DTC P1257 on an L36??? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-16-2007, 12:53 PM   #1
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Default DTC P1257 on an L36???

I pulled my codes this morning after it wouldn't start with my astrostart and I pulled:

P0131, Bank 1 #1 O2 sensor circuit low voltage
and
P1257, Boost control fault system overboost.

How can I get the P1257 when I'm not supercharged??? Is this a problem I should worry about?
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Old 03-16-2007, 03:19 PM   #2
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Now thats funky...

Has anyone replaced the PCM in this car? That code is for the 1995 Vin 1 Only..

You sure have me intrigued

Also did the car start with the key?

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Old 03-16-2007, 05:30 PM   #3
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I guess the PCM could have been changed before I bought it in November '03.

When I went to start it with the autostart it started but died right away. It did this twice and on the third try it would just turn over repeatedly to no avail, so I stopped it. It started up with the key but didn't want to run very well, or at all for that matter, without me giving it gas. Once it warmed up for a couple minutes it was a little better. Then I drove the 45miles back home. I just got the oil changed yesterday, not sure if that matters. I think he put in 10W-30, I was going to ask for 5W-30 but forgot.

One more thing, it was 17*F this morning according to my ECC and my code reader said that my trans temp was 4.5*F...
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Old 03-17-2007, 12:44 PM   #4
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You wouldn't have happened to see a code 1350 or 1361 somewhere along the line?

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Old 03-18-2007, 05:25 PM   #5
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I don't recall seeing either of those codes.
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Old 03-19-2007, 09:30 PM   #6
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I'm just gonna clear those codes tomorrow and see if they come back tomorrow morning.
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Old 03-20-2007, 01:55 PM   #7
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Let us know what you find..

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Old 03-24-2007, 01:35 AM   #8
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The code didn't come back even after having the same issues at startup. I tried to start it up again, it ran for a few seconds then died. It doesn't seem to be a problem if I plug it in for the night.
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Old 03-24-2007, 11:12 AM   #9
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Quote:
Originally Posted by lglarum
The code didn't come back even after having the same issues at startup. I tried to start it up again, it ran for a few seconds then died. It doesn't seem to be a problem if I plug it in for the night.

Ran for a few seconds? As in Start.... 1, 2 Dies... Kinda like Vrrrrrrrrrrrrrrrr hissssss Dead?

Does it do this all of the time or just on the first try?

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Old 03-25-2007, 12:15 PM   #10
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Quote:
Originally Posted by jr's3800
Ran for a few seconds? As in Start.... 1, 2 Dies... Kinda like Vrrrrrrrrrrrrrrrr hissssss Dead?

Does it do this all of the time or just on the first try?
It starts, gets to a high idle for a few seconds, then it will try to go to a normal idle and then goes too low and dies. It'* fine if I'm in the car giving it just a lil gas to keep it runnin, and after 2-3 minutes of that it will idle fine.
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