2012 Hyundai Equus Engine Problems
- Complaints
- 3about this part
- Share
- 38%of 8 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the engine of the 2012 Hyundai Equus, 38% of the 8 complaints for this model year.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I was driving on the highway and my transmission due to a failed transmission service done to my vehicle caused my vehicle’s transmission to overheat a blowout my transmission cooler and mix coolant and transmission fluid unknown to me because of a clogged transmission cooler line improperly flushed instead of replaced by the Patrick Hyundai dealership there could’ve been and electrical fire or a crash due to these things.”
NHTSA complaint #11748611, filed 2026-07“I am reporting a severe vehicle safety hazard involving a sudden loss of motive power and extreme thermal failure on my 2012 Hyundai Equus Signature 5.0L. In July 2022, at 88,845 miles, an authorized Hyundai dealership replaced the transmission under a factory warranty event. Rather than replacing the transmission oil cooler assembly—which was contaminated with heavy metal shrapnel from the original mechanical breakdown—the servicing dealer chose to only flush the lines, creating a latent fluid restriction. …”
NHTSA complaint #11749120, filed 2026-07“I am writing to log an immediate emergency update to my vehicle safety report regarding my 2012 Hyundai Equus Signature 5.0L. On Friday afternoon, July 10, 2026, Hyundai Motor America’s corporate office formally initiated a high-level Tier-2 supervisor review to investigate the severe powertrain safety hazard currently present on my vehicle—specifically, a catastrophic internal rupture of the transmission fluid cooler loop that has cross-contaminated and flooded my engine block infrastructure and main radiator with high-velocity metallic shrapnel. …”
NHTSA complaint #11749721, filed 2026-07Related service bulletins
- 11038456Oct 7, 2026Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin provides the inspection and repair procedures…
- 10160100Apr 15, 2019When servicing a vehicle with a ?Check Engine light? and any of the DTCs listed below, follow the Service Procedure and replace the related solenoid and E-module.
- 10158797Mar 7, 2019If you are servicing a vehicle with a ?Check Engine light? and any of the DTCs listed below, follow the Service Procedure and replace the E-module.
Engine: other model years
Other parts of the 2012 Hyundai Equus
4 complaintsSuspension
2 complaintsAir bags
1 complaintsElectrical system
1 complaintsElectronic stability control
1 complaints
← All problems reported for the 2012 Hyundai Equus
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology