I have a 2001 mitsubishi diamante, and am having problems that seem to run rampant among this model/make. My heater core went out at about 100k miles; my ABS light stays on (due to a speed sensor fail), which renders the whole anti-lock system useless; and now my antenna mast is broken. All of these problems are pricey to fix, and most diamante users I have found experience at least a few of these conflicts. Another problem I have seen many comments about is transmission failure at 113k miles. My car has exactly that. On top of everything, it is winter, and anti-lock brakes are much preferred in icy weather. I am starting to smell antifreeze again, the warning sign to a failing heater core, which can leak onto a transmission computer and cause it to fail as well. I am beginning to worry about being stranded, and even being safe in my car. I know I am not the only one complaining, because I have been online all day reading forums from people with similar issues (see the following: http://www.carsurvey.org/reviews/mitsubishi/diamante/r76426/comments/page-5/). Something must be done!
The worst 2001 Mitsubishi Diamante problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Visibility56
- Engine14
- Brakes4
- Transmission4
- Suspension3
- Tires3
- Acceleration1
- Body1
- Driver assistance1
- Seat belts1
- Wheels1
Specific symptoms reported on the 2001 Mitsubishi Diamante
Recalls 2
Equipment: other: labels
- What is wrong
- Certain passenger vehicles fail to conform to the requirements of federal motor vehicle safety standard no. 208, 'occupant crash protection.' the bilingual english/spanish removable air bag warning labels affixed to the dash and to the sunvisor do not meet the size requirements of the standard.
- Risk
- This does not meet the requirements of the standard.
- Remedy
- Mitsubishi caribbean will mail a customer notification letter containing a written description and a graphic of the bi-lingual dashboard air bag warning label. In addition, all current 2000-2004 nativa owners will also receive replacement air bag alert labels for the sun visors. This recall is expected to begin during march or april 2005. The notification to the nativa owners is expected to begin during april or may 2005. Owners should contact mitsubishi caribbean at 1‑787‑251‑8715.
Recall number 04V428000 · Recall details
Equipment: other: owners/service/other manual
- What is wrong
- Certain sport utility and passenger vehicles fail to comply with federal motor vehicle safety standard no. 225, "child restraint anchorage systems." the owner's manual does not contain a step-by-step description for headrest adjustment when installing a child restraint system (crs) tether strap.
- Risk
- If the tether strap is improperly installed to the tether anchor, the child safety seat may not be sufficient restrained. In the event of a crash, the child could be injured.
- Remedy
- A letter outlining the problem will be sent to owners along with a sticker containing the correct instructions as well as instructions on where to affix the sticker in the owner's manual. The recall began on march 29, 2004. Owners should contact mitsubishi at 1‑888‑648‑7820.
Recall number 04V067000 · Recall details
Technical service bulletins for the 2001 Mitsubishi Diamante 66
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- This is a Dealer Letter sent to dealers informing that Mitsubishi Technical Training has launched the 3rd...
- This Technical Service Bulletin reviews the regulations that require a label showing the reduction in load...
- This Technical Service Bulletin provides instructions and material safety data sheets for removal of...
- This is a Dealer Letter sent to dealers informing that Mitsubishi Technical Training has launched the 2nd...
- This Technical Service Bulletin was sent to dealers to explain the difference between normal dew...
- This is a service newsletter (Tech Talk) that was sent out to dealers.
- This is a Technical Service Bulletin sent to dealers
- This is a message sent to dealers, to inform them that an update for MEDIC will be available.
- This TSB contains troubleshooting steps for diagnosis of various customer complaints relating to the audio...
- This is an index of Tech Talk newsletter articles released in 2012.
2001 Mitsubishi Diamante fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 3.5L 6‑cyl | FWD | 16 | 23 | 18 |
What 2001 Mitsubishi Diamante owners say
Most recent owner complaints, unedited.
Windows are fogging up do t a faulty heater core. I really don't mind repairing the car seeing that it has 120k on it.. I purchased the car brand new and this will be the 3rd heater core!!! What's going on!
Mitsubishi diamante infamous heater core problem antifreeze leaks into interior of car. Horrible sickening anti freeze smell, happens on an abundance of mitsubishi cars.
Heater core is causing the windows to fog up, the car to smell like antifreeze and may be damaging the ecu. There are hundreds of posts online about people having this problem over and over with this car. It is clearly a manufacturers defect and customers are left paying thousands of dollars fo the repair.
2001 mitsubishi diamante. We have had it about six months. I have had it in to a very reputable service station and have come up empty on the following problem. The car has new tires, this occurred before and after they were installed. During more aggressive turning the car gets very unstable, bad enough to lose control. The service shop checked out all the obvious front end stuff along with the three bushings on each front wheel assembly. For the most part the car tracks straight down the road and is smooth and true. It may be described as a little soft in handling but nothing severe until this situation occurs. The shocks and struts seem ok. The car has 70,000 miles?
Heater core went bad at 105,000 miles. This seems to be a manufactoring problem and mitsubihi should adress the issue.
My 2001 mitsubishi diamante's heater core went up. I have massive amounts of coolant leaking on my passenger side, thick smoke coming from my vents and a bad odor coming from the vents. I have read this is a very very common thing with mitsubishi's especially diamante's.
Just recently started having really foggy windows and started to notice sweet smell coming from car when heater/defrost was turned on. Notified dealer of problem and dealer quickly identified problem as heater core defect.
Tl*the contact owns a 2001 mitsubishi diamante. The windows fogged up when the air and heat were activated. The passengers could smell antifreeze. The dealer stated that the heater core failed due to defective o-rings and noticed antifreeze leaking onto the micro processor. The micro processor and heater core were replaced. The failure mileage was 70,000 and current mileage was 75,000.
Tl*the contact owns a 2001 mitsubishi diamante. The windows fogged up when the air and heat were activated. The passengers could smell antifreeze. The dealer stated that the heater core failed due to defective o-rings. The heater core was replaced. The current and failure mileages were 65,000.
Compare the 2001 Mitsubishi Diamante
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Questions about the 2001 Mitsubishi Diamante
Is the 2001 Mitsubishi Diamante reliable?
Owners have filed 78 complaints about the 2001 Mitsubishi Diamante, close to a typical Diamante model year.
What is the 2001 Mitsubishi Diamante year score?
The 2001 Mitsubishi Diamante scores 75 out of 100 (average). The score compares it with the other model years of the Mitsubishi Diamante: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2001 Mitsubishi Diamante?
Windows, wipers and visibility, with 56 complaints, typically around 58,000 miles. Next is engine (14).
How many recalls does the 2001 Mitsubishi Diamante have?
2 recalls, covering equipment.
What year does the Mitsubishi Diamante have the most visibility problems?
The Mitsubishi Diamante model years with the most visibility complaints are 2002 (71 complaints), 2001 (56 complaints) and 2003 (28 complaints).
What gas mileage does the 2001 Mitsubishi Diamante get?
Official estimates for the 2001 Mitsubishi Diamante range from 18 mpg combined. The most efficient version (3.5L 6-cyl, FWD) gets 16 city and 23 highway.
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