The powertrain control module (PCM) detects that the boost pressure sensor B circuit is reading a voltage lower than expected, indicating insufficient boost pressure.
The sensor itself may be defective and output a low voltage signal, causing the PCM to register a circuit low condition.
Corroded, damaged, or loose wiring and connectors in the sensor B circuit can interrupt the signal and produce a low reading.
A poor ground or internal short in the sensor circuit can cause the voltage to drop below the normal range.
A failing turbocharger or wastegate can generate insufficient boost pressure, leading the sensor to report low values.
A rare failure of the PCM's input stage for the boost sensor can mimic a low‑circuit condition, but this is usually considered only after other causes are ruled out.
No. In the majority of cases the problem is a faulty sensor, wiring, or low boost pressure; PCM replacement is uncommon and should only be considered after other causes are eliminated.
Yes. A vacuum leak upstream of the turbocharger can reduce boost pressure, causing the sensor to read low and trigger P0241.
Sensor B refers to the secondary boost pressure sensor in systems that have multiple boost sensors; it functions the same way as the primary sensor but is monitored separately.
Driving with P0241 is generally safe for short periods, but prolonged operation may result in reduced performance, higher fuel consumption, and potential damage to the turbocharger.