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P0248 is a diagnostic trouble code (DTC) for "Turbocharger Wastegate Solenoid B Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
This DTC refers to Turbocharger Wastegate Solenoid B Range/Performance.
In a turbocharged vehicle, the wastegate diverts exhaust by opening and closing to a certain degree and at certain times. This helps regulate maximum boost pressure, and offers a safeguard to protect the engine as well as the turbocharger itself.
P0248 indicates that the wastegate solenoid circuit has sent a signal to the PCM (powertrain control module) which is outside of the expected voltage, according to the manufacturer’s specifications. This signal tells the PCM that the solenoid is not controlling wastegate activity in the intended manner.
Possible causes of this fault include:
Aside from a stored code and lit malfunction indicator lamp (MIL), there may be rattling or whining in the turbocharger or its pipes, abnormal exhaust smoke, hissing from the wastegate or hoses, poor engine performance, and/or spark plug fouling. In addition, the engine or transmission may get too hot. Other DTCs may present, such as engine misfire, knock sensor, or other turbocharger codes. If the vehicle is equipped with a boost pressure gauge, it will show excessively high boost pressure levels.
The following may be required to find the source of this fault:
The actuator rod and other involved components are easy to overlook when diagnosing this code. Simply replacing the wastegate solenoid without also making sure that the circuitry is sound and that the wastegate door isn’t stuck may result in repeated solenoid circuit failure.
Another mistake is failing to repair any concurrent boost pressure sensor fault codes. These should be rectified before moving on to fix the wastegate solenoid circuit.
This malfunction most likely will not cause serious damage to other vehicle components, but it could cause problems which affect how well the vehicle runs. If the wastegate solenoid problem is accompanied by a stuck wastegate door, a constant boost condition may result, compromising drivability.
A wastegate solenoid B malfunction may be solved by:
Due to the customized nature of a turbocharged system, there is no predefined layout by which the wastegate solenoids are arranged. “B” simply refers to one of the solenoids in a group which work in sequence – there is no set position where this particular solenoid resides. This means that it’s important to have the relevant documents, including a wiring diagram, for your particular system.
If you’re attempting this repair yourself, don’t forget to retest the system with a scanner once you’ve completed the job. In some cases, a malfunction has multiple causes and fixing just one will result in the DTC returning, in which case you would have to start the diagnostic and repair process all over again.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.