2004 Mercury Mountaineer 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 210 complaints citing each category; one complaint can cite several. Full breakdown on the 2004 Mercury Mountaineer overview page.
What owners report
“BEING HAVING PROBLEMS WITH REAR LIFT GATE [ NOT STAYING CLOSE, OPENS ANYTIME, IT WANTS TO BY ITSELF. MY TRANSMISSION PROBLEMS ERRATIC SHIFTING, HARD SHIFTING…”NHTSA complaint 10437405 — filed 11/27/2011
“THE TRANSMISSION FAILED ON MY 2004 MOUNTAINEER THE FIRST TIME IN JULY 2009 WITH ONLY APPROX 58,000 MILES. IT WAS UNDER WARRANTY. I WAS TOLD…”NHTSA complaint 10435347 — filed 11/12/2011
“TRANSMISSION FAILED AT 58,000 AND WAS REBUILT ( NOT REPLACED) UNDER WARRANTY. NOW LESS THAN 24,000 MILES AND 27 MONTHS LATER AT 84,000 MILES, TRANSMISSION…”NHTSA complaint 10435345 — filed 11/12/2011
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2004 Mercury Mountaineer have transmission & power train problems?
Power Train is the #3 most-reported problem area on the 2004 Mercury Mountaineer: 21 of 210 complaints on file (10%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2004 Mercury Mountaineer have in total?
210 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 11 involved a crash, 2 involved a fire, 16 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.
