JJLee2009 Posted July 19, 2010 Report Share Posted July 19, 2010 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 Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 19, 2010 Report Share Posted July 19, 2010 You can get the meaning to the codes here. Post the descriptions here so the members can help http://myweb.accessu...90/dtcobd2.html 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 Link to comment Share on other sites More sharing options...
JJLee2009 Posted July 19, 2010 Author Report Share Posted July 19, 2010 You can get the meaning to the codes here. Post the descriptions here so the members can help http://myweb.accessu...90/dtcobd2.html Thank you. Updated my first post with what that website said. Still not sure what the problems are exactly though. Link to comment Share on other sites More sharing options...
Ranger Posted July 20, 2010 Report Share Posted July 20, 2010 I think the O2 sensor (P1134) is getting sluggish and thus causing P420. That O2 sensor is on the right bank (rear) exhaust manifold. Link to comment Share on other sites More sharing options...
JJLee2009 Posted September 6, 2010 Author Report Share Posted September 6, 2010 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. Link to comment Share on other sites More sharing options...
Ranger Posted September 7, 2010 Report Share Posted September 7, 2010 Your idle sounds normal. It is spec'd at 650 RPM. Link to comment Share on other sites More sharing options...
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