Buick >> 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

Model Year Engine identification System
Enclave 3.6L  2008-09 VIN  position 8 = 7/V GM
LaCrosse 3.6/3.8/5.3L  2005-09 VIN  position 8 =  2/4/7/C GM
Lucerne 3.8/3.9/4.6L  2006-09 VIN  position 8 = 1/9/K/M/Y GM
Rendezvous 3.6L  2004-06 VIN  position 8 = 7 GM
Terraza 3.5/3.9L  2005-07 VIN  position 8 = 1/8/L GM

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.


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


  • 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 code Fault location Probable cause
PO,P2,UO Refer to OBO-II trouble code tables
P1011 Intake camshaft position (CMP) actuator, bank 1-incorrect park position Engine oil level/pressure, mechanical fault
P1012 Exhaust camshaft position (CMP) actuator, bank 1 -incorrect park position Engine oil level/pressure, mechanical fault
P1013 Intake camshaft position (CMP) actuator, bank 2 -incorrect park position Engine oil level/pressure, mechanical fault
P101 Exhaust camshaft position (CMP) actuator, bank 2 -incorrect park position Engine oil level/pressure, mechanical fault
P1101 Intake airflow -incorrect Wiring, 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
P1106 Manifold absolute pressure (MAP) sensor voltage high, intermittent Wiring open circuit/short circuit to positive, poor connections
P1107 Manifold absolute pressure (MAP) sensor voltagelow, intermittent Wiring short circuit to ground, poor connections
P1111 Intake air temperature (IAT) sensor -voltage high,intermittent Wiring open circuit/short to positive, poor connections
P1112 Intake air temperature (IAT) sensor -voltage low, intermittent Wiring short circuit to ground
P1114 Engine coolant temperature (ECT). sensorvoltage low, intermittent Wiring short circuit to ground, poor connections
P1115 Engine coolant temperature (ECT) sensorvoltage high, intermittent Wiring open circuit/short to positive, poor connections
P1125 Accelerator pedal position (APP) sensor 1/2 -signal malfunction Wiring, APP sensor, ECM
P1133 Heated oxygen sensor (H02S) 1, bank 1insufficient switching Wiring, exhaust system leaking, H02S
P1134 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1153 Heated oxygen sensor (H02S) 1, bank 2insufficient switching Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1174 Heated oxygen sensor (H02S) 1, bank 1 mixture variation between cylinders Intake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1175 Heated oxygen sensor (H02S) 1, bank 2 mixture variation between cylinders Intake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1350 Ignition control system, bypass circuit -circuit malfunction Wiring, poor connections, ICM, ECM
P1380 Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM -malfunction ABS trouble code(s) stored
P1381 Antilock brake system (ABS)/traction controlsystem (TCS), rough road signal to ECM nocommunication Wiring, poor connections, ABS
P1400 Cold start emission control malfunction Intake/exhaust leak/blockage, mechanical fault, idlespeed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1404 Exhaust gas recirculation (EGR) valve -not fully closing Wiring, poor connections, EGR valve position sensor, EGR solenoid
P1516 Throttle command/actual throttle position -signal variation Wiring, throttle valve sticking, throttle control module
P1551 Throttle valve -rest position incorrect Wiring, throttle body mechanical fault, throttle body, ECM
P1600 Engine control module (ECM) -malfunction Engine control module (ECM)
P1621 Engine control module (ECM) memoryperformance ECM
P1627 Engine control module (ECM) malfunction Engine control module (ECM)
P1640 Engine control module (ECM), quad driver/ output driver -circuit malfunction Wiring, ECM controlled components, ECM H
P1650 Engine control module (ECM), quad driver/ outputdriver -circuit malfunction Wiring, ECM controlled components, ECM H
P1660 Engine control module (ECM), quad driver/ output driver -circuit malfunction Wiring, ECM controlled components, ECM H
P1668 Alternator ‘L’ terminal -circuit malfunction Wiring, voltage regulator, alternator, ECM
P167A ECM -internal circuit malfunction, heated oxygen sensor (H02S) 1, bank 1 ECM
P1680 Engine control module (ECM) -malfunction Engine control module (ECM)
P1681 Engine control module (ECM) malfunction Engine control module (ECM)
P1682 Engine control (EC) relay/starter motor relay voltage correlation malfunction Wiring, fuse(s), EC relay, starter motor relay, ECM
P1683 Engine control module (ECM) -malfunction Engine control module (ECM)
P1811 Shift time too long -adaptation limit reached Fluid level low, transmission mechanical fault
P1819 Transmission range (TR) switch, signals ‘AIB/C &P’ -signal variation Wiring, TR switch
P1820 Transmission range (TR) switch, signal ‘A’ voltage low Wiring short to ground, TR switch
P1822 Transmission range (TR) switch, signal ‘B’ voltage high Wiring, TR switch
P1823 Transmission range (TR) switch, signal ‘P’ voltage low Wiring short to ground, TR switch
P1825 Transmission range (TR) switch, signals ‘AIB/C &P’ -incorrect signal Wiring, TR switch
P1826 Transmission range (TR) switch, signal ‘C’ voltage high Wiring, TR switch
P1845 Torque limit management Other trouble codes stored, ECM
P1887 Torque converter clutch (TCC) solenoid release switch -circuit malfunction Wiring open circuit, TCC solenoid release switch, ECMITCM
P1915 Transmission range (TR) switch, signals ‘AlBIC &P’ -incorrect signal, while cranking Wiring, 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)