1997 Bonneville with error codes P0121 and P0108 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-26-2009, 03:27 PM   #1
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Default 1997 Bonneville with error codes P0121 and P0108

Anybody with any ideas?? We are thinking it'* the Map sensor. Any suggestions, please feel free to give me your input!

Thanks!
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Old 01-26-2009, 03:29 PM   #2
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P0108 EGR Barometric Pressure Sensor Input Signal is out of Self-Test Range.

P0121 In-Range Operating Throttle Position Sensor circuit failure.

Start by testing for vac leaks.
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Old 01-26-2009, 03:48 PM   #3
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Will this cause anymore damage if we continue to drive the car short distances while we wait for someone to look at it?
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Old 01-26-2009, 04:13 PM   #4
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Hard to say without knowing what the problem is. I would suggest not driving it. But if you must, drive as little as possible.
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Old 01-26-2009, 07:09 PM   #5
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NEVER replace a part based only on the DTC definition. Each DTC has a set of testing procedures, instructions and flow charts that must be followed to confirm the location of the problem. This information is found in the vehicle'* service manual. Always refer to the vehicle'* service manual for detailed testing instructions.
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Old 01-26-2009, 07:15 PM   #6
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I've seen hundreds of error codes that were nothing more then a vac leak. Generally when you have multiple codes that are different, it'* a leak. When checking for a vac leak, make sure you check the EGR tubes. They crack some times and get missed a lot. Spray carb cleaner on all the lines while the engine is running and listen for changes in RPM.
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Old 02-05-2009, 12:25 AM   #7
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I just had both these codes on my 1998 Bonneville. Since I do not have the means to run the tests that the factory manual suggest, I went looking for vacuum leaks. Found my MAP sensor'* rubber seal was pushed down into the PCV housing and not on the MAP barb. I replaced the MAP that of course came with a new seal and it fixed it.

But I would do as suggested above, check for vacuum leaks around the throttle body (squirt with a carb cleaner while running, idle will rise if the carb cleaner momentarily fills a leak). Also take the PCV top off which the MAP is plugged into and make sure it is all sound. Also while you're at it change the PCV valve, only $2.50 and it is before the MAP and could cause anomolies.

Last edited by Bigfoot; 02-05-2009 at 12:30 AM.
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