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1997 ETC
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PCM P1611 - Loss of CVRTD serial data

TCS U1056 - Loss of communication with RSS


o_O?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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20,104 Posts
PCM P1611 - Loss of CVRTD serial data

TCS U1056 - Loss of communication with RSS


o_O?
---------------------
for the P1611 code -

DTC P0322 not set, key on for 10 seconds, then the PCM detected invalid or no Continuous Variable Real Time Damping serial data or that CVRTD serial data was received and lost for 11 seconds

have you tried clearing it - does it come right back?

U1056 - seems related -

did you get these after hitting a bump - or pot hole?

sounds like a loose connection somewhere -
 

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1997 Cadillac STS (BOSE w/AUX In, Massage Seats, URPAS, "Z")
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6,405 Posts
Sometimes these things happen especially in cold weather (due to voltage).
 
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