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Old 04-02-2011, 03:14 PM   #1
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Default Check engine soon light on 2005 bonnie

The light was coming on and going off, very intermittent. Dealer put on code reader and says I need to put in new thermostat and an ignition control unit. Temp gauge has never risen over 200 degrees, and everything seems to work fine. Any thoughts?
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Old 04-02-2011, 03:23 PM   #2
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A flashing SES light is a misfire, and has nothing to do with the thermostat. The ICM, perhaps, but not likely. Mostly likely cause is a bad coil, a bad spark plug wire, a bad spark plug, or possibly a bad injector. Have the engine scanned at autozone next time it flashes. You should see a code that is P030x the x will have a number between 0 and 6. That number is the problem cylinder, zero is random misfire Post up what you find and we will help you correct it.
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Old 04-02-2011, 10:58 PM   #3
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and dont take your car back to that dealer
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Old 04-04-2011, 09:17 AM   #4
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With the light coming on and off at times, not necessarily flashing only, there could be a bad thermostat that isn't letting the car heat up quick enough.

ICM'* have gone back and the best test would be a dealer with the proper equipment. I'm hesistant to say that'* bad, but I don't have the equipment to test them.
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Old 05-22-2011, 09:11 PM   #5
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I finally got codes they say came up
P0128, P0350, P1811 and P1350

Any thoughts?
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Old 05-22-2011, 09:19 PM   #6
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P0128 is engine coolant temp https://www.gmforum.com/showthread.p...65#post1390947

P0350 I do not have on my list.

P1811 is long shift. https://www.gmforum.com/showthread.p...89#post1429289

P1350 I don't have on my list.

Start with your engine coolant temp, if that'* not reading right it can cause all kinds of strange problems.
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Old 05-23-2011, 10:55 PM   #7
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Quote:
Originally Posted by Danthurs View Post
P0350 I do not have on my list.
P1350 I don't have on my list.
A quick Googling showed this:

"P0350 Ignition Coil Primary/Secondary Circuit Malfunction" (random/multiple coils)

P1350, when the car is not cranking, is a dead ICM.

Dan, P1350 seems legit, but you may want to verify P0350 before adding that to your list.
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