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Diagnostic Trouble Code Definitions

BCM DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC Description Go To
B110 Outside Temperature Sensor Circuit (1)
B111 A/C High Side Temperature Sensor Circuit (1)
B112 A/C Low Side Temperature Sensor Circuit (1)
B113 In-Car Temperature Sensor Circuit (1)
B115 Sunload Sensor Circuit (1)
B119 Twilight Photocell Circuit DTC B119 
B120 Twilight Delay Switch Pot Circuit DTC B120 
B120 & B122 Twilight Delay & Panel Dimming DTC B120 & B122 
B122 Panel Dimming Switch Pot Failure (4)
B124 Vehicle Speed Sensor Circuit Problem DTC B124 
B127 PRND321 Sensor (4)
B132 Oil Pressure Sensor Failure (4)
EO47, B334, B335, B336 Or B337 Serial Data Circuit Multiple Intermittent Data Codes DTC EO47, B334, B335, B336 Or B337 
B334 Loss Of ECM Data DTC B334 
B335 Loss Of Combo Panel Data DTC B335 
B336 Loss Of IPC Data DTC B336 
B337 Loss Of HVAC Programmer Data DTC B337 
B410 Charging System Circuit (3)
B411 Or B412 Battery Voltage Too Low Or Too High (3)
B420 BCM Output Driver No. 1 DTC B420 
B421 BCM Output Driver No. 2 DTC B421 
B440 Air Mix Valve (Door) Circuit Problem (1)
B441 Cooling Fans Problem (1)
B446, B447 Or B448 Refrigerant System Problem (1)
B449 HVAC - High Side Temperature To High (1)
B450 HVAC - Coolant Temperature To High (1)
B480 Anti-Lock Data Problem (2)
B481 Anti-Lock System Fault (2)DTC B481 
B552 Keep Alive Memory Error DTC B552 
B556 Odometer Error (BCM EEPROM) DTC B556 
(1) Perform appropriate test in AUTOMATIC A/C-HEATER SYSTEMS -- ALLANTE article.
(2) Perform appropriate test in ANTI-LOCK -- CADILLAC -- ALLANTE article.
(3) Perform appropriate test in GENERATORS & REGULATORS -- ALLANTE article in ELECTRICAL.
(4) Perform appropriate test in INSTRUMENT PANELS -- ALLANTE article.
LIGHTING DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC Description Go To
L010 Redundant Taillamp Relay L010 
L011 Redundant Headlamp Relay L011 
L110 LCP Communication Failure L110 
L202 OSM No. 2 Communication Failure L202 
L203 OSM No. 3 Communication Failure L203 
L204 OSM No. 4 Communication Failure L204 
L205 OSM No. 5 Communication Failure L205 
L206 OSM No. 6 Communication Failure L206 
L207 OSM No. 7 Communication Failure L207 
L208 OSM No. 13 Communication Failure L208 
L209 OSM No. 9 Communication Failure L209 
L210 OSM No. 10 Communication Failure L210 
L302 OSM No. 2 Output Failure ALL 300 "L" SERIES DTCS 
L303 OSM No. 3 Output Failure ALL 300 "L" SERIES DTCS 
L304 OSM No. 4 Output Failure ALL 300 "L" SERIES DTCS 
L305 OSM No. 5 Output Failure ALL 300 "L" SERIES DTCS 
L306 OSM No. 6 Output Failure ALL 300 "L" SERIES DTCS 
L307 OSM No. 7 Output Failure ALL 300 "L" SERIES DTCS 
L308 OSM No. 13 Output Failure ALL 300 "L" SERIES DTCS 
L309 OSM No. 9 Output Failure ALL 300 "L" SERIES DTCS 
L310 OSM No. 10 Output Failure ALL 300 "L" SERIES DTCS 
L411 Lighting System Low Voltage Warning L411 
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