NHTSA — Electrical System Problems

CarComplaints.com Seal Of This Might Hurt

CarComplaints.com Notes: The only area of real concern for 2011 Mazda CX-9 owners is the brake booster.

In 2014, Mazda extended the warranty on the 2007-2013 CX-9 brake booster to 7 years / 90,000 miles. However this extended warranty has expired, so buyer beware.

This Mazda CX-9 brake booster failure isn't terrible in terms of repair cost — it "only" costs $550 average to fix. However it is a safety issue when the brake booster fails as it increases stopping distance. Owners have reported having to stomp on the brake pedal, & crashes/injuries have been reported due to this CX-9 brake booster defect.

10.0

really awful
Crashes / Fires:
0 / 2
Injuries / Deaths:
0 / 0
Average Mileage:
54,414 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.

2011 Mazda CX-9 electrical problems

electrical problem

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2011 Mazda CX-9 Owner Comments

problem #5

Aug 202022

CX-9

  • miles

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

The front door windows no longer work. Most recently, the drivers side back door will NOT open. The lock is completely jammed - will not open or shut, which is a safety hazard for my child. The plastic parts in this car are failing and putting my family at risk.

- Albuquerque, NM, USA

problem #4

Dec 312018

CX-9

  • 110,000 miles
Our vehicle has water drains or "weep" lines for the sunroof. We recently had the electrical system stop/start, dash lights remain on constantly after sitting in the driveway during the rain. We learned that if the drains become blocked that water leaks into the cabin directly onto the body control module (BCM). Because the BCM is not in a sealed or water-proof case, yet is soaked in these conditions, the vehicle is subject to electrical failure as a result. Replacing the BCM costs about $1,000. When we started the car the dash lights that warn of an issue with many of the vehicles safety systems remained on. Others went off and soft of flashed. We could not determine if there was really an issue with all of the components flashing on the dash so we did not want to drive it for fear of an accident. Our vehicle was stationary (thank god). We waited for a while and were able to leave for home, but this condition is clearly a huge safety risk.

- Livonia, MI, USA

problem #3

Dec 162015

CX-9 6-cyl

  • 66,727 miles
The contact owns a 2011 Mazda Cx-9. the contact stated that while stopped at a stop light, the accelerator pedal was depressed but the vehicle failed to accelerate as the warning indicators flashed and the engine stalled without warning. The vehicle was taken to a dealer where it was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 66,727. Updated 06/15/16 the consumer stated she accelerated from a stop light, as she turned the corner. She then realized, she could not brake, or steer the vehicle. She hit the emergency brake and turned the vehicle off. The dealer believed it was a vacuum problem as she braked slightly when she turned the corned. Updated 06/16/16.

- Walnut Creek, CA, USA

problem #2

Jan 312015

CX-9

  • 65,000 miles
The contact owns a 2011 Mazda Cx-9. while driving 45 mph at night, the contact noticed a flickering light coming from the front end of the vehicle. The contact merged to the side of the road. After inspecting the vehicle, the contact noticed that flames engulfed the engine. The fire department extinguished the fire. A police report was filed. Neither the contact nor the passenger sustained any injuries. The cause of the fire was not determined. The vehicle was not repaired. The failure mileage was 65,000.

- Elizabeth, CO, USA

problem #1

Nov 152014

CX-9 6-cyl

  • 30,345 miles
While driving on interstate 77, North bound, at 55mph, other motorists informed me that my car was on fire underneath. There were no dashboard warning lights or signals that came on it light up as a warning sign. I pulled over to the side of the road, the fire department and sheriff's office put out the fire and the car was towed. The car is quite new and with very low mileage. Well maintained car. No recent work other than regular oil change. Mazda denies any problems with this car.

- Shaker Heights , OH, USA

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