2008 Mercury Mariner Transmission & Power Train Problems
NHTSA component category: POWER TRAIN · data through 07/14/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How power train ranks on this vehicle
Share of the 461 complaints citing each category; one complaint can cite several. Full breakdown on the 2008 Mercury Mariner overview page.
What owners report
“MY 08' MERCURY MARINER HAS ONLY 46,000 MILES ON IT AND NOW NEEDS A NEW TRANSMISSION. WHEN I GOT INTO MY CAR AND TRIED TO…”NHTSA complaint 10621162 — filed 08/09/2014
“THE CONTACT OWNS A 2008 MERCURY MARINER. THE CONTACT STATED THAT WHILE DRIVING AT VARIOUS SPEEDS, THE TRANSMISSION SLIPPED AND CAUSED THE VEHICLE TO SUDDENLY…”NHTSA complaint 10586615 — filed 05/05/2014
“LOANED THE CAR TO PARENTS TO TAKE TWO 3 YEAR OLDS TO DISNEY WORLD. WHILE ON THE INTERSTATE AT CRUISING SPEED, CAR STARTED TO RAPIDLY…”NHTSA complaint 10572797 — filed 03/17/2014
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2008 Mercury Mariner have transmission & power train problems?
Power Train is the #2 most-reported problem area on the 2008 Mercury Mariner: 55 of 461 complaints on file (11.9%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2008 Mercury Mariner have in total?
461 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 9 involved a crash, 0 involved a fire, 5 reported injuries, and none reported deaths.
What does NHTSA's power train category include?
NHTSA groups complaints about the transmission (automatic or manual), driveline, axles, transfer case and related parts under a single component category called POWER TRAIN. This page reports that category as NHTSA defines it.
