This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
full bulletin at NHTSA ↗2018 Chevrolet Tahoe engine problems
moderate Owners of the 2018 Chevrolet Tahoe have filed 14 NHTSA complaints about the engine 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 →
Complaints
14
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2015 Tahoe | 18 |
| 2016 Tahoe | 12 |
| 2017 Tahoe | 10 |
| 2018 Tahoe (this page) | 14 |
| 2019 Tahoe | 15 |
| 2020 Tahoe | 8 |
| 2021 Tahoe | 112 |
| 2022 Tahoe | 56 |
When does it fail?
Of the 14 engine complaints filed for the 2018 Chevrolet Tahoe, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 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.
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 information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
full bulletin at NHTSA ↗The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
full bulletin at NHTSA ↗This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in other states.
full bulletin at NHTSA ↗This warranty administration bulletin provides policy information on vehicles outside of a California Emissions State who move to and register their vehicle in a California Emission State may be entitled to the 7 year, 70,000-mile Emission Select State Component Limited Warranty.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners describe premature engine failures starting as early as 22,949 miles. The most common failure pattern involves hydraulic lifters failing, which destroys the camshaft and valve train. Before catastrophic failure, owners report abnormal rattling or knocking sounds at startup, engine stalling, and loss of power while driving—sometimes without warning lights until the damage is severe. One owner's engine failed completely at 83,000 miles due to crankshaft push rod damage. Another lost all power at 45 mph and faced a $17,000 engine replacement. Mechanics confirm this is a chronic issue specific to 2018 Tahoes.
Transmission lockup and failure also appear in these complaints, sometimes occurring alongside engine problems. One owner paid $15,000 in repairs at 55,000 miles (just out of warranty) and received only $3,000 assistance from Chevrolet; the dealer declined warranty coverage. Fuel pump failures recurring even after three replacements add to reliability concerns. While NHTSA Campaign 25V274000 addresses engine and cooling issues, affected owners report their VINs were excluded from the recall. Dealers cite back-ordered parts and long repair timelines, leaving vehicles at dealerships for extended periods.
Same Chevrolet Tahoe engine reports on nearby years: 2015 · 2016 · 2017 · 2019 · 2021
Failure modes owners describe
Lifter and Camshaft Failure
Hydraulic valve lifters fail, causing the camshaft to be destroyed or damaged. This results in abnormal rattling and knocking sounds during engine startup or operation, leading to complete engine failure or catastrophic valve train damage.
When: Between 55,000 and 104,163 miles; one case at 90,000 miles; one case at 22,949 miles
Symptoms owners cite: Abnormal rattling and knocking sounds at startup; Engine stalling while driving; Loss of motive power; Check engine warning light; Vehicle sluggish or underpowered on hills and highways; Misfire in multiple cylinders
Codes mentioned: Camshaft and valve train damage, SMR lifter failure, Crankshaft push rod failure, Cylinder misfire
Repairs/costs cited: Engine replacement required in multiple cases; dealer parts back-ordered in at least one case; repair costs cited between $15,000 and $17,000; Chevrolet provided $3,000 assistance in one case
Recalls/TSBs owners mention: NHTSA Campaign 25V274000 (Engine and Engine Cooling) mentioned but affected VIN not included in recall; Chevrolet provided $3,000 assistance toward $15,000 repair in one case; some consumers advised to file NHTSA complaints
Fuel Pump Repeated Failure
Fuel pump fails repeatedly even after three separate replacements, causing delayed or failed engine starts and unexpected stalling while driving.
When: Repeated occurrences over vehicle ownership
Symptoms owners cite: Vehicle may not start immediately; Delay in starting; Vehicle shutting off unexpectedly while driving; Engine not running properly
Repairs/costs cited: Fuel pump replaced three times; uncertainty about long-term effects of E85 fuel use on flex-fuel vehicle
Transmission Lockup and Failure
Transmission either suddenly locks up while driving or fails internally, requiring complete replacement. Occurs without warning and mechanics describe it as a chronic issue with this model generation.
When: One case at 55,000 miles; one case around 4 years old; one case on highway
Symptoms owners cite: Transmission suddenly locked up while driving; Transmission slippage; Vehicle stopped on highway; No warning lights before failure
Repairs/costs cited: Transmission replacement required; $15,000 repair quoted in one case (with $3,000 Chevrolet assistance); dealer cited as back-ordered parts in transmission/engine combined failures
Recalls/TSBs owners mention: Chevrolet provided $3,000 assistance in one combined transmission/engine failure case; owners report this is a persistent issue with 2018 Tahoes
Crankshaft and Internal Engine Damage
Crankshaft failures, including push rod damage and cylinder damage, result in complete loss of engine power and require full engine replacement.
When: One case at 83,000 miles; one case at approximately 45 mph highway speeds
Symptoms owners cite: Sudden loss of motive power while driving; Engine power reduced and eventual engine shutdown; Vehicle would not crank back up; Check engine and ABS warning lights
Codes mentioned: Crankshaft push rod failure, Cylinder damage
Repairs/costs cited: Engine replacement required; one case quoted at $17,000; vehicle towed and unable to restart
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
AC stopped blowing cold air due to a broken condenser weld issue commonly found in previous recalls 2014-2017
The contact owns a 2018 Chevrolet Tahoe. The contact stated that while driving approximately 65 MPH, the vehicle decelerated and abruptly slowed down and lost motive power. The check engine warning light was illuminated. The vehicle was towed to an independent mechanic who informed the contact that the SMR lifter and the engine failed. The contact called the local dealer who informed her that the…
Had engine trouble with your 2018 Chevrolet Tahoe?
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 2018 Chevrolet Tahoe?
It's a documented issue but not catastrophic. 14 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?
Based on the 14 complaints filed, engine issues most often appear around 75,028 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 $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/2018/Chevrolet/Tahoe.
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.