Powertrain, generic (extended)

P2D30 Cold Start Turbocharger/Supercharger A Overboost

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2D30 is the opposite of P2D2F: during the cold start strategy, boost from turbocharger or supercharger A rose above the permitted value. Outside that phase P0234 covers it. CARB lists electronic wastegate position as a cold start feature that has to follow its command, so a gate that stays shut when the strategy wants it open is the classic trigger. No manufacturer documents P2D30 publicly. For the related wastegate check GM's 2019 table for the 2.7 l L3B fails P2C9B when position error exceeds 20 % for more than 1 s under cold start conditions, Type A. GM bulletin 22-NA-002 (Equinox and Terrain 1.5 l) shows how cold causes boost faults: frozen oil and water in the wastegate regulator solenoid and ice inside the intercooler set P0234 or P0299. The module usually cuts power to protect the engine.

Likely causes

Wastegate flap or linkage stuck closed or stiff in the cold
Wastegate regulator solenoid blocked by frozen moisture or oil deposits
Electric wastegate actuator or its position feedback faulty
Boost pressure sensor reading too high

Symptoms

  • Sudden power reduction shortly after starting in the cold
  • Check engine light, sometimes with P0234 or a wastegate code
  • Unusually strong surge of power while the engine is cold

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time0.5–5 h

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

Parts involved

turbocharger awastegate a

Related codes

P2D2FP0234P2C9BP2B81P0299

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.