Error code
OBD2 P0046
OBD2P0046
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Turbo/Super Charger Boost Control Solenoid Circuit Range/Performance.
Severity
moderateCan drive but performance issues may worsen over time.
Summary
P0046 indicates an issue with the turbocharger or supercharger boost control solenoid circuit range/performance, affecting engine performance and potentially causing excessive boost pressure.
Symptoms
- Lack of engine performance
- Abnormal hissing noises from underhood area
- Increased engine and/or transmission temperatures
- Unusual amounts of black smoke from exhaust
- Fouled spark plugs
- Hotter engine temperatures causing cylinder detonation
- Reduced engine acceleration
Common Causes
- Faulty boost pressure sensor
- Defective turbocharger/supercharger boost control solenoid
- Shorted or open wiring in the boost control solenoid circuit
- Loose, corroded, burnt, or disconnected electrical wiring/connectors in the boost sensor 5-volt reference circuit
- Turbocharger failure
Diagnosis
- Visually inspect all related wiring, connectors, components, and vacuum hoses.
- Check battery cable and post condition; rectify loose or corroded connections.
- Clear codes from the system and check if symptoms persist.
- Use a manufacturer’s service manual to follow diagnostic flow chart for P0046.
- Test boost control solenoid resistance with a digital volt/ohmmeter (DVOM).
- Perform circuit voltage and continuity tests on system wiring.
Fixes
- Replace faulty components such as the boost pressure sensor or turbocharger/supercharger boost control solenoid.
FAQ
What should I do if my car has P0046?
Start by visually inspecting all related wiring and components. If issues are found, repair or replace them as needed. Clear the codes from your system and see if symptoms persist before proceeding with further diagnosis.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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