P0841 on Subaru: How to Diagnose & Fix
Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance
1 Subaru model · 1 documented issue · 1 critical
P0841 on Subaru by model: symptoms, diagnosis and fix
A TCU programming error allows the Lineartronic CVT to engage before the drive chain is fully secured, causing chain slippage that fragments the chain guide. Owners report shudder, hesitation, irregular noises and MIL illumination; in worst cases chain breakage causes loss of motive power. This superseded the earlier WUV-07 recall and is the basis for the April 2024 class-action settlement covering 2019-2020 Ascents.
Common Symptoms
- shudder on acceleration
- hesitation
- whining or rattling from CVT
- CEL/MIL illuminated
- loss of forward propulsion
- P0700 / P2820-type codes
How to Fix
Verify recall WRK-21 / 21V-955 is completed at a Subaru dealer (free TCU reprogram, chain-slip data inspection, visual chain-guide inspection, and replacement of the CVT with a cooler flush if slippage or guide damage is found). Where the CVT is not replaced, the recall extends CVT coverage for chain slip to 10yr/100k. Class-action settlement (final approval April 18, 2024) extends powertrain warranty to 8yr/100k for affected VINs and provides reimbursement vouchers ($400-$750) for prior repair attempts.
Sources for this issue (5)
- Subaru Product Campaign Bulletin WRK-21/22R - CVT Chain Guide Breakage (NHTSA copy)manufacturer
- NHTSA Recall 21V-955 Part 573 Safety Recall Reportrecall
- NHTSA Recall 21V-955 / WRK-21 CVT Chain Guide Breakagerecall
- RECALL: WRK21 / NHTSA 21V955000 - Ascent CVT Chain Guide Breakageforum
- Subaru Ascent CVT Lawsuit Settlement Informationarticle
P0841 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 P0841 mean on a Subaru?
P0841 stands for "Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance." This powertrain code means the transmission computer detected the 'A' transmission fluid pressure sensor or switch reading out of its expected range or not matching actual operating conditions. This sensor converts hydraulic line pressure into an electrical signal the computer uses to manage shift timing and quality. An out-of-range reading can cause incorrect shift behavior, harsh or slipping shifts, or limp mode. It should be addressed to prevent drivability problems and possible transmission damage. On Subaru it is documented across 1 model: Ascent.
What are the most common causes of P0841?
The most common causes of P0841 are: Low or contaminated transmission fluid, Faulty transmission fluid pressure sensor/switch, Wiring or connector problems in the sensor circuit, Clogged filter or restricted fluid passages, Worn valve body or internal pressure control fault, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0841 on a Subaru?
Repair costs vary widely with the root cause and Subaru 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.