P132B on GMC
Turbocharger/Supercharger Boost Control 'A' Performance Problem (manufacturer-specific)
P132B on GMC vehicles indicates turbocharger/supercharger boost control 'a' performance problem (manufacturer-specific). Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. P132B is a manufacturer-specific powertrain code, defined by Ford and similar makers as a Turbocharger/Supercharger Boost Control 'A' Performance Problem. The PCM commands a boost level via the boost control system (wastegate, solenoid, or vane actuator) and detected that actual boost did not match the commanded value. This usually means the engine is producing too little or too much boost, leading to reduced power, hesitation, or limp mode, and it should be diagnosed to avoid further driveability or turbo problems. Typical repair costs on GMC range from $200 to $3,500, depending on the specific model and root cause.
Common Causes of P132B
- •Faulty turbo/supercharger boost control solenoid or actuator
- •Wastegate or vane mechanism stuck, binding, or sticking
- •Boost or pressure sensor fault
- •Vacuum/boost line leaks or disconnected hoses
- •Intake or charge-air (intercooler) leaks
- •Wiring, connector, or electrical fault in the control circuit
- •Carbon buildup or mechanical turbocharger wear
P132B on GMC by Model
GMC Sierra 3500HD(1 issue)
- Turbocharger VGT Vane Sticking and Boost Control Failure (Duramax LML/L5P)2011-2022
The variable geometry turbocharger (Garrett GT3788VA on LML, and similar VGT on L5P) used on 6.6L Duramax engines develops carbon buildup on the variable vanes, causing them to stick and resulting in loss of boost control. Owners report surging, lack of power under load, black smoke, and check engine lights. This is a widely documented issue in Duramax owner communities and referenced in multiple TSBs including 16-NA-026.
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View P132B across all makes →Frequently Asked Questions
What does P132B mean on GMC?▼
P132B stands for "Turbocharger/Supercharger Boost Control 'A' Performance Problem (manufacturer-specific)." P132B is a manufacturer-specific powertrain code, defined by Ford and similar makers as a Turbocharger/Supercharger Boost Control 'A' Performance Problem. The PCM commands a boost level via the boost control system (wastegate, solenoid, or vane actuator) and detected that actual boost did not match the commanded value. This usually means the engine is producing too little or too much boost, leading to reduced power, hesitation, or limp mode, and it should be diagnosed to avoid further driveability or turbo problems. On GMC specifically, this code is documented across 1 model.
What causes P132B on GMC vehicles?▼
Common causes on GMC: Faulty turbo/supercharger boost control solenoid or actuator, Wastegate or vane mechanism stuck, binding, or sticking, Boost or pressure sensor fault, Vacuum/boost line leaks or disconnected hoses, Intake or charge-air (intercooler) leaks. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P132B on a GMC?▼
Repair costs on GMC range from $200 to $3,500, depending on the specific model and root cause.
Which GMC models have P132B documented?▼
Au7o has documented P132B on 1 GMC model: Sierra 3500HD.