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Trouble Codes p1571,p1644, p1602,p0441

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Just got a used Deville Concourse (always wanted) for the cheap. I have these codes I am trying to troubleshoot:





Also have Traction System, ABS, and Break lights on.

Also my backend swings over bumps.

I have been fixing a lot on it already using these forums, so I figured I'ed join and ask a few questions.

Please help get my land yacht :wub:

Thanks again for any info

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EBTCM to PCM data link issure for torque request. Disconnect the ebtcm connector and make sure its clean and dry to start.

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Back end swaying when going over bumps is most likely the rear knuckle bushings. Grab the rear tire at the 12:00 position and move it in and out - any movement indicates bad knuckle bushings. Dorman makes replacement parts.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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