P0235 — Turbocharger Boost Sensor A Circuit
What it means: Turbocharger Boost Sensor A Circuit.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Inspect MAP/boost sensor connector
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Billings, MT
Closest first. Tell them P0235 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Billings, MT · (406) 245-8985
- 0.0 mi away — based in Billings, MT · (406) 252-8413
- 0.0 mi away — based in Billings, MT · (406) 780-3711
Seen on: Heavy Truck
What P0235 means
Turbocharger Boost Sensor A Circuit. Common causes: Boost pressure sensor failure.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Boost pressure sensor failure
- Wiring fault
- air leak before sensor
First moves (roadside)
- Inspect MAP/boost sensor connector
- measure 5V supply and signal
FAQ
Turbocharger Boost Sensor A Circuit. Common causes: Boost pressure sensor failure.
Caution — Limp to the next safe stop.
The most common cause is: Boost pressure sensor failure. Other possibilities include Wiring fault; air leak before sensor.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside P0235, or share the same subsystem.
- Engine Protection — Power Derate Active (SPN 1569 FMI 31)
- Intake Manifold (Charge Air) Temp — High (SPN 105 FMI 0)
- Turbo Boost Pressure — High / Overboost (SPN 1127 FMI 16)
- Boost pressure high (SPN 102 FMI 0)
- Boost sensor — voltage low (SPN 102 FMI 4)
- Intake manifold temp — voltage high (SPN 105 FMI 3)
- Intake manifold temp — voltage low (SPN 105 FMI 4)
- Injection control pressure low (HEUI — older engines) (SPN 164 FMI 1)
Same symptom: Low boost / low power
Other air-path codes that arrive as a truck that will not pull the hill it pulled yesterday.
- Turbo boost pressure high (SPN 1127 FMI 0) · Engine
- Turbo compressor inlet temp high voltage (SPN 1172 FMI 3) · Engine
- Turbo compressor inlet pressure — high voltage (SPN 1176 FMI 3) · Engine
- VGT actuator position — not responding (SPN 2795 FMI 7) · Engine
- VGT position — not responding (similar to 2795) (SPN 5571 FMI 7) · Engine
- Turbo turbine inlet temp — high voltage (SPN 5856 FMI 3) · Engine
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.