P0846 on 2018-2020 CUPRA Leon (Cupra, Cupra R, Cupra ST) — Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance
1 vehicles · 1 makes · $200-$3,500 repair
Most Reported On
P0846 is an OBD-II diagnostic trouble code meaning “Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance.” This code means the transmission control module sees a signal from transmission fluid pressure sensor/switch B that is present but outside the expected (range/performance) values for current operating conditions. This sensor reports hydraulic pressure used to apply clutches and control shifts, so an implausible reading affects shift control. Symptoms can include harsh or delayed shifts, slipping, or the transmission entering failsafe mode. The fault is usually with the sensor, fluid pressure itself, or wiring rather than a total electrical failure. This code is most commonly reported on 2018-2020 CUPRA Leon (Cupra, Cupra R, Cupra ST), with repair costs ranging from $200 to $3,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P0846.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does P0846 mean?
P0846 stands for "Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance." This code means the transmission control module sees a signal from transmission fluid pressure sensor/switch B that is present but outside the expected (range/performance) values for current operating conditions. This sensor reports hydraulic pressure used to apply clutches and control shifts, so an implausible reading affects shift control. Symptoms can include harsh or delayed shifts, slipping, or the transmission entering failsafe mode. The fault is usually with the sensor, fluid pressure itself, or wiring rather than a total electrical failure.
What are the most common causes of P0846?
The most common causes of P0846 are: Faulty transmission fluid pressure sensor/switch B, Low or dirty transmission fluid, Internal hydraulic leak or low line pressure, Stuck or faulty pressure control solenoid, Wiring or connector problems, Valve body wear, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0846?
Repair costs for P0846 range from $200 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P0846?
Au7o has documented P0846 across 1 vehicle models from 1 manufacturers: CUPRA.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.