Buick OBD/OBD2 Codes >> Enclave 3.6L – LaCrosse 3.6/3.8/5.3L – Lucerne 3.8/3.9/4.6L – Rendezvous 3.6L – Terraza 3.5/3.9L

ModelYearEngine identificationSystem
Enclave 3.6L 2008-09VIN  position 8 = 7/VGM
LaCrosse 3.6/3.8/5.3L 2005-09VIN  position 8 =  2/4/7/CGM
Lucerne 3.8/3.9/4.6L 2006-09VIN  position 8 = 1/9/K/M/YGM
Rendezvous 3.6L 2004-06VIN  position 8 = 7GM
Terraza 3.5/3.9L 2005-07VIN  position 8 = 1/8/LGM

General information

  • Malfunction indicator lamp (MIL) will illuminate or flash if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.

Accessing

  • Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC):
  • Enciave/LaCrosse/Lucerne/Rendezvous
  • Terraza

Erasing

  • After the faults have been rectified, the manufacturer recommends that trouble codes are erased by using a Scan Tool connected to the data link connector (DLC).

Trouble code  identification 

Scan codeFault locationProbable cause
PO,P2,UORefer to OBO-II trouble code tables–
P1011Intake camshaft position (CMP) actuator, bank 1-incorrect park positionEngine oil level/pressure, mechanical fault
P1012Exhaust camshaft position (CMP) actuator, bank 1 -incorrect park positionEngine oil level/pressure, mechanical fault
P1013Intake camshaft position (CMP) actuator, bank 2 -incorrect park positionEngine oil level/pressure, mechanical fault
P101Exhaust camshaft position (CMP) actuator, bank 2 -incorrect park positionEngine oil level/pressure, mechanical fault
P1101Intake airflow -incorrectWiring, mechanical fault, engine coolant temperature (ECT) sensor, barometric pressure (BARO) sensor, intake air temperature (IAT) sensor, manifold absolute pressure (MAP) sensor,mass air flow (MAF) sensor, throttle position (TP) switch
P1106Manifold absolute pressure (MAP) sensor voltage high, intermittentWiring open circuit/short circuit to positive, poor connections
P1107Manifold absolute pressure (MAP) sensor voltagelow, intermittentWiring short circuit to ground, poor connections
P1111Intake air temperature (IAT) sensor -voltage high,intermittentWiring open circuit/short to positive, poor connections
P1112Intake air temperature (IAT) sensor -voltage low, intermittentWiring short circuit to ground
P1114Engine coolant temperature (ECT). sensorvoltage low, intermittentWiring short circuit to ground, poor connections
P1115Engine coolant temperature (ECT) sensorvoltage high, intermittentWiring open circuit/short to positive, poor connections
P1125Accelerator pedal position (APP) sensor 1/2 -signal malfunctionWiring, APP sensor, ECM
P1133Heated oxygen sensor (H02S) 1, bank 1insufficient switchingWiring, exhaust system leaking, H02S
P1134Heated oxygen sensor (H02S) 1, bank 1 slow responseWiring, oxygen sensor heater, exhaust system leaking, H02S
P1153Heated oxygen sensor (H02S) 1, bank 2insufficient switchingWiring, oxygen sensor heater, exhaust system leaking, H02S
P1174Heated oxygen sensor (H02S) 1, bank 1 mixture variation between cylindersIntake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1175Heated oxygen sensor (H02S) 1, bank 2 mixture variation between cylindersIntake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1350Ignition control system, bypass circuit -circuit malfunctionWiring, poor connections, ICM, ECM
P1380Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -malfunctionABS trouble code(s) stored
P1381Antilock brake system (ABS)/traction controlsystem (TCS), rough road signal to ECM nocommunicationWiring, poor connections, ABS
P1400Cold start emission control malfunctionIntake/exhaust leak/blockage, mechanical fault, idlespeed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1404Exhaust gas recirculation (EGR) valve -not fully closingWiring, poor connections, EGR valve position sensor, EGR solenoid
P1516Throttle command/actual throttle position -signal variationWiring, throttle valve sticking, throttle control module
P1551Throttle valve -rest position incorrectWiring, throttle body mechanical fault, throttle body, ECM
P1600Engine control module (ECM) -malfunctionEngine control module (ECM)
P1621Engine control module (ECM) memoryperformanceECM
P1627Engine control module (ECM) malfunctionEngine control module (ECM)
P1640Engine control module (ECM), quad driver/ output driver -circuit malfunctionWiring, ECM controlled components, ECM H
P1650Engine control module (ECM), quad driver/ outputdriver -circuit malfunctionWiring, ECM controlled components, ECM H
P1660Engine control module (ECM), quad driver/ output driver -circuit malfunctionWiring, ECM controlled components, ECM H
P1668Alternator ‘L’ terminal -circuit malfunctionWiring, voltage regulator, alternator, ECM
P167AECM -internal circuit malfunction, heated oxygen sensor (H02S) 1, bank 1ECM
P1680Engine control module (ECM) -malfunctionEngine control module (ECM)
P1681Engine control module (ECM) malfunctionEngine control module (ECM)
P1682Engine control (EC) relay/starter motor relay voltage correlation malfunctionWiring, fuse(s), EC relay, starter motor relay, ECM
P1683Engine control module (ECM) -malfunctionEngine control module (ECM)
P1811Shift time too long -adaptation limit reachedFluid level low, transmission mechanical fault
P1819Transmission range (TR) switch, signals ‘AIB/C &P’ -signal variationWiring, TR switch
P1820Transmission range (TR) switch, signal ‘A’ voltage lowWiring short to ground, TR switch
P1822Transmission range (TR) switch, signal ‘B’ voltage highWiring, TR switch
P1823Transmission range (TR) switch, signal ‘P’ voltage lowWiring short to ground, TR switch
P1825Transmission range (TR) switch, signals ‘AIB/C &P’ -incorrect signalWiring, TR switch
P1826Transmission range (TR) switch, signal ‘C’ voltage highWiring, TR switch
P1845Torque limit managementOther trouble codes stored, ECM
P1887Torque converter clutch (TCC) solenoid release switch -circuit malfunctionWiring open circuit, TCC solenoid release switch, ECMITCM
P1915Transmission range (TR) switch, signals ‘AlBIC &P’ -incorrect signal, while crankingWiring, TR switch
  The following actions may also set trouble codes:
  • Turning the engine OFF while the accelerator pedal is pressed.
  • Turning the engine OFF while driving.
  • Pressing the accelerator pedal to start the engine.
NOTE: Erase trouble code(s), road test vehicle and re-check fault memory. Depending on model , year and equipment level, the following components may be connected to this circuit. Use of the vehicle wiring diagram is recommended to confirm which components are fitted.
  1. A/C compressor clutch relay
  2. A/C condenser blower motor relay
  3. Engine coolant blower motor relay
  4. Engine coolant ‘hot’ warning lamp
  5. Evaporative emission (EVAP) canister purge valve
  6. Exhaust gas recirculation (EGR) solenoid
  7. Malfunction indicator lamp (MIL)
  8. Torque converter clutch (TCC) solenoid.
  9. Transmission shift solenoids (33)
  10. Transmission shift warning lamp (MT)