P0046 Turbocharger/Supercharger Boost Control “A” Circuit Range/Performance

Definition: This code indicates that the Engine Control Module (ECM) has detected a problem with the turbocharger or supercharger boost control circuit. The issue is related to the range or performance of the circuit.

p0046 – Turbocharger/Supercharger Boost Control A Circuit Range/Performance

Typical severity: Moderate

Common Causes

P0046 – Turbocharger/Supercharger Boost Control A Circuit Range/Performance

Common causes:

• Faulty wastegate control solenoid
• Wastegate stuck open or closed
• Boost pressure sensor malfunction
• Vacuum leaks in the intake system
• Wiring issues such as shorts or opens in the circuit

 

Common Misdiagnosis

OBD2 Code: P0046

Description: Turbocharger/Supercharger Boost Control “A” Circuit Range/Performance

Common Misdiagnosis: Replacing the turbocharger or supercharger without checking for issues in the boost control solenoid, vacuum lines, or electrical connections.

 

Common Diagnostic Steps

OBD2 Code: P0046

Description: Turbocharger/Supercharger Boost Control “A” Circuit Range/Performance

• Verify the code with an OBD-II scanner and clear it to see if it returns.
• Inspect the turbocharger/supercharger boost control solenoid for damage or disconnection.
• Check all related wiring and connectors for signs of wear, corrosion, or damage.
• Test the voltage and ground signals at the boost control solenoid using a multimeter.
• Examine vacuum lines connected to the turbocharger/supercharger for leaks or blockages.
• Ensure that there are no obstructions in the intake or exhaust systems affecting boost pressure.
• If applicable, test the operation of any wastegate actuators or bypass valves associated with the system.
• Use a scan tool to monitor live data from sensors related to boost pressure and compare them against specifications.
• If necessary, replace faulty components such as sensors, solenoids, or actuators based on diagnostic findings.