Error code
OBD2 P0048
OBD2P0048
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 High.
Severity
moderateCan drive but performance issues may occur.
Summary
P0048 indicates that there is an issue with the turbocharger or supercharger boost control solenoid circuit, specifically detecting high voltage signals or abnormal 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
- Visual inspection of all related wiring, connectors, components, and vacuum hoses.
- Check battery cable and post condition; rectify loose or corroded connections.
- Obtain manufacturer’s service manual with diagnostic flow chart for this code.
- Test boost control solenoid resistance levels using 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 shows P0048?
Start by checking all wiring and connectors for damage. Test the boost control solenoid resistance and circuit voltage/continuity as per manufacturer's specifications.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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