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P0846 — Trans fluid pressure sensor B circuit
SerioustransmissionPower derate likely — plan to stop soon
Trans fluid pressure sensor B circuit. Common causes: Sensor|Wiring.
Don't risk it — get a diesel tech on the truck.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Sensor
- Wiring
First moves (roadside)
- Unplug to invert
FAQ
What does P0846 mean?
Trans fluid pressure sensor B circuit. Common causes: Sensor|Wiring.
How serious is P0846?
Serious — Power derate likely — plan to stop soon.
What's the most likely cause of P0846?
The most common cause is: Sensor. Other possibilities include Wiring.
Can I keep driving with P0846?
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
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.