Category: Buick

P1287 Buick Fuel Injection Pump Controller Supply Voltage Low Condition Possible causes – Fuel injection pump ground circuit open– Battery defective Symptoms – Engine Light ON (or Service Engine Soon Warning Light) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre –…

P1288 Buick Air Fuel Ratio Sensor 1 Circuit Slow Response Bank 2 Possible causes – Air fuel ratio (A/F) Harness or connectors is open or shorted– Air fuel ratio (A/F) sensor 1 Bank 2– Air fuel ratio (A/F) sensor 1 heater Bank 2– Fuel pressure– Fuel injector– Intake air leaks– Exhaust Gas leaks– PVC– Air…

P1289 Buick Air Fuel Ratio Sensor 1 Circuit Slow Response Bank 2 Possible causes – Air fuel ratio (A/F) Harness or connectors is open or shorted– Air fuel ratio (A/F) sensor 1 Bank 2– Air fuel ratio (A/F) sensor 1 heater Bank 2– Fuel pressure– Fuel injector– Intake air leaks– Exhaust Gas leaks– PVC– Air…

P1285 Buick Cylinder head over temp sensed Possible causes Low engine coolant level. Base engine concerns. Engine cooling system concerns. CHT sensor concern. Tech description On some applications when this fault occurs the Engine Temperature warning indicator will illuminate and/or force the temperature gauge to the full H (hot) zone. The warning indicator can be…

P1283 Buick Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 2 Possible causes – Faulty Air fuel ratio (A/F) sensor 1 Bank 2 – Faulty Air fuel ratio (A/F) sensor 1 heater Bank 2 – Fuel pressure– Faulty Fuel injector – Intake air leaks– Faulty Air Flow Meter Tech description If one or more…

P1284 Buick Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2 Possible causes – Faulty Air fuel ratio (A/F) sensor 1 Bank 1 – Faulty Air fuel ratio (A/F) sensor 1 heater Bank 1 – Fuel pressure– Faulty Fuel injector – Faulty Air Flow Meter Tech description What about the obd code? The A/F…

P1279 Buick Air Fuel Ratio Sensor 1 Circuit Slow Response Bank 1 Possible causes – Air fuel ratio (A/F) Harness or connectors is open or shorted– Air fuel ratio (A/F) sensor 1 Bank 1– Air fuel ratio (A/F) sensor 1 heater Bank 1– Fuel pressure– Fuel injector– Intake air leaks– Exhaust Gas leaks– PVC– Air…

P1280 Buick Accelerator Pedal Position (APP) Sensor 2 Circuit Technical Service Bulletins for P1280 Buick code Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave –…

P1281 Buick Air Fuel Ratio Sensor 1 Circuit No Activity Detected Bank 2 Possible causes – Faulty air fuel ratio (A/F) sensor 1 heater Bank 2 – Air fuel ratio (A/F) harness is open or shorted– Air fuel ratio (A/F) circuit poor electrical connection What about the obd code? The A/F signal computed by ECM…

P1282 Buick Air Fuel Ratio Sensor 1 Circuit No Activity Detected Bank 2 Possible causes – Faulty air fuel ratio (A/F) sensor 1 heater Bank 2 – Air fuel ratio (A/F) harness is open or shorted– Air fuel ratio (A/F) circuit poor electrical connection What about the obd code? The A/F signal computed by ECM…

P1275 Buick Cylinder #5 High To Low Side Open Possible causes Fuel injector No. 5 output circuit short to voltage. Injector. NG Module. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1275 Buick Description Indicates a high voltage condition exists at the injector output of the NG module for cylinder No. 5…

P1276 Buick Cylinder #6 High To Low Side Open Possible causes Harness or connectors (The A/F sensor 1 circuit is open or shorted.) Air fuel ratio (A/F) sensor 1 What about the obd code? The A/F signal computed by ECM from the A/F sensor 1 (Bank 1) signal is constantly approx. 1.5V. Symptoms – Engine…

P1277 Buick Cylinder #7 High To Low Side Open Possible causes Fuel injector No. 7 output circuit short to voltage. Injector. NG Module. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1277 Buick Description Indicates a high voltage condition exists at the injector output of the NG module for cylinder No. 7…

P1278 Buick Air Fuel Ratio Sensor 1 Circuit Slow Response Bank 1 Possible causes – Air fuel ratio (A/F) Harness or connectors is open or shorted– Air fuel ratio (A/F) sensor 1 Bank 1– Air fuel ratio (A/F) sensor 1 heater Bank 1– Fuel pressure– Fuel injector– Intake air leaks– Exhaust Gas leaks– PVC– Air…

P1271 Buick Cylinder #1 High To Low Side Open Possible causes Harness or connectors (The A/F sensor 1 circuit is open or shorted.) Air fuel ratio (A/F) sensor 1 What about the obd code? The A/F signal computed by ECM from the A/F sensor 1 (Bank 1) signal is constantly approx. 0V. Symptoms – Engine…

P1272 Buick Cylinder #2 High To Low Side Open Possible causes Harness or connectors (The A/F sensor 1 circuit is open or shorted.) Air fuel ratio (A/F) sensor 1 What about the obd code? The A/F signal computed by ECM from the A/F sensor 1 (Bank 1) signal is constantly approx. 5V. Symptoms – Engine…

P1273 Buick Cylinder #3 High To Low Side Open Possible causes – Shorted injector circuit – Faulty fuel injector – Faulty fuel injector interface module Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1273 Buick Description A fault is detected by the fuel injector interface module in the secondary (rearward) fuel injector…

P1274 Buick Cylinder #4 High To Low Side Open Possible causes Air fuel ratio (A/F) sensor 1 Air fuel ratio (A/F) sensor 1 heater Fuel pressure Fuel injector What about the obd code? The output voltage computed by ECM from the A/F sensor 1 (Bank 1) signal is shifted to the rich side for a…

P1269 Buick Immobilizer Code Not Programmed Symptoms – Engine Light ON (or Service Engine Soon Warning Light) Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave…

P1270 Buick Engine RPM Or Speed Limiter Reached Possible causes – Wheel slippage (water, ice, mud and snow)– Excessive engine RPM in neutral– Vehicle drive at a high rate of speed Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1270 Buick Description Engine RPM/Vehicle Speed Limiter Indicates the vehicle has been operated…