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I have a 1997 Cadillac deville. It has the service engine light on and I checked the DIC Every code I am going to list has "history " behind it. I can not figure out what these codes may mean. please help. The folowing codes are

PCM P0171

PCM P0174

PCM P0420

PCM P0603

PCM P0603

PCM P1599

IPC P1552

IPC B1983

IPC C1210

ACM B1315

ACM B1341

ACM B1983

SDM B1136

SDM B1147

SDM B1148

SDM B1161

SDM B1163

TCS C1222

TCS C1233

TCS C1255

PZM B1552

PZM B1558

PZM B1983

PZM B 2471

IRC B1740

IRC B 1771

IRC U 1225

IRC U1064

IRC U1065

RFF B2560

MMM U 1300

MMM B1983

MMM B2149

MMM B2150


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This post: http://caddyinfo.ipbhost.com/index.php?showtopic=2415 has all the DTC codes for 1998; although the codes do change sometimes these will give you a good reference for 1997.

Here are a few with text descriptions as an example:

DTC P0171 Fuel Trim System Lean Bank 1

DTC P0174 Fuel Trim System Lean Bank 2

DTC P0420 Catalyst System Low Efficiency

DTC P0603 Control Module Long Term Memory Reset

DTC P1599 Engine Stall or Near Stall Detected

but you can find the others in that post.


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As ranger noted, you need to find a vacuum leak that is affecting BOTH banks. Look for vacuum leaks, the overpressurization valve in the intake, brake booster vacuum leak.

But this could also be that the engine is being starved for fuel (causing a lean condition), check the fuel pressure idling and reving the engine

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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