TSB: REVISION NOTICE July 01, 2019 Rev2: ? Applicability has been updated to 2019 ? 2020 model year Toyota vehicles. ? The Techstream Preparation and Process Overview sections have been updated. October 30, 2017 Rev1: ? Applicability has been updated to include 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. SUPERSESSION NOTICE The information contained in this bulletin supersedes SB No. T-SB-0012-13. Service Bulletin No. T-SB-0012-13 is obsolete and any printed versions should be discarded. Be sure to review the entire content of this bulletin before proceeding. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated
full bulletin at NHTSA ↗2013 Toyota Sienna powertrain problems
moderate Owners of the 2013 Toyota Sienna have filed 14 NHTSA complaints about the powertrain at roughly $2,500 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See powertrain across all vehicles →
Complaints
14
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2009 Sienna | 6 |
| 2010 Sienna | 17 |
| 2011 Sienna | 28 |
| 2012 Sienna | 16 |
| 2013 Sienna (this page) | 14 |
| 2014 Sienna | 6 |
| 2015 Sienna | 10 |
| 2016 Sienna | 3 |
| 2017 Sienna | 34 |
When does it fail?
Of the 14 powertrain complaints filed for the 2013 Toyota Sienna, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA powertrain complaint has been filed on this vehicle in over 6 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
TSB: This bulletin includes basic procedures for inspecting and adjusting World Standard (WS) Automatic Transmission Fluid (ATF) level at normal vehicle operating temperature. Note: The following adjustment procedures are for U660E/F and U760E/F transmissions.
full bulletin at NHTSA ↗TSB: World Standard (WS) Automatic Transmission Fluid (ATF) was introduced to reduce maintenance costs and increase the mileage between scheduled maintenance checks. Here are some important tips when working with ATF-WS in Toyota vehicles requiring it's use.
full bulletin at NHTSA ↗TSB: The purpose of this bulletin is to provide precautions to follow when installing an automatic transmission/transaxle assembly to avoid MIL "ON" shifting issues and/or transmission damage. Use the information in this bulletin when installing an automatic transmission/transaxle assembly.
full bulletin at NHTSA ↗This bulletin includes basic procedures for inspecting and adjusting World Standard (WS) Automatic Transmission Fluid (ATF) level at normal vehicle operating temperature.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The dominant failure across these 14 complaints is rear differential viscous coupler bearing failure. Owners describe a grinding, whirring, or humming noise originating from the rear that increases with speed or acceleration. The noise can make conversation difficult and is loud enough to prompt immediate shop visits. Failures occur anywhere from 40,000 to 115,000 miles, with several cases happening shortly after original purchase or within the warranty window. The shop diagnosis is consistent: the viscous coupler bearings are bad and the entire assembly must be replaced as a unit—bearings alone cannot be serviced. Replacement cost ranges from $1,900 to $4,300 depending on shop and labor.
A recurring frustration in the narratives is that Toyota issued a recall for the identical part on RAV4 models years ago, yet has not extended the same recall to Siennas. Multiple owners call this a known manufacturing defect, noting forums "wallpapered with complaints." One owner purchased a used rear differential with 69,000 miles and experienced the same failure again at 100,000 miles, suggesting the defect is structural, not just mileage-related. One dealership had the part in stock, which owners interpret as evidence the failure is routine. Warranty denials occurred in at least one case where the manufacturer demanded third-party inspection before reimbursement.
One complaint mentions a slow front timing cover oil leak on the 2GR-FE engine below 100,000 miles.
Same Toyota Sienna powertrain reports on nearby years: 2010 · 2011 · 2012 · 2015
Failure modes owners describe
Rear differential viscous coupler bearing failure
The viscous coupler/bearing assembly in the rear differential fails prematurely, causing grinding, whirring, and growling noises that increase with vehicle speed or acceleration. Owners report the bearings cannot be serviced separately and the entire coupler unit must be replaced. Multiple owners note Toyota issued a recall for the identical part on RAV4 models but not on Sienna. The defect appears recurring even after replacement on used parts.
When: 40,000 to 115,000 miles; some failures occur shortly after purchase or within months of installation
Symptoms owners cite: Loud humming, grinding, or whirring noise from rear differential; Noise increases proportionally with vehicle speed; Noise present in drive but not reverse; Makes conversation in third row difficult; Propane or musty smell reported in cabin (one case)
Repairs/costs cited: Replacement of entire viscous coupler assembly; parts and labor range $1,900–$4,300. One owner purchased used rear differential assembly with 69,000 miles, which began making noise again at 100,000 miles. Dealerships frequently stock the part, suggesting high frequency of the failure.
Recalls/TSBs owners mention: RAV4 models were recalled for the same viscous coupler bearing defect; no recall issued for Sienna despite identical part and acknowledged failure pattern. Toyota warranty company denied coverage in at least one case, requiring third-party inspection verification before reimbursement.
Front timing cover oil leak
A slow oil leak develops from the front timing cover on the 2GR-FE engine. Owner expresses concern about progressive worsening and risk of engine failure or stranding.
When: Less than 100,000 miles
Symptoms owners cite: Slow oil leak from front timing cover area; Visible oil loss
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
The rear differential bearing started making a great deal of noise proportional to speed of vehicle. This is a safety problem. Part must be replaced at cost of nearly $3,000. Vehicle only has 65,000 miles and is only 2 months out of warranty. Research I have done reveals that this is a common problem with this vehicle. The dealer had the part in stock, which also suggests that this is a…
Had powertrain trouble with your 2013 Toyota Sienna?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2013 Toyota Sienna?
It's a documented issue but not catastrophic. 14 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Based on the 14 complaints filed, powertrain issues most often appear around 85,556 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2013/Toyota/Sienna.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.