MANUFACTURER REFERENCE
GMC code references.
Read the source definition and confirm the exact vehicle, reporting module and diagnostic procedure.
GMC diagnostic guides
Find a guide by codeColorado and Canyon P0171 + P0174: inspect connections, then calibration
A paired-code case for 2020–2021 LGZ trucks, with a defined path if faults return.
Silverado and Sierra P0420/P0430: check the airbox before exhaust parts
Look for an intake sealing failure before authorizing catalyst or oxygen-sensor work.
Buick / Cadillac +6
P1031
HO2S Heater Current Monitor Control Circuit Sensors 1
PowertrainRead the code
Buick / Cadillac +6
P1032
HO2S Heater Warm Up Control Circuit Sensors 1
PowertrainRead the code
Buick / Cadillac +5
P1105
Secondary Vacuum Sensor Circuit
PowertrainRead the code
Buick / Cadillac +5
P1106
MAP Sensor Circuit Intermittent High Voltage
PowertrainRead the code
Buick / Cadillac +5
P1107
MAP Sensor Circuit Intermittent Low Voltage
PowertrainRead the code
Buick / Cadillac +5
P1108
BARO To MAP Sensor Circuit Comparison Too High
PowertrainRead the code
Buick / Cadillac +5
P1109
Secondary Port Throttle System
PowertrainRead the code
Buick / Cadillac +5
P1111
Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage
PowertrainRead the code
Buick / Cadillac +5
P1112
Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
PowertrainRead the code
Buick / Cadillac +5
P1113
Intake Resonance Switchover Valve Circuit
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Buick / Cadillac +4
P1114
Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage
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Buick / Cadillac +4
P1115
Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage
PowertrainRead the code
Buick / Cadillac +5
P1116
ECT Signal Unstable Or Intermittent
PowertrainRead the code
Buick / Cadillac +5
P1117
Engine Coolant Temp Signal Out-Of-Range Low
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Buick / Cadillac +5
P1118
Engine Coolant Temp Signal Out-Of Range High
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GMC / Oldsmobile
P1119
ECT Signal Out Of Range With TFT Sensor
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Buick / Cadillac +5
P1120
Throttle Position (TP) Sensor 1 Circuit
PowertrainRead the code
Buick / Cadillac +5
P1121
TP Sensor Circuit Intermittent High Voltage
PowertrainRead the code
Buick / Cadillac +5
P1122
TP Sensor Circuit Intermittent Low Voltage
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Buick / Cadillac +5
P1125
Accelerator Pedal Position (APP) System
PowertrainRead the code
Buick / Cadillac +5
P1130
HO2S Circuit Low Variance Bank 1 Sensor 1
PowertrainRead the code
Buick / Cadillac +5
P1131
HO2S Circuit Low Variance Bank 1 Sensor 2
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Buick / Cadillac +4
P1132
H02S Circuit Low Variance Bank 2 Sensor 1
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Buick / Cadillac +5
P1133
HO2S Insufficient Switching
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Buick / Cadillac +5
P1134
HO2S Transition Time Ratio
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Buick / Cadillac +5
P1135
HO2S Lean Average Bank 1 Sensor 1
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Buick / Cadillac +5
P1136
HO2S Rich Average Bank 1 Sensor 1
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Buick / Cadillac +5
P1137
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
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Buick / Cadillac +5
P1138
HO2S Bank 1 Sensor 2 Rich Or High Voltage
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Buick / Cadillac +5
P1139
HO2S Insufficient Switching Bank 1 Sensor 2
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Buick / Cadillac +5
P1140
HO2S Transition Time Ratio Bank 1 Sensor 2
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Buick / Cadillac +5
P1141
HO2S Bank 1 Sensor 2 Average Voltage Level
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Buick / Cadillac +5
P1143
HO2S Bank 1 Sensor 3 Lean Or Low Voltage
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Buick / Cadillac +5
P1144
HO2S Bank 1 Sensor 3 Rich Or High Voltage
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Buick / Cadillac +5
P1145
HO2S Cross Counts Bank 1 Sensor 3
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Buick / Cadillac +5
P1153
HO2S Insufficient Switching
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Buick / Cadillac +5
P1154
HO2S Transition Time Ratio
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Buick / Cadillac +5
P1155
HO2S Lean Average Bank 2 Sensor 1
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Buick / Cadillac +5
P1156
HO2S Rich Average Bank 2 Sensor 1
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Buick / Cadillac +5
P1157
HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
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Buick / Cadillac +5
P1158
HO2S Bank 2 Sensor 2 Rich Or High Voltage
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Buick / Cadillac +5
P1159
HO2S Cross Counts Bank 2 Sensor 2
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Buick / Cadillac +5
P1161
HO2S Heater Power Stage Circuit Bank 2 Sensor 2
PowertrainRead the code
Buick / Cadillac +5
P1163
HO2S Bank 2 Sensor 3 Lean System Or Low Voltage
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Buick / Cadillac +5
P1164
HO2S Bank 2 Sensor 3 Rich Or High Voltage
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Buick / Cadillac +5
P1165
HO2S Cross Counts Bank 2 Sensor 2
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Buick / Cadillac +5
P1170
Bank To Bank Fuel Trim Offset
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Buick / Cadillac +5
P1171
Fuel System Lean During Acceleration
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Buick / Cadillac +5
P1185
Engine Oil Temperature Circuit
PowertrainRead the code
Buick / Cadillac +5
P1186
EOT Circuit Performance
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Buick / Cadillac +5
P1187
EOT Sensor Circuit Low Voltage
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Buick / Cadillac +5
P1188
EOT Sensor Circuit High Voltage
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Buick / Cadillac +5
P1189
Engine Oil Pressure Switch Circuit
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Buick / Cadillac +5
P1190
Engine Vacuum Leak
PowertrainRead the code
Buick / Cadillac +5
P1191
Intake Air Duct Air Leak
PowertrainRead the code
Buick / Cadillac +5
P1200
Injector Control Circuit
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Buick / Cadillac +5
P1201
(Alternative Fuel) Gas Mass Sensor Circuit Range/Performance
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Buick / Cadillac +5
P1202
(Alternative Fuel) Gas Mass Sensor Circuit Low Frequency
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Buick / Cadillac +5
P1203
(Alternative Fuel) Gas Mass Sensor Circuit High Frequency
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Buick / Cadillac +5
P1211
Mass Air Flow Circuit Intermittent High
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Buick / Cadillac +5
P1212
Mass Air Flow Circuit Intermittent Low
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Buick / Cadillac +5
P1214
Injection Pump Timing Offset
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Buick / Cadillac +5
P1215
Ground Fault Detection Indicated
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Buick / Cadillac +5
P1216
Fuel Solenoid Response Time Too Short
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Buick / Cadillac +5
P1217
Fuel Solenoid Response Time Too Long
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Buick / Cadillac +5
P1218
Injection Pump Calibration Circuit
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Cadillac / Chevrolet +3
P1219
Throttle Position Sensor Reference Voltage
PowertrainRead the code
Buick / Cadillac +5
P1220
Throttle Position (TP) Sensor 2 Circuit
PowertrainRead the code
Buick / Cadillac +5
P1221
Throttle Position (TP) Sensor 1-2 Correlation
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Buick / Cadillac +5
P1222
Injector Control Circuit Intermittent
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Buick / Cadillac +5
P1225
Injector Circuit Cylinder 2 Intermittent
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Buick / Cadillac +5
P1228
Injector Circuit Cylinder 3 Intermittent
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Buick / Cadillac +5
P1231
Injector Circuit Cylinder 4 Intermittent
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Buick / Cadillac +5
P1234
Injector Circuit Cylinder 5 Intermittent
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Buick / Cadillac +5
P1237
Injector Circuit Cylinder 6 Intermittent
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Cadillac / Chevrolet +3
P1240
Injector Circuit Cylinder 7 Intermittent
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Buick / Cadillac +5
P1243
Injector Circuit Cylinder 8 Intermittent
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Buick / Cadillac +5
P1245
Intake Plenum Switchover Valve
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Buick / Cadillac +5
P1250
Early Fuel Evaporation Heater Circuit
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Buick / Cadillac +5
P1257
Supercharger System Overboost
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Buick / Cadillac +5
P1258
Engine Coolant Overtemperature Protection Mode Active
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Buick / Cadillac +5
P1260
Last Test Failed SCC Or Theft Detected Vehicle Immobilized
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Buick / Cadillac +5
P1270
Accelerator Pedal Position Sensor A/D Converter Error
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Buick / Cadillac +5
P1271
APP Sensor 1-2 Performance
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Buick / Cadillac +5
P1272
Accelerator Pedal Position Sensor 2
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Buick / Cadillac +5
P1273
Accelerator Pedal Position Sensor 1
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Buick / Cadillac +5
P1274
Injectors Wired Incorrectly
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Buick / Cadillac +5
P1275
Accelerator Pedal Position (APP) Sensor 1 Circuit
PowertrainRead the code
Buick / Cadillac +5
P1276
Accelerator Pedal Position (APP) Sensor 1 Performance
PowertrainRead the code
Buick / Cadillac +5
P1277
Accelerator Pedal Position Sensor 1 Circuit Low Voltage
PowertrainRead the code
Buick / Cadillac +5
P1278
Accelerator Pedal Position Sensor 1 Circuit High Voltage
PowertrainRead the code
Buick / Cadillac +5
P1280
Accelerator Pedal Position (APP) Sensor 2 Circuit
PowertrainRead the code
Buick / Cadillac +5
P1281
Accelerator Pedal Position (APP) Sensor 2 Performance
PowertrainRead the code
Buick / Cadillac +5
P1282
Accelerator Pedal Position Sensor 2 Circuit Low Voltage
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Buick / Cadillac +5
P1283
Accelerator Pedal Position Sensor 2 Circuit High Voltage
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Buick / Cadillac +5
P1285
Accelerator Pedal Position (APP) Sensor 3 Circuit
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Buick / Cadillac +5
P1286
Accelerator Pedal Position (APP) Sensor 3 Performance
PowertrainRead the code
Buick / Cadillac +5
P1287
Accelerator Pedal Position Sensor 3 Circuit Low Voltage
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Buick / Cadillac +5
P1288
Accelerator Pedal Position Sensor 3 Circuit High Voltage
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Buick / Cadillac +5
P1300
Ignitor Circuit
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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.
Model documentation
Only models identified by the cited manufacturer material are listed.