NHTSA — Vehicle Speed Control Problems

CarComplaints.com Seal Of Pretty Good

CarComplaints.com Notes: Mazda included the 2009 Mazda CX-9 brake booster in a special extended warranty (now expired) that covered 2007-2013 model years.

However, brake booster complaints never materialized as a defect trend for the 2009 CX-9 — both with our complaint data & with the NHTSA's complaint data. So, we highly recommend this 2009 model year!

4.5

definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
24,500 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2009 Mazda CX-9 engine problems

engine problem

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2009 Mazda CX-9 Owner Comments

problem #1

Feb 012010

CX-9

  • 24,500 miles

A D V E R T I S E M E N T S

The tachometer of the car sticks in high revs (1500-2500),engine on, car in neutral, foot off the gas pedal, if the car is moving over 20-25mph (either by free falling a hill or being pulled) the tachometer varies the RPM reading to match speed just as if the car would be in 'd' position. I think the ECU has a glitch of some sort that ignores the gas pedal and the shift position if the car is moving. Taken to the dealership and they said car is working as designed, that the car will keep rpms to match speed in to avoid a engine slowdown or something similar. My concern is that the ECU should behave as expected so should the tachometer read 600-800 RPM when idling, regardless of the speed of the car if the transmission is in neutral, if not at any time the ECU may decide it should rev up the engine if the speed sensor goes bad.

- Marlborough, MA, USA

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