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 Service Bulletin No. T-SB-0012-13 is obsolete and any printed versions should be discarded.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 ↗2012 Toyota Tundra powertrain problems
severe Owners of the 2012 Toyota Tundra have filed 19 NHTSA complaints about the powertrain, typically surfacing around 87,000 miles 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 →
Failure mileage
Complaints
19
Recalls
0
Avg fix
$2,500
| Model year | powertrain complaints |
|---|---|
| 2008 Tundra | 37 |
| 2009 Tundra | 8 |
| 2011 Tundra | 17 |
| 2012 Tundra (this page) | 19 |
| 2014 Tundra | 5 |
| 2016 Tundra | 5 |
1crash
1fire
When does it fail?
Of the 19 powertrain complaints filed for the 2012 Toyota Tundra, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 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 11 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.
Technical Instructions: In certain 2012 ? 2014 Model Year Toyota Tundra and Sequoia vehicles equipped with a 5.7 Liter gasoline or 5.7 Liter-Flex Fuel engines, the Engine Control Module (ECM) may set a Diagnostic Trouble Code (DTC) if debris/ice becomes lodged in the air switching valve. If this occurs, the Malfunction Indicator (Check Engine) Light could illuminate and the vehicle could enter a ?Fail-Safe? Mode (also known as ?Limp-Home? Mode). If this occurs the vehicle?s power and speed will be reduced, which could inconvenience you and require immediate repair.
full bulletin at NHTSA ↗Technical Instructions: In certain 2012 ? 2014 Model Year Toyota Tundra and Sequoia vehicles equipped with a 5.7 Liter gasoline or 5.7 Liter-Flex Fuel engines, the Engine Control Module (ECM) may set a Diagnostic Trouble Code (DTC) if debris/ice becomes lodged in the air switching valve. If this occurs, the Malfunction Indicator (Check Engine) Light could illuminate and the vehicle could enter a ?Fail-Safe? Mode (also known as ?Limp-Home? Mode). If this occurs the vehicle?s power and speed will be reduced, which could inconvenience you and require immediate repair.
full bulletin at NHTSA ↗TechTip: Condition - The vehicle may be difficult to start or have an abnormally low or rough idle after the battery has been disconnected or power to the Engine ECM has been interrupted.
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 ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2012 Tundra exhibits a dominant failure pattern in the secondary air injection system where moisture accumulates and corrodes the relay and switching valve, forcing the engine into limp mode and limiting acceleration to 25 mph or less. Owners report Toyota issued TSB-0160-11 and extended warranty coverage for earlier model years and the 5.7L engine, yet refuses to cover 2012 models with the 4.6L engine despite identical fault codes (P0418, P2442) and symptoms. Repair costs run $2,000–$3,500+. Owners describe sudden power loss on highways and merge ramps as a serious safety hazard; one owner nearly collided with traffic unable to accelerate properly entering an interstate.
Transmission issues surface in two forms: one owner reports internal gear breakage and complete failure shortly after mud running, with Toyota denying warranty by claiming abuse despite normal fluid levels and zero diagnostic codes; another describes sluggish shifting between 1st and 2nd gear requiring full replacement.
Flex fuel models from Gulf States Toyota show incorrect fuel alcohol concentration readings that trigger rough starts, power dropout, and misfiring—dealers only offer temporary computer re-flash with no permanent fix available. Rear wheel bearing premature failure causes grinding noise and safety concerns per multiple forum reports. One tire sidewall separation event at highway speed while towing resulted in a crash. An engine cam tower seal leak produces oil burning and smoke.
Same Toyota Tundra powertrain reports on nearby years: 2011
Failure modes owners describe
Secondary Air Injection System Water Intrusion / Relay & Valve Failure
Moisture accumulation corrodes secondary air injection system components (relay and switching valve), causing limp mode and loss of acceleration. Owners report Toyota has issued TSB-0160-11 and extended warranties to certain model years but excludes 2012. Codes P0418 and P2442 are typical; check engine light and traction control warning light activation occur.
When: Multiple occurrences reported; symptoms trigger on startup or during highway driving; one owner at 115,000 miles
Symptoms owners cite: Sudden loss of acceleration power; Vehicle enters limp/fail-safe mode reducing power by 50% or limiting speed to 25 mph; Check engine light and traction control warning light illumination; Skid control warning light activation; Vehicle unable to accelerate uphill or merge onto highway safely; Engine low-power mode activation
Repairs/costs cited: Repairs cost $2,000–$3,500+ for relay and valve replacement. One owner cited out-of-pocket expense of $3,034.87 after Toyota warranty denial.
Recalls/TSBs owners mention: TSB-0160-11 acknowledges the defect. Toyota issued extended warranty (10 years/150,000 miles) for pre-2012 model Tundras but refuses to cover 2012 and later models despite identical failure modes. Warranty policy bulletin POL17-02 referenced but not applied to 2012 model.
Transmission Internal Failure
Internal transmission component failure (gear breakage) resulting in total transmission burnout. One owner's transmission failed immediately after brief off-road use; Toyota denied warranty coverage claiming abuse despite normal fluid and temperature levels and zero transmission diagnostic codes. A separate owner reported transmission failure requiring complete replacement at 115,000 miles.
When: One failure occurred after 2–3 minutes of mud running; another at 115,000 miles
Symptoms owners cite: Improper gear shifting on freeway acceleration; Transmission 'burned up' or internal gear breakage; Sluggish shifting from 1st to 2nd gear with jumping during shifts
Repairs/costs cited: One owner reported dealer determined gear broke internally; another coworker traded in truck because transmission could not be fixed. Complete transmission replacement required in at least one case.
Recalls/TSBs owners mention: Warranty denied based on assumption of abuse (mud exposure and rocking maneuver), despite mechanic confirming normal fluid levels, normal temperatures, and zero transmission codes. Owner disputes abuse claim.
Flex Fuel System Alcohol Concentration Sensor Malfunction
Engine computer incorrectly reads fuel alcohol content, sensing E85 when regular gasoline (10% or less) is present. Affects flex fuel models sold by Gulf States Toyota. No final fix or service bulletin available; only interim solution is dealer computer re-flash.
When: Multiple instances reported; one owner experienced recurrence after re-flash
Symptoms owners cite: Rough cold starts and idle; Power loss and sudden RPM/power dropout; Engine missing (misfiring); Reduced fuel economy
Repairs/costs cited: Temporary fix: dealer checks alcohol concentration reading and re-flashes computer. Dealers advise against aggressive acceleration. Issues occasionally return for some owners.
Recalls/TSBs owners mention: No final fix or service bulletin available as of March 2013. Dealers only authorized to perform computer re-flash and advise restraint in acceleration.
Rear Wheel Bearing Premature Failure
Sealed rear wheel bearings designed for vehicle lifetime fail prematurely, causing grinding noise. Owner found multiple similar reports on internet Tundra forums, indicating systemic problem not isolated incident.
When: Grinding noise most noticeable between 30–60 mph; exact mileage not stated
Symptoms owners cite: Grinding noise in rear end; Noise most noticeable at 30–60 mph
Repairs/costs cited: Dealer diagnosis confirmed rear wheel bearing failure requiring replacement.
Tire Sidewall Separation / Failure
Front driver-side tire experienced complete sidewall separation at highway speed while towing, causing vehicle to spin and crash into ditch. Toyo Open Country tires were original equipment; replaced with Michelin. Rear tires still had 60% tread at time of incident.
When: At 76 mph highway speed while towing trailer
Symptoms owners cite: Tire vibration and abnormal grinding noise; Complete sidewall separation; Traction control warning light illuminated
Repairs/costs cited: Tire replaced with Michelin tires; credit issued for two tires. Vehicle crashed into ditch as result of tire failure.
Cam Tower Seal Oil Leak
Faulty cam tower seal design allows oil to leak from engine front and manifold area. Oil burns off on hot engine surfaces, producing visible smoke.
Symptoms owners cite: Oil leak from engine front and manifold; Smoke from burning oil
Synthesized from 19 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
Driveing 30 miles east of dickinsen noth dakata front drivers tire blew cruise set at 76 MPH speed limit 75mph bought new tires in duluth minnisota michelin tires to replace toyo open country bought from les schwab tires battle ground wa.. The whole side wall seperated completely from the tire looking at the other three they determained there was still 60% tread life at time of incident. They…
Tl* the contact owns a 2012 Toyota tundra. The contact stated that while driving 35 MPH and towing a trailer, the vehicle started to vibrate as the front passenger side tire exhibited an abnormal grinding noise. The contact mentioned that the traction control warning light was illuminated, causing the tires to seize. As a result of the tire failure, the vehicle began spinning and crashed into a…
A grinding noise began to develop in the rear end of the truck. The noise was most noticeable between 30 and 60 MPH. I took the truck to a Toyota dealership for diagnosis and they determined the rear wheel bearings had failed. These bearings are sealed, require no maintenance, and should be designed to last the lifetime of the truck. This is a safety concern because a bearing failure could…
Had powertrain trouble with your 2012 Toyota Tundra?
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 2012 Toyota Tundra?
It's a meaningful issue. 19 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Across the 15 complaints that reported odometer mileage, most powertrain failures cluster between 18,000 and 97,000 miles, with the median around 87,000. A quarter of owners report trouble before 18,000; a quarter make it past 97,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
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/2012/Toyota/Tundra.
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.