This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota vehicles.
full bulletin at NHTSA ↗2012 Toyota Tacoma engine problems
moderate Owners of the 2012 Toyota Tacoma have filed 91 NHTSA complaints about the engine, typically surfacing around 61,236 miles at roughly $3,100 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Failure mileage
Complaints
91
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2008 Tacoma | 13 |
| 2009 Tacoma | 14 |
| 2011 Tacoma | 5 |
| 2012 Tacoma (this page) | 91 |
| 2013 Tacoma | 5 |
| 2014 Tacoma | 4 |
| 2015 Tacoma | 4 |
| 2016 Tacoma | 18 |
When does it fail?
Of the 91 engine complaints filed for the 2012 Toyota Tacoma, 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
Of the 19 model years of Toyota Tacoma we track for engine problems, this one carries the most owner complaints on file — 91.
Engine accounts for 31% of every owner complaint on file for this vehicle — the dominant problem area across 11 categories tracked.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine 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.
This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota vehicles.
full bulletin at NHTSA ↗This is to advise of various price adjustments that will affect Toyota Genuine Motor Oil and Long Life Coolant, effective March 1, 2024. These products are ordered through the Toyota Complete Maintenance Care (TCMC) website.
full bulletin at NHTSA ↗Renotification Postcard: There is a possibility that moisture in the air may cause a filter in the vehicle emissions system to degrade. This degradation could cause damage to other parts of the vehicle emission system and illuminate the check engine light (Malfunction Indicator Light).
full bulletin at NHTSA ↗TT: HVAC drain tube is found to be blocked/clogged.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The secondary air injection system on the 2012 Tacoma is failing prematurely and predictably, typically between 24,000 and 88,000 miles. Owners describe the same sequence: Check Engine Light and Traction Control Off light come on suddenly while driving, the truck enters limp mode, and speed is capped at 20–40 MPH—sometimes dropping to as low as 25 MPH. Engine RPM maxes out around 2,500. Most failures trigger diagnostic codes P2440 and P2442 (secondary air injection switching valves stuck open or closed).
The danger is acute and repeated across complaints. Owners report near-collisions while merging onto highways, being nearly rear-ended by heavy traffic, getting stranded in mountains, and having to pull onto shoulders with hazard lights because following vehicles had to brake hard. One owner working ski patrol was forced to borrow a two-wheel-drive vehicle due to the failure and got stuck overnight in a seasonal storm.
Owners attribute valve failure to moisture intrusion, corrosion, and carbon buildup inside the assemblies. One narrative details foam degradation inside the pump being sucked into the fan, burning it out and allowing debris into the valve mechanism. Repair bills run $1,500–$2,300 including parts and labor. Toyota's 8-year/80,000-mile emissions warranty does not cover these parts. Toyota issued a Technical Service Bulletin but has not recalled the Tacoma—though it extended warranty coverage for the identical parts on Tundra and Sequoia models. Dealers acknowledge this as a known issue; 2013 Tacomas were reportedly redesigned to prevent the same failure. Several owners were told to keep repair receipts in hopes of eventual reimbursement if a recall is issued.
Same Toyota Tacoma engine reports on nearby years: 2009
Failure modes owners describe
Secondary Air Injection Valve Stuck Open/Closed
The secondary air injection switching valves become stuck in the open or closed position, triggering diagnostic codes P2440 and/or P2442. Owners and dealers attribute this to moisture intrusion and corrosion inside the valve assemblies, combined with carbon buildup and degradation of internal foam components. One narrative explicitly describes foam inside the secondary air pump that degrades, gets sucked into the fan, burns it out, and allows debris to enter and jam the valves.
When: Typically between 24,000 and 88,000 miles; most commonly reported in the 30,000–65,000 mile range on 2012 model year trucks.
Symptoms owners cite: Check Engine Light illuminates; Traction Control Off light illuminates; Vehicle enters limp mode, limiting speed to 20–40 MPH; Engine RPM capped at around 2,500 RPM; Severe loss of power and acceleration; Inability to merge or maintain highway speeds; Sudden, unexpected power loss while driving
Codes mentioned: P2440, P2442, P2436, P2441, P2446
Repairs/costs cited: Secondary air injection pump and/or diverter valve assembly replacement required. Owners report parts costs ranging from $480–$500 per valve assembly (two assemblies needed, one per bank) plus $200–$500 labor, with total repair bills from dealers ranging from $1,075 to $2,300+ CAD including tax. One narrative mentions redesigned parts after repair to prevent recurrence. Several owners report being asked to keep receipts in hopes of eventual reimbursement if a recall is issued.
Recalls/TSBs owners mention: Toyota issued a Technical Service Bulletin (TSB) but has not recalled the part for Tacomas. Toyota extended warranty coverage and reimbursement programs for the same parts on 2007–2010 Tundra and 2008–2010 Sequoia models (reported as 10-year/150,000-mile extended warranty on Tundra). Some 2012 Tacomas reportedly fell under Special Service Campaign 20TC01, but that campaign has expired. Federal Emission Control Warranty (8 years/80,000 miles) does not cover these components according to owners' warranty guides. Owners report that Toyota service advisors acknowledge the issue as a 'known problem' and that 2013 Tacomas were redesigned to prevent the same failure.
Secondary Air Injection Pump Failure
The secondary air injection pump degrades and fails, often accompanied by water contamination within the system. Narratives reference moisture and corrosion causing the pump motor to burn out, with one owner noting that foam degradation inside the pump is sucked into the fan impeller.
When: Occurs alongside or independently of valve failures; reported at 35,000–88,000 miles.
Symptoms owners cite: Check Engine Light and Traction Control Off light; Loss of engine power; Limp mode activation
Repairs/costs cited: Replacement air injection pump assembly required; one narrative states parts from Express Oil Change and Tire Engineers quoted at around $1,500 for the pump (parts only, not labor). Dealer estimates including pump and valve replacement total $1,798–$2,300+.
Recalls/TSBs owners mention: Toyota has not issued a recall for Tacoma air injection pumps, though the same part on Tundra and Sequoia models received extended warranty and reimbursement programs. Dealers acknowledge the issue but are not authorized to cover the repair cost under the vehicle's original warranty.
Rattling Noise from Secondary Air Injection System
One narrative reports a rattling noise under the hood on the driver's side that occurs in the 15–40 MPH range. The owner returned three times to the dealership; the dealer cited a Technical Service Announcement (TAS) case number and declined to repair the noise until it becomes a recall, despite the sound becoming progressively louder.
When: Not specified; first noticed during normal driving.
Symptoms owners cite: Loud rattling noise under the hood on driver's side; Noise occurs in 15–40 MPH speed range; Noise progressively worsens
Repairs/costs cited: No repair performed. Dealer suggested trying higher-quality gasoline but found no mechanical remedy. Owner was told no repair would be made until the issue becomes a recall.
Recalls/TSBs owners mention: Dealer cited a TAS case number and refused to repair; stated the issue would not be addressed until it becomes a recall.
Synthesized from 91 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
Failure of the secondary air injection system p2440 and p2442, while the vehicle was moving onto a city street from a parking lot. When accelerating immediately there was a decrease in power and the check engine light along with the "trac off" light illuminating simultaneously. The vehicle has a now maximum speed of around 55 MPH and extremely slow to accelerate being almost dangerous on busier…
Air injection pump and diverter valve assembly failed causing vehicle to enter limp mode. Vehicle was moving at low speed from a fresh start up. Toyota has recognized the issue on the tundra truck and extended 150k mile warranty on the part. They have not extended the same consideration on the tacoma. Based on research and discussion with dealer it is a known issue on the 2012 tacoma. Cost…
I got the engine lights on in the morning starting the truck on nov 3, and truck went into limp mode. Got it home and let it sit for a bit and then it seemed to be okay accelerating but the engine lights were still on. Took it to Toyota and was reading the dreaded p2442 secondary air injection system code. They cleared the code and drove it around; cleared again they deemed it okay and charged me…
My 2012 Toyota tacoma check engine and traction control light came on. Truck went in limp mode, which was very unsafe. Took my truck to auto zone to have the codes read. My truck code was p2442. Air injection system switch valve stuck open. This is a known issue to Toyota tundra trucks but not for the tacoma.
Driving on the street to work one morning, the trac off and check engine lights both suddenly appeared. I then noticed that my truck was not able to accelerate past ~40 MPH. Going uphill, my truck was limited to only ~20 MPH. My truck went into this "safe mode." I connected an OBD device and the came up with the following two codes: p2440 and p2442. The codes refer to "secondary air…
Engine code p2442 & p2440: secondary air injection system switching valve bank 2. Truck only has 40,000 miles on it. Dealer what $1800.00 to make repairs. Toyota has a problem with the part and they need to fix it. Nothing like having numerous failures and leaving the customer to pay for the poor engineered part. *tr
Had engine trouble with your 2012 Toyota Tacoma?
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 engine problem on the 2012 Toyota Tacoma?
It's a documented issue but not catastrophic. 91 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 87 complaints that reported odometer mileage, most engine failures cluster between 49,000 and 79,000 miles, with the median around 61,236. A quarter of owners report trouble before 49,000; a quarter make it past 79,000. 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 $3,100 for engine 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 engine?
No active recalls currently cover engine 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/Tacoma.
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.