Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1996ELDORADO V8-4.6L VIN 9REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL MODULE HVACTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTA/C - FALSE CLASS 2 SERIAL DATA DTCS SET BY PROGRAMMER
1996 Cadillac Eldorado V8-4.6L VIN 9
A/C - False Class 2 Serial Data DTCs Set by Programmer
1996 Cadillac Eldorado V8-4.6L VIN 9SECTION A/C - False Class 2 Serial Data DTCs Set by Programmer
File In Section: 1 - HVAC
Bulletin No.: 63-12-11
Date: August, 1996
INFORMATION
Subject:
False Class 2 Serial Data Diagnostic Trouble Codes (DTCs) Set by the A/C Programmer
Models:
1996 Cadillac Concours, DeVille, Eldorado, Seville
Some of the above listed vehicles may experience the setting of false class 2 serial data Diagnostic Trouble Codes (DTCs) being set by the A/C programmer (ACM). A false class 2 serial data code is a four digit code that begins with the number 2. This can be any DTC other than 2016, 2064, 2096, 2153 and 2255.
These DTCs will not turn on the MIL lamp or display a message on the Driver Information Center (DIC). These false DTCs are discovered when the service technician enters on-board diagnostics and views ACM DTCs. The setting of these false codes will not affect any operation of the vehicle. The false DTC is cleared when the battery is momentarily disconnected. These DTCs will not return after the code has been cleared by a battery disconnect.
Bulletin No.: 63-12-11
Date: August, 1996
INFORMATION
Subject:
False Class 2 Serial Data Diagnostic Trouble Codes (DTCs) Set by the A/C Programmer
Models:
1996 Cadillac Concours, DeVille, Eldorado, Seville
Some of the above listed vehicles may experience the setting of false class 2 serial data Diagnostic Trouble Codes (DTCs) being set by the A/C programmer (ACM). A false class 2 serial data code is a four digit code that begins with the number 2. This can be any DTC other than 2016, 2064, 2096, 2153 and 2255.
These DTCs will not turn on the MIL lamp or display a message on the Driver Information Center (DIC). These false DTCs are discovered when the service technician enters on-board diagnostics and views ACM DTCs. The setting of these false codes will not affect any operation of the vehicle. The false DTC is cleared when the battery is momentarily disconnected. These DTCs will not return after the code has been cleared by a battery disconnect.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.