Error code

OBD2 P0045

OBD2P0045
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/Open.

Severity

moderateCan drive but performance issues may worsen over time.

Summary

P0045 indicates an open circuit in the turbocharger or supercharger boost control solenoid, which is part of the engine's forced air induction system.

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

  1. Inspect all related wiring, connectors, components, and vacuum hoses for damage.
  2. Check battery cable and post condition; rectify loose or corroded connections.
  3. Clear codes from the system to check if it returns to normal operating conditions.
  4. Use a digital volt/ohmmeter (DVOM) to test solenoid resistance levels.
  5. Perform circuit voltage and continuity tests on wiring.

Fixes

  • Replace faulty boost control solenoid or repair damaged wiring/connectors.

FAQ

What should I do if my car shows P0045?

Start by inspecting the wiring and connectors related to the turbocharger/supercharger boost control solenoid. If issues are found, repair or replace them as needed.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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