P0046 - Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance

The PCM detected a turbo or supercharger control fault, often tied to the bypass or boost-control circuit, a sticking actuator, or a pressure-control problem.

Code first. Confirm symptoms and checks before pricing parts.

Code Overview

The PCM detected a turbo or supercharger control fault, often tied to the bypass or boost-control circuit, a sticking actuator, or a pressure-control problem.

Common Causes

• Sticking boost-control or bypass actuator
• Vacuum or pressure leak
• Wiring or solenoid fault
• Turbocharger mechanical issue

Diagnostic Steps

1. Inspect boost-control hoses, connectors, and actuator linkage
2. Check for stuck bypass or wastegate movement
3. Compare commanded and actual boost-control data
4. Inspect for charge-pipe leaks before blaming the turbocharger

Likely Repairs & Cost Guides

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Related OBD Codes

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Next Steps

Move from code to checks, then estimate.