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CarNOOB 8/22/2014

2002 Mazda Protege5 Base 4 Cyl 2.00L

Transmissions & Drivetrains

2002 Mazda Protege5 shifts into lower gear while driving at high speeds

2002 Mazda Protege 5, 110k, Automatic Transmission
First time problem started, while driving 75mph, I tried to pull out the AC charger because lights were dimming, and the car shot into a lower gear (ran at higher rpm). Pulled over, turned off car and had no problem restarting. Engine light turned on and off later that night
Second time, while driving 70 mph, the car shot into a lower gear. Pulled over, turned off car and had no problem restarting it. Same time while driving, I was at a stop light about to accelerate when the car completely shut off. I had no problem restarting it about a minute later.
Another thing that happened when I was revving the car in neutral, there was a loud pop.
I've gotten code p0340 and p0400. Thanks for the help.

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