ECM/PCM Problems In Cold Weather
#1
ECM/PCM Problems In Cold Weather
So my first winter with my 8 is starting. It's an '04, just had her refurb put in about 4k miles ago. Just changed the oil and put in Royal Purple 5w-20.
The first day we got down below freezing was about 3 days ago, serious frost on everything that morning. When I got in my car it was roughly 30F outside. Turned her on and to my dismay, the CEL was on.
Later that day I turned her on and the CEL was still there, so I drove to Autozone (car really didn't get a chance to fully warm up by the time I got there). They pulled the code and it was P06091 or something close, I'll verify it later, but it came up in mazda's system as PCM Malfunction. When I went up to mazda they told me if I had to replace it, it would run be a grand, and that they wanted to first try and reprogram it... Well I'm not really in the mood to spend extra money before spending over 1000 bucks.
So I walked out, reset the NVRAM (at least I think that's what the 20 pedal pushes resets)... The CEL disappeared and did not come back the rest of the day. The next day, I had the exact same problem in the morning (~32F), and once again it stayed on the second time I started the car and it was around ~45F. Then finally the third time when I went home from work it was around the same temp, but the car had been fully warmed up and driven the last time. This time there was no CEL when I turned her on.
Today, I woke up and it was around 28F, CEL when I started her. drove to work and she was pretty warm when I got there. This afternoon I drove across town it was about 60F and the CEL was still on, but she was pretty warm by the time I shut her off. 3rd time's a charm, as when I drove back across town again, the CEL was off when I started her. Should theoretically stay off the rest of the day.
Any ideas?
The first day we got down below freezing was about 3 days ago, serious frost on everything that morning. When I got in my car it was roughly 30F outside. Turned her on and to my dismay, the CEL was on.
Later that day I turned her on and the CEL was still there, so I drove to Autozone (car really didn't get a chance to fully warm up by the time I got there). They pulled the code and it was P06091 or something close, I'll verify it later, but it came up in mazda's system as PCM Malfunction. When I went up to mazda they told me if I had to replace it, it would run be a grand, and that they wanted to first try and reprogram it... Well I'm not really in the mood to spend extra money before spending over 1000 bucks.
So I walked out, reset the NVRAM (at least I think that's what the 20 pedal pushes resets)... The CEL disappeared and did not come back the rest of the day. The next day, I had the exact same problem in the morning (~32F), and once again it stayed on the second time I started the car and it was around ~45F. Then finally the third time when I went home from work it was around the same temp, but the car had been fully warmed up and driven the last time. This time there was no CEL when I turned her on.
Today, I woke up and it was around 28F, CEL when I started her. drove to work and she was pretty warm when I got there. This afternoon I drove across town it was about 60F and the CEL was still on, but she was pretty warm by the time I shut her off. 3rd time's a charm, as when I drove back across town again, the CEL was off when I started her. Should theoretically stay off the rest of the day.
Any ideas?
#4
Administrator
https://www.rx8club.com/series-i-trouble-shooting-95/dtc-p0610-62049/
read the snap-on post especially. the only way to test it is to flash it/configure it. the the code comes back after the configuration ... it's new pcm time. make sure they show you the failure
read the snap-on post especially. the only way to test it is to flash it/configure it. the the code comes back after the configuration ... it's new pcm time. make sure they show you the failure
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
#5
Wanted to add that the last time I drove it tonight it was around 45F and it still had no CEL. I don't think we're going to hit freezing again tonight, so we'll see if it still comes on in the morning. Also note the day after I first tried the reset, I tried it again not too much later the next time I got in the car, and it stayed that time (although disappeared the next time I turned her on).
#9
Would the PCM have been flashed when I got my reman swapped in? I'm going to have to set up an appointment with Mazda... they'll be glad to finally get some money out of me...
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