P2820 on Subaru: How to Diagnose & Fix
Pressure Control Solenoid "J" Performance or Stuck Off
1 Subaru model · 1 documented issue · 1 critical
P2820 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 This superseded the earlier WUV-07 recall and is the basis for the April 2024 class-action settlement covering 2019-2020 Ascents.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
P2820 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 P2820 mean on a Subaru?
P2820 stands for "Pressure Control Solenoid "J" Performance or Stuck Off." This code means the transmission control module determined that pressure control solenoid "J" is not responding as commanded or is stuck in the off position. These solenoids regulate the hydraulic pressure that applies the transmission's clutches and bands during shifts. When this solenoid is stuck or underperforming, the result is typically harsh or incorrect shifting, slipping, or limp mode. It can stem from a mechanical sticking of the solenoid/valve as well as fluid or electrical issues. On Subaru it is documented across 1 model: Ascent.
What are the most common causes of P2820?
The most common causes of P2820 are: Stuck or faulty pressure control solenoid "J", Low or contaminated transmission fluid, Debris in the valve body sticking the solenoid, Internal valve body wear/fault, Wiring or connector problems to the solenoid, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P2820 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.
Looking for P2820 on a different make?
View P2820 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.