has come off

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€20–2,500
Time0.5–6 h

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

Parts involved

turbochargercharge air pipewastegate actuatorboost pressure sensor

Related codes

P0299P2263P226BP0234P02CD

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.