P0847 on Subaru
Transmission Fluid Pressure Sensor/Switch 'B' Circuit Low
P0847 on Subaru vehicles indicates transmission fluid pressure sensor/switch 'b' circuit low. Au7o has documented this code across 1 Subaru model — most commonly on Outback. The transmission fluid pressure sensor/switch 'B' circuit voltage is below the expected range (too low / shorted to ground).
Common Causes of P0847
- •Sensor signal shorted to ground
- •Faulty pressure sensor/switch B
- •Corroded/damaged connector
- •Internal TCM fault
P0847 on Subaru by Model
Subaru Outback(1 issue)
- CVT Valve Body / Internal Failure (10yr-100k Warranty Extension)2010-2015
Early Lineartronic CVT Outbacks (2010-2015) have documented internal CVT failures — most commonly valve-body faults, but also chain/pulley and pressure-control problems — that can cause harsh or delayed engagement, RPM flare, jerking, limp mode, or complete loss of drive. Subaru acknowledged the problem with a CVT Warranty Extension to 10 years / 100,000 miles covering the CVT and everything associated with it (valve bodies, internal parts, harnesses, and leaks) on 2010-2015 Legacy/Outback (and related models). A revised/upgraded valve body is installed at repair. This is separate from the low-speed torque-converter shudder complaint; here the transmission can set fault codes and go into failsafe. Out of warranty, a full CVT replacement is a multi-thousand-dollar repair.
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View P0847 across all makes →Frequently Asked Questions
What does P0847 mean on Subaru?▼
P0847 stands for "Transmission Fluid Pressure Sensor/Switch 'B' Circuit Low." The transmission fluid pressure sensor/switch 'B' circuit voltage is below the expected range (too low / shorted to ground). On Subaru specifically, this code is documented across 1 model.
What causes P0847 on Subaru vehicles?▼
Common causes on Subaru: Sensor signal shorted to ground, Faulty pressure sensor/switch B, Corroded/damaged connector, Internal TCM fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0847 on a Subaru?▼
Repair costs vary widely depending on the root cause and specific Subaru model.
Which Subaru models have P0847 documented?▼
Au7o has documented P0847 on 1 Subaru model: Outback.