Buick >> Century 2.2L • Century 3.1 L • LeSabre 3.8L • Park Avenue 3.8L Rainier 4.2/5.3L • Regal 3.1L • Regal 3.8L • Rendezvous 3.4/3.5L

 
Model Year Engine identification System
Century 2.2L 1996 VIN Position 8=4 GM
Century 3.1L 1994-05 VIN Position 8=M/J GM
LeSabre 3.8L 1994-05 VIN Position 8=L/K GM
Park Avenue 3.8L 1994-05 VIN Position 8=L/K/1 GM
Rainier 4.2L 2004-07 VIN Position 8=S GM
Rainier 5.3L 2004-07 VIN Position 8=M/P GM
Regal 3.1L 1996-97 VIN Position 8=M GM
Regal 3.8L 1994-04 VIN Position 8=L/K/1 GM
Rendezvous 3.4L 2002-05 VIN Position 8=E GM
Rendezvous 3.5L 2006-07 VIN Position 8=8 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.

Accessing

  • Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC).
  • 12 pin connector :
    • Century -1995.
    • Regal -1995.
  • 16 pin connector f) :
    • Century 1996 -.
    • LeSabre.
    • Park Avenue.
    • Rainier.
    • Regal 1996-.
    • Rendezvous

Erasing

-+ 2000 -method 1 • 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 (OLC). -+2000 -method 2 NOTE: Disconnecting battery ground lead may cause driveabi/ity problems until the engine management system relearns basic values.
  • Ensure ignition switched OFF for at least 10 seconds.
  • Disconnect battery ground cable for at least 30 seconds.
  • Reconnect battery ground cable.
  • Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.
NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio. 2001 -+ • 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).
Scan code Fault I.ocation Probable cause
PO, P2, UO Refer to OBD-II trouble code tables
P1101 Intake air flow -incorrect Wiring, mechanical fault, engine coolant temperature (EeT) sensor, barometric pressure (BARO) sensor, intake air temperature (IAT) sensor, manifoldabsolute pressure (MAP) sensor, mass air flow (MAF) sensor, throttle position (TP)switch
P1106 Manifold absolute pressure (MAP) sensor circuit intermittent -voltage high Wiring open circuit/short circuit to positive
P1107 Manifold absolute pressure (MAP) sensor circuit intermittent -voltage low Wiring open circuit/short circuit to ground
P1111 Intake air temperature (IAT) sensor -circuit intermittent -voltage high Wiring open circuit/short circuit to positive, ground lead defective
P1112 Intake air temperature (IAT) sensor -circuit intermittent -voltage low Wiring short circuit to ground
P1114 Engine coolant temperature (ECT) sensorcircuit malfunction -voltage low Wiring short circuit to ground
P1115 Engine coolant temperature (ECT) sensorcircuit malfunction -voltage high Wiring open circuit/short circuit to positive, ground lead defective
P1121 Throttle position (TP) sensor -circuit malfunction -voltage high Wiring open circuit/short circuit to positive, ground lead defective
P1122 Throttle pOSition (TP) sensor -circuitmalfunction -voltage low Wiring open circuit/short circuit to ground
P1133 Heated oxygen sensor (H02S) 1 -insufficient switching Wiring open circuit/short circuit to ground, exhaust system leaking, H02S
P1134 Heated oxygen sensor (H02S) 1 -slowresponse Wiring open circuit/short circuit to ground, exhaust system leaking, H02S
P1137 Heated oxygen sensor (H02S) 2 -signal below threshold (lean) Wiring open circuit/short circuit to ground, exhaust system leaking, H02S
P1138 Heated oxygen sensor (H02S) 2 -signal above threshold (rich) Wiring open circuit/short circuit to ground, exhaust system leaking, H02S
P1153 Heated oxygen sensor (H02S) 1, bank 2 insufficient switching Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1154 Heated oxygen sensor (H02S) 1, bank 2 slow response Wiring, oxygen sensor heater, exhaustsystem leaking, H02S
P1171 Fuel system -lean during acceleration Fuel filter, fuel pump, H02S, injectors
P1189 Engine oil pressure warning lamp switchcircuit malfunction Wiring, engine oil pressure warning lampswitch, ECM
P1200 Injector(s) -circuit malfunction Wiring open circuit/short circuit to ground! short circuit to positive, ECM
P1257 Boost control problem Wiring short circuit to ground, hoses blocked/leaking, boost bypass actuator, boost control solenoid, ECM
P1260 Fuel pump speed relay -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, fuel pump relay, fuel pump control module, ECM
P1336 Crankshaft position (CKP) sensor -variation not learned Learning procedure not performed
P1350 Ignition control module (ICM) -electronic spark timing (EST)/ignition control (IC)/bypass circuit malfunction Wiring open circuit/short circuit to ground!short circuit to positive, ICM, ECM
P1351 Ignition control module, ignition control (I C) circuit -voltage high Wiring open circuit, ICM, ECM
P1352 Ignition control circuit -bypass line -voltage high Wiring open circuit, ICM, ECM
P1361 Ignition control module (ICM) -electronicspark timing (EST)/ignition control (IC)/bypass circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, ICM, ECM
P1362 Ignition control circuit, bypass line -voltage low Wiring short circuit to ground/short circuit to positive, ICM, ECM
P1374 Crankshaft position (CKP) Wiring open circuit/short circuit to ground! short circuit to positive, wiring routed near spark plug wires, ignition coils arcing! tracking, ICM, ECM
P1380 Rough road signal -signal error ABS control module trouble code(s) stored
P1381 Rough road signal -no communication from antilock brake system (ASS) CANdata bus Wiring open circuit, ABS system
P1400 Cold start emission control -malfunction Intake/exhaust leak/blockage, mechanicalfault, idle speed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H02S
P1403 Exhaust gas recirculation (EGR) valvesolenoid 1 Wiring open circuit/short circuit to ground,exhaust system blocked, EGR valve, ECM
P1404 0 Exhaust gas recirculation (EGR) valvesolenoid 2 Wiring open circuit/short circuit to ground,exhaust system blocked, EGR valve, ECM
P1404 f) D9 Exhaust gas recirculation (EGR) valve -stuck open Wiring open circuit/short circuit to positive, EGR valve, exhaust system blocked, ECM
P1405 Exhaust gas recirculation (EGR) valve solenoid 3 Wiring open circuit/short circuit to ground, exhaust system blocked, EGR valve, ECM
P1406 Exhaust gas recirculation (EGR) valve position sensor circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, EGR valve, ECM
P1441 Evaporative emission (EVAP) system -leak detected Wiring short circuit to ground, hose connection(s), EVAP system vacuum switch, EVAP canister purge valve, ECM
P1442 Evaporative emission (EVAP) system vacuum switch -circuit malfunction Wiring open circuit/short circuit to ground, EVAP system vacuum switch, ECM
P1483 Engine cooling system -performance Cooling system, engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor
P1516 Throttle actuator control position -variation between requested and actual throttle position Wiring open circuit/short circuit, throttle control, ECM
P1520 Park/neutral position (PNP) switch Wiring short circuit to ground, incorrectly adjusted, ECM
P1530 AlC refrigerant pressure sensor -circuit malfunction AlC refrigerant pressure, wiring open circuit/ short circuit to ground/short circuit to positive, AlC refrigerant pressure sensor, ECM
P1531 Low AlC refrigerant charge Low AlC refrigerant charge, wiring opencircuit/short circuit to ground/short circuit to positive, AlC refrigerant low pressure switch, ECM
P1546 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, AlC compressor clutch relay, ECM
P1550 Cruise control stepper motor, circuit malfunction Wiring open circuit/short circuit to positive,cruise control module, ECM
P1554 Cruise control status circuit Wiring short circuit to ground, cruise control module, ECM
P1558 Cruise control servo position sensor -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, hoses leaking, cruise control servo, ECM
P1561 Cruise control vent solenoid Wiring open circuit/short circuit to groundl short circuit to positive, cruise control servo, ECM
P1562 Cruise control vacuum solenoid Wiring open circuit/short circuit to groundlshort circuit to positive, cruise control servo, ECM
P1565 Cruise control servo position sensor -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, cruise control servo, ECM
P1567 Cruise control switch -circuit malfunction Wiring open circuit/short circuit to positive, cruise control switch, brake pedal vacuum valve, ECM
P1568 Cruise control servo -servo position sensor high Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding
P1571 Traction control system (TCS), torquerequest circuit Wiring open circuit/short circuit to groundlshort circuit to positive, ABS control module trouble code(s) stored, ECM
P1573 Data bus -anti lock brake system (ABS)/ traction control system (TCS) Wiring, ABS control module trouble code(s) stored
P1575 Brake pedal position (BPP) switch -extended travel Wiring short circuit to positive, BPP switch, ECM
P1585 Cruise control system -inhibit output circuit Wiring open circuit/short circuit to groundlshort circuit to positive, supply wire, cruise control motor/actuator, ECM
P1599 Cruise control -power management mode Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding
P1600 Engine control module (ECM) -programming/ memory ECM
P1602 CAN data bus -antilock brake system (ABS)/ traction control system (TCS) Wiring, ABS control module trouble code(s) stored
P1604 CAN data bus Wiring, BCM trouble code(s) stored
P1605 CAN data bus -AlC Wiring, AlC system trouble code(s) stored
P1610 CAN data bus -body control module (BCM) Wiring, BCM trouble code(s) stored
P1619 Engine oil life monitor reset switch -circuit malfunction Wiring short circuit to ground, engine oil life monitor reset switch, ECM
P1621 Engine control module (ECM) -programmingl memory ECM
P1623 Engine control module (ECM) -PROM Insecure PROM, ECM
P1626 Data bus, immobilizer Wiring, BCM trouble code(s) stored
P1626 Immobilizer control module -fuel enablesignal Incorrect ignition key, wiring open circuit!short circuit to ground/short circuit to positive, immobilizer control module, ECM
P1627 Engine control module (ECM) -programming! memory ECM
P1629 Immobilizer control module -fuel enable signal Incorrect ignition key, wiring open circuit/ short circuit to ground/short circuit to positive, immobilizer control module, ECM
P1630 Battery voltage too highllow Wiring, alternator, ECM
P1630 Engine control module (ECM), immobilizercode learning mode Immobilizer code not programmed
P1631 Engine control module (ECM) -incorrect immobilizer code Incorrect key, immobilizer code not programmed
P1633 Engine control module (ECM), ignition supply voltage Fuse, ECM
P1634 Engine control module (ECM), ignition supply voltage Fuse, wiring, ECM
P1635 Sensor supply voltage -circuit A malfunction Wiring, TP sensor, MAP sensor, EGR valve, ECM
P1637 Alternator ‘L’ terminal, circuit malfunction Wiring, alternator, ECM
P1639 Sensor supply voltage -circuit Bmalfunction Wiring short circuit to ground/positive, ground wiring open circuit, AlC refrigerant pressure sensor, ECM
P1640 Engine control module (ECM) quad driver! output driver Wiring, ECM controlled components, ECM ~
P1641 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, MIL, supply wire, ECM
P1641/td> AlC compressor clutch relay -circuitmalfunction Wiring open circuit!short circuit to positive, supply wire, AlC compressor relay, ignition main relay, ECM
P1643 Fuel pump control module -circuitmalfunction Wiring open circuit!short circuit to ground/ short circuit to positive, fuel pump control module, ECM
P1644 Traction control system (TCS) -delivered torque signal out of range Wiring open circuit/short circuit to groundl short circuit to positive, ECM
P1645 Supercharger (SC) control valve solenoid -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, SC control valve solenoid, ECM
P1646 Supercharger (SC) control valve solenoidcircuit malfunction Wiring open circuit/short circuit to ground! short circuit to positive, SC control valve solenoid, ECM
P1650 Engine control module, quad driver/output driver Wiring, ECM controlled components, ECMiI!l
P1651 Engine coolant blower motor relay 1 -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, engine coolant blower motor relay 1, ECM
P1652 Engine coolant blower motor relay 2 -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, engine coolant blower motor relay 2, ECM
P1653 Traction control system (TCS) -delivered torque circuit Wiring open circuit/short circuit to ground!short circuit to positive, ABS control module trouble code(s) stored, ECM
P1654 NC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to groundlshort circuit to positive, supply wire, AlCcompressor clutch relay, ECM
P1655 Evaporative emission (EVAP) canister purge valve -circuit malfunction Wiring open circuit/short circuit to ground! short circuit to positive, supply wire, EVAPcanister purge valve, ECM
P1660 Engine control module (ECM) quad driver/output driver Wiring, ECM controlled components, ECMiI!l
P1662 Cruise control inhibit circuit -circuit malfunction Wiring open circuit/short circuit to ground,cruise control motor/actuator, cruise control module, ECM
P1663 Alternator warning lamp -circuit malfunction Wiring open circuit/short circuit to ground! short circuit to positive, supply wire, instrument panel, ECM
P1665 Evaporative emission (EVAP) canister vent valve -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, EVAPcanister vent valve, ECM
P1667 Fuel pump control module -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, fuel pump control module, ECM, fuel pump relay
P1668 Altemator ‘L’ terminal -circuit malfunction Wiring, voltage regulator, alternator, ECM
P1670 Engine control module (ECM) quad driver! output driver Wiring, ECM controlled components, ECMiI!l
P1671 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, ECM
P1672 Engine oil level warning lamp -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, supply wire, ECM
P1673 Engine coolant ‘hot’ warning lamp -circuit malfunction Wiring open circuit/short circuit to ground, cooling system, ECM
P1674 Tachometer -circuit malfunction Wiring open circuit/short circuit to ground! short circuit to positive, instrument panel,ECM
P1675 Evaporative emission (EVAP) canister ventvalve -circuit malfunction Wiring open circuit/short circuit to ground, EVAP canister vent valve, ECM
P1676 Evaporative emission (EVAP) canister purge valve -circuit malfunction Wiring open circuit/short circuit to groundlshort circuit to positive, supply wire, EVAP canister purge valve, ECM
P1680 Engine control module (ECM) -programmingl memory ECM
P1681 Engine control module (ECM) -programming/ memory ECM
P1682 Engine control module (ECM) -ignitionpower supply less than 10 V Wiring, ECM
P1683 Engine control module (ECM) -programmingl memory ECM
P1689 Traction control system (TCS) -deliveredtorque ‘ output circuit Wiring open circuit/short circuit to groundlshort circuit to positive, supply wire, ABS trouble codes stored, ECM
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.
  • A/C compressor clutch relay
  • A/C condenser blower motor relay
  • Engine coolant blower motor relay
  • Engine coolant ‘hot’ warning lamp
  • Evaporative emission (EVAP) canister purge valve
  • Exhaust gas recirculation (EGR) solenoid
  • Malfunction indicator lamp (MIL)
  • Torque converter clutch (TCC) solenoid
  • Transmission shift solenoids (SS)
  • Transmission shift warning lamp (MT)