i have some codes dont know what they are help????? - 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 02-28-2006, 10:48 PM   #1
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Default i have some codes dont know what they are help?????

ok here they are
codes are PO300 and P1406 can any one tell me what they are and what i need to do or fix it


thanks robert
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Old 02-28-2006, 11:09 PM   #2
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P0300 is engine misfire
P1406 is EGR position sensor performance

I'll let the gearheads handle the repair part.

All of the trouble codes can be found in the techinfo (link'* at the top of the page) under general information.
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Old 03-01-2006, 12:20 PM   #3
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Well for the engine missfire basiilly give it tune-up and go from there
For egr I have no idea never had problem with the egr, but my guess would to get the egr value replaced.
I would most like give at tune-up 1st then see how it responed from there
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Old 03-01-2006, 12:28 PM   #4
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The EGR could be the misfire culprit as well.

Pull off the EGR and clean w/carb cleaner until the pintle valve is free moving. Most likely carbon build up has occured and it binding up the valve.
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Old 03-01-2006, 12:36 PM   #5
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I would certainly never disagree with a tune up for any car that hasn't had one lately, so that is a consideration. If you are in need of a good tune up, certainly do that first. After tune up you can choose to drive it for three trips to see if the MIL turns off or you can clear the DTC and take two consecutive trips, after which the MIL will relight if problem is not resolved.

If you have recently done a tune up and are sure of the results, then inspect the wiring harness and connector to the EGR Valve, first. Check the connector and pull it off and push it on a few times to loosen any corrosion, then use some dielectric grease on it before assembling it the last time. Check for worn or loose spots in the wiring.

If all'* well with the wiring and connector, then pull the EGR and look at the pintle to make sure there isn't a carbon build up. It can be cleaned.

Let us know what you find.
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