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Old 04-12-2014, 03:33 PM   #1
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Default Code flash C1298 & U1040 Help?


Having issues pin pointing these flash codes? Has anyone had these codes flash on thier 2003 Bonneville sle? Auto parts guy says its a loss evcm?
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Old 04-12-2014, 03:37 PM   #2
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Data issues between components and PCM. Have you done anything to the car recently?

Data issue is also caused by water/corrosion under back seat I think.
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Old 04-12-2014, 03:52 PM   #3
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Yes Mike thanks for response! I just had the ICM replaced and One coil pack that it fried. Also an intake gasket. Now its those two codes? what is PCM? Oh and a new battery!

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Old 04-12-2014, 03:55 PM   #4
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Your Powertrain Control Module.


Check under your back seat for any wires that are bolted to the body/chassis that might be corroded.
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Old 04-12-2014, 03:59 PM   #5
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Ok I will check that out! Thanks thats what the auto parts guy said also. Because it has been shifting a little hard in all gear....
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Old 04-12-2014, 05:30 PM   #6
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Hey Mike,
I checked the wiring harness under back seat and I found no corrosion at all? I checked all vacuum hoses and they seem to be all good? Would you have any other solutions in mind that I could check?
Thanks
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Old 04-12-2014, 05:46 PM   #7
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Someone else that'* 2000+ better than me should chime in soon.
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Old 04-12-2014, 06:39 PM   #8
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Well first, you need moi, a Tech II, to see if you can communicate with the EBCM and the PCM.....then you need to pull the harness to the EBCM, check the connections as previously suggested(may need to perform a "drag test").....then check that you have power and ground, and also a fluctuating voltage on the serial data line....can compare this fluctuating voltage to the serial data line in the ALDL....

ps.....I think I post more like a V-8, or at least a V-6.....

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Old 04-12-2014, 07:20 PM   #9
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Do a search in the 2000-2005 section for "data" and you'd be surprised at all the posts we have about that damn data issue.
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Old 04-13-2014, 10:33 AM   #10
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Thanks Tech II and Mike for your response'*! I will check it out when I can and will post when I get results...
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