You might be surprised to learn that your Cadillac’s onboard computer is constantly monitoring its systems, waiting for the slightest hiccup to trigger a warning light on your dashboard. But what happens next is vital: the system stores a unique code that can help you identify the problem.
This code, known as a Diagnostic Trouble Code (DTC), holds the key to diagnosing and repairing the issue. But with thousands of possible codes, where do you even start?
Understanding Cadillac OBD-II Codes
One hundred and sixty-eight million Cadillac vehicles on the road today rely on the On-Board Diagnostics II (OBD-II) system to monitor and diagnose problems with their onboard systems.
As you drive, the OBD-II system continuously checks your vehicle’s engine, transmission, and emissions systems for potential issues. When a problem is detected, the system stores a Diagnostic Trouble Code (DTC) that identifies the specific issue.
You can retrieve these codes using a code reader or scan tool. Understanding Cadillac OBD-II codes is essential for quickly and accurately diagnosing problems, reducing downtime, and lowering repair costs.
Reading and Interpreting Trouble Codes
Your Cadillac’s onboard computer has stored a trouble code, and now it’s time to decipher its meaning.
To read and interpret trouble codes, you’ll need a scan tool or code reader. The code will be alphanumeric, consisting of a letter and numbers.
- Generic trouble codes (P0xxx) are standardized across all vehicle manufacturers.
- Manufacturer-specific codes (P1xxx) are unique to Cadillac and other GM vehicles.
- Body and chassis trouble codes (Bxxxx) relate to safety and comfort features in the vehicle.
- Network and communication trouble codes (Uxxxx) relate to issues with the vehicle’s onboard computer networks and communication systems.
You can find Cadillac OBD-II codes in the vehicle’s owner’s manual or online resources, and use them to diagnose and repair problems with your vehicle.
Manufacturer-Specific Code Lists
As you’ve deciphered the generic and standardized trouble codes, you’re now ready to explore into the manufacturer-specific codes unique to Cadillac vehicles.
Cadillac’s OBD2 trouble codes include codes that aren’t part of the standardized list, designated with a “U” or “B” prefix. These codes cover components specific to Cadillac, such as wheel speed sensors and steering wheel position sensors.
You can access these codes through the onboard diagnostics system, using specific procedures depending on your vehicle’s model and year.
The comprehensive list of Cadillac OBD2 codes is available online, providing valuable information to diagnose and fix problems with your vehicle’s systems and components, including the engine, transmission, and emissions systems.
Most Common Acura OBD-II Trouble Codes
| Code | Description |
|---|---|
| P1031 | HO2S Heater Current Monitor Control Circuit Sensors 1 |
| P1032 | HO2S Heater Warm Up Control Circuit Sensors 1 |
| P1105 | Secondary Vacuum Sensor Circuit |
| P1106 | MAP Sensor Circuit Intermittent High Voltage |
| P1107 | MAP Sensor Circuit Intermittent Low Voltage |
| P1108 | BARO To MAP Sensor Circuit Comparison Too High |
| P1109 | Secondary Port Throttle System |
| P1111 | Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage |
| P1112 | Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage |
| P1113 | Intake Resonance Switchover Valve Circuit |
| P1114 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage |
| P1115 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage |
| P1116 | ECT Signal Unstable Or Intermittent |
| P1117 | Engine Coolant Temp Signal Out-Of-Range Low |
| P1118 | Engine Coolant Temp Signal Out-Of Range High |
| P1119 | ECT Signal Out Of Rage With TFT Sensor |
| P1120 | Throttle Position (TP) Sensor 1 Circuit |
| P1121 | TP Sensor Circuit Intermittent High Voltage |
| P1122 | TP Sensor Circuit Intermittent Low Voltage |
| P1125 | Accelerator Pedal Position (APP) System |
| P1130 | HO2S Circuit Low Variance Bank 1 Sensor 1 |
| P1131 | HO2S Circuit Low Variance Bank 1 Sensor 2 |
| P1132 | H02S Circuit Low Variance Bank 2 Sensor 1 |
| P1133 | HO2S Insufficient Switching |
| P1134 | HO2S Transition Time Ratio |
| P1135 | HO2S Lean Average Bank 1 Sensor 1 |
| P1136 | HO2S Rich Average Bank 1 Sensor 1 |
| P1137 | HO2S Bank 1 Sensor 2Â Lean Or Low Voltage |
| P1138 | HO2S Bank 1 Sensor 2 Rich Or High Voltage |
| P1139 | HO2S Insufficient Switching Bank 1 Sensor 2 |
| P1140 | HO2S Transition Time Ratio Bank 1 Sensor 2 |
| P1141 | HO2S Bank 1 Sensor 2 Average Voltage Level |
| P1143 | HO2S Bank 1 Sensor 3 Lean Or Low Voltage |
| P1144 | HO2S Bank 1 Sensor 3 Rich Or High Voltage |
| P1145 | HO2S Cross Counts Bank 1 Sensor 3 |
| P1153 | HO2SÂ Insufficient Switching |
| P1154 | HO2S Transition Time Ratio |
| P1155 | HO2S Lean Average Bank 2 Sensor 1 |
| P1156 | HO2S Rich Average Bank 2 Sensor 1 |
| P1157 | HO2S Bank 2 Sensor 2 Lean System Or Low Voltage |
| P1158 | HO2S Bank 2 Sensor 2 Rich Or High Voltage |
| P1159 | HO2S Cross Counts Bank 2 Sensor 2 |
| P1161 | HO2S Heater Power Stage Circuit Bank 2 Sensor 2 |
| P1163 | HO2S Bank 2 Sensor 3 Lean System Or Low Voltage |
| P1164 | HO2S Bank 2 Sensor 3 Rich Or High Voltage |
| P1165 | HO2S Cross Counts Bank 2 Sensor 2 |
| P1170 | Bank To Bank Fuel Trim Offset |
| P1171 | Fuel System Lean During Acceleration |
| P1185 | Engine Oil Temperature Circuit |
| P1186 | EOT Circuit Performance |
| P1187 | EOT Sensor Circuit Low Voltage |
| P1188 | EOT Sensor Circuit High Voltage |
| P1189 | Engine Oil Pressure Switch Circuit |
| P1190 | Engine Vacuum Leak |
| P1191 | Intake Air Duct Air Leak |
| P1200 | Injector Control Circuit |
| P1211 | Mass Air Flow Circuit Intermittent High |
| P1212 | Mass Air Flow Circuit Intermittent Low |
| P1214 | Injection Pump Timing Offset |
| P1215 | Ground Fault Detection Indicated |
| P1216 | Fuel Solenoid Response Time Too Short |
| P1217 | Fuel Solenoid Response Time Too Long |
| P1218 | Injection Pump Calibration Circuit |
| P1219 | Throttle Position Sensor Reference Voltage |
| P1220 | Throttle Position (TP) Sensor 2 Circuit |
| P1221 | Throttle Position (TP) Sensor 1-Â 2 Correlation |
| P1222 | Injector Control Circuit Intermittent |
| P1225 | Injector Circuit Cylinder 2 Intermittent |
| P1228 | Injector Circuit Cylinder 3 Intermittent |
| P1231 | Injector Circuit Cylinder 4 Intermittent |
| P1234 | Injector Circuit Cylinder 5 Intermittent |
| P1237 | Injector Circuit Cylinder 6 Intermittent |
| P1240 | Injector Circuit Cylinder 7 Intermittent |
| P1243 | Injector Circuit Cylinder 8 Intermittent |
| P1245 | Intake Plenum Switchover Valve |
| P1250 | Early Fuel Evaporation Heater Circuit |
| P1257 | Supercharger System Overboost |
| P1258 | Engine Coolant Overtemperature – Protection Mode Active |
| P1260 | Last Test Failed SCC Or Theft Detected, Vehicle Immobilized |
| P1270 | Accelerator Pedal Position Sensor A/D Converter Error |
| P1271 | APP Sensor 1-2 Performance |
| P1272 | Accelerator Pedal Position Sensor 2 |
| P1273 | Accelerator Pedal Position Sensor 1 |
| P1274 | Injectors Wired Incorrectly |
| P1275 | Accelerator Pedal Position (APP) Sensor 1 Circuit |
| P1276 | Accelerator Pedal Position (APP) Sensor 1 Performance |
| P1277 | Accelerator Pedal Position Sensor 1 Circuit Low Voltage |
| P1278 | Accelerator Pedal Position Sensor 1 Circuit High Voltage |
| P1280 | Accelerator Pedal Position (APP) Sensor 2 Circuit |
| P1281 | Accelerator Pedal Position (APP) Sensor 2 Performance |
| P1282 | Accelerator Pedal Position Sensor 2 Circuit Low Voltage |
| P1283 | Accelerator Pedal Position Sensor 2 Circuit High Voltage |
| P1285 | Accelerator Pedal Position (APP) Sensor 3 Circuit |
| P1286 | Accelerator Pedal Position (APP) Sensor 3 Performance |
| P1287 | Accelerator Pedal Position Sensor 3 Circuit Low Voltage |
| P1288 | Accelerator Pedal Position Sensor 3 Circuit High Voltage |
| P1300 | Ignitor Circuit |
| P1305 | Ignition Coil 2 Primary Feedback Circuit |
| P1310 | Ignition Coil 3 Primary Feedback Circuit |
| P1315 | Ignition Coil 4 Primary Feedback Circuit |
| P1320 | IC Module 4X Ref Circuit Intermittent, No Pulses |
| P1321 | Electronic Ignition System Fault Line |
| P1322 | EI System Or Ignition Control Missing |
| P1323 | 24X Reference Circuit Low Frequency |
| P1324 | Crank RPM Too Low |
| P1335 | CKP Circuit |
| P1336 | Crankshaft Position (CKP) System Variation Not Learned |
| P1345 | CKP/CMP Correlation |
| P1346 | Intake Camshaft Position (CMP) Sensor System Performance |
| P1350 | Ignition Control System |
| P1351 | IC Circuit High Voltage |
| P1352 | IC Output High/Pulse Detected When Grounded Cyl.2 |
| P1353 | IC Output High/Pulse Detected When Grounded Cyl.3 |
| P1354 | IC Output High/Pulse Detected When Grounded Cyl.4 |
| P1355 | IC Output High/Pulse Detected When Grounded Cyl.5 |
| P1356 | IC Output High/Pulse Detected When Grounded Cyl.6 |
| P1358 | IC Output High/Pulse Detected When Grounded Cyl.7 |
| P1358 | IC Output High/Pulse Detected When Grounded Cyl.8 |
| P1359 | Ignition Control Circuit Group A |
| P1360 | Ignition Control Circuit Group B |
| P1361 | IC Circuit Low Voltage |
| P1362 | ICÂ Cylinder 2 Not Toggling After Enable |
| P1363 | IC Cylinder 3 Not Toggling After Enable |
| P1364 | IC Cylinder 4 Not Toggling After Enable |
| P1365 | IC Cylinder 5 Not Toggling After Enable |
| P1366 | IC Cylinder 6 Not Toggling After Enable |
| P1367 | IC Cylinder 7 Not Toggling After Enable |
| P1368 | IC Cylinder 8 Not Toggling After Enable |
| P1370 | IC Module 4X Reference Circuit, Too Many Pulses |
| P1371 | DI Low Resolution Circuit |
| P1372 | Crankshaft Position Sensor Circuit Performance |
| P1374 | 3X Reference Circuit |
| P1375 | 24X Reference Circuit High Voltage |
| P1376 | Ignition Ground Circuit |
| P1377 | IC Module CAM Pulse To 4X Reference Pulse Comparison |
| P1380 | Misfire Detected – Rough Road Data Not Available |
| P1381 | Misfire Detected – No Communication with Brake Control Module |
| P1390 | Wheel Speed Sensor 1, G-Sensor Circuit |
| P1391 | Wheel Speed Sensor 1, G-Sensor Circuit Performance |
| P1392 | Wheel Speed Sensor 1, G-Sensor Circuit Low Voltage |
| P1393 | Wheel Speed Sensor 1, G-Sensor Circuit High Voltage |
| P1394 | Wheel Speed Sensor 1, G-Sensor Circuit Intermittent |
| P1395 | Wheel Speed Sensor 2, G-Sensor Circuit |
| P1396 | Wheel Speed Sensor 2, G-Sensor Circuit Performance |
| P1397 | Wheel Speed Sensor 2, G-Sensor Circuit Low Voltage |
| P1397 | Wheel Speed Sensor 2, G-Sensor Circuit High Voltage |
| P1399 | Wheel Speed Sensor 2, G-Sensor Circuit Intermittent |
| P1403 | Exhaust Gas Recirculation System Valve 1 |
| P1404 | Exhaust Gas Recirculation System Valve 2 |
| P1405 | Exhaust Gas Recirculation System Valve 3 |
| P1406 | EGR Valve Pintle Position Circuit |
| P1407 | EGR Air Intrusion In Exhaust Supply To EGR Valve |
| P1408 | Intake Manifold Pressure Sensor Circuit |
| P1409 | EGR Vacuum System Leak |
| P1410 | Fuel Tank Pressure System |
| P1415 | Secondary Air Injection (AIR) System |
| P1416 | AIR System Bank 1 |
| P1418 | Secondary Air Injection System Relay A Control Circuit High |
| P1420 | Intake Air Low Pressure Switch Circuit Low Voltage |
| P1421 | Intake Air Low Pressure Switch Circuit High Voltage |
| P1423 | Intake Air High Pressure Switch Circuit High Voltage |
| P1431 | Fuel Level Sensor 2 Performance |
| P1432 | Fuel Level Sensor 2 Circuit Low Voltage |
| P1433 | Fuel Level |
