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My Diagnostic Trouble Codes


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IPC: U1000 - Class 2 Communication Malfunction, U1016, U1163 - Loss of Rear PASS Door Module SBI

PCM: P0420 - Catalyst System Low Efficiency, P1134 - Heated Oxygen Sensor (HO2S) Transition Time Ratio Bank 1 Sensor 1

RIM: C0658 - Level Control Compressor Circuit High, U1000 - Class 2 Communication Malfunction, U1163 - Loss of Rear PASS Door Module SBI

VCM: B3055 - Key not present

IPC -- Instrument Panel Cluster

PCM -- Powertrain Control Module

RIM -- Rear Integration Module

VCM -- ??

If anybody knows or could help me figure out what these mean it would be much appreciated.

And for the U1016 it lists 2 different things.

U1016 - Loss of Class 2 Communication with VCM

U1016 - Loss of Communications with PCM

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You can get the meaning to the codes here. Post the descriptions here so the members can help


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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  • 1 month later...

I think the O2 sensor (P1134) is getting sluggish and thus causing P420. That O2 sensor is on the right bank (rear) exhaust manifold.

Ok I will try replacing that and see if that helps. The car also seems to be idling a little bit low like around 600 rpms or so... maybe could be from the oxygen sensor.

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