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 MANUALSCADILLAC1991SEVILLE V8-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWOTHER BCM CODE GENERATED MESSAGES
1991 Cadillac Seville V8-300 4.9L
Other BCM Code Generated Messages
1991 Cadillac Seville V8-300 4.9LSECTION Other BCM Code Generated Messages
The following messages are generated because of a BCM code being set and should be diagnosed using the appropriate code.
A/C Sensor Fault B110, B112, B113, or B115
Gear Select Problem B127
System Problem B334, B336, or B337
Batt Volts Low B411
Batt Volts High B412
Battery No Charge telltale B410
Low A/C Refrigerant - Service A/C Soon B446
Low A/C Refrigerant - A/C Compressor Off B447 or B448
A/C Overheated - A/C Compressor Off B449
Engine Hot - A/C Compressor Off* B450
Starting Disabled - Due to Theft System - Remove ignition key. Wait 3 Minutes, wait 2 minutes, wait 1 minute. Start Car. Theft system problem car may not restart.
*Note: Codes B441 and B450 also illuminate the "Coolant Temp/Fan" telltale.
RENDER: 1.0x
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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.