P0846 on Hyundai: How to Diagnose & Fix
Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance
1 Hyundai model · 1 documented issue
P0846 on Hyundai by model: symptoms, diagnosis and fix
Hyundai TSB 23-AT-010H (August 2023) covers 2020MY-and-later Venue (QX) equipped with the IVT, alongside Elantra, Accent and Kona IVT models. The IVT driven-pulley oil pressure sensor (part 48885-02300) can fail electrically or read out of range, turning on the check-engine light with P0845 (sensor output at or below 0.27 V or at or above 4.50 V), P0846 (sensor output 2.5-3.5 V with target-vs-actual driven-pulley pressure off by 4 bar or more) or P0867 (target vs actual secondary pulley pressure differing by more than 7 bar). The bulletin exists because dealers had been replacing whole transmissions for what is a sensor fault: when the vehicle has ONLY the DTC and no drivability complaint (no slipping, shift shock, poor acceleration or failure to engage), the sensor is replaced through the IVT oil pan with a new pan gasket and 7 quarts of fluid, then 'Oil Pressure Characteristics Input' and adaptive-value relearn are performed with GDS-M. If drivability symptoms are present the whole IVT is still replaced. Note P0867 also appears in the T8X campaign list for 2020-22 units, so an owner with P0867 should have both bulletins checked.
Common Symptoms
- Check engine light with the car driving normally
- Stored P0845, P0846 or P0867 in the transmission control unit
- Slipping, shift shock or poor acceleration (means the IVT is replaced, not just the sensor)
How to Fix
Have the dealer scan the TCU. If only P0845/P0846/P0867 are stored and the car drives normally, TSB 23-AT-010H authorises replacing the IVT oil pressure sensor (48885-02300), IVT pan gasket (48282-2H000), plug gaskets and fluid, followed by the GDS oil-pressure characteristics input and adaptive learning - subject to actual warranty eligibility. The US 10-year/100,000-mile powertrain warranty generally applies to the original owner; subsequent owners normally retain 5-year/60,000-mile new-vehicle coverage, subject to its terms. Ask the dealer to verify coverage for the diagnosed part. If slipping or shift shock accompanies the code, the transmission itself is replaced.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (2)
P0846 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0846 mean on a Hyundai?
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. On Hyundai it is documented across 1 model: Venue.
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 on a Hyundai?
Repair costs vary widely with the root cause and Hyundai model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.