Buick >> Riviera 3.8L – Roadmaster 5.7L – Skylark 2.4L – Skylark 3.1L

Model Year Engine identification System
Riviera 3.8L 1995-99 VIN  position 8 =  K/1 GM
Roadmaster S.7L 1996 VIN  position 8 =  P GM
Skylark 2.4L 1996-98 VIN  position 8 = T GM
Skylark 3.1 L 1996-98 VIN  position 8 = M 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).

Erasing

  • 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 (DLC).
  • Method 2

NOTE: Disconnecting battery ground lead may cause driveability 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.

Trouble code  identification

Scan code Fault location Probable cause
PO,P2,UO Refer to OBO-II trouble code tables
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) sensor circuit malfunction -voltage low Wiring short circuit to ground
P1115 Engine coolant temperature (ECT) sensor circuit 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 -circuit malfunction -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
P1133 Heated oxygen sensor (H02S) 1, bank insufficient switching Wiring open circuit/short circuit to ground, exhaust system leaking, oxygen sensor heater, oxygen sensor contamination, H02S
P1134 Heated oxygen sensor (H02S) 1 -slow response Wiring open circuit/short circuit to ground, exhaust system leaking, H02S
P1134 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring open circuit/short circuit to ground, exhaust system leaking, oxygen sensor heater, oxygen sensor contamination, H02S
P1153 Heated oxygen sensor (H02S) 1, bank 2-insufficient switching Wiring open circuit/short circuit to ground, exhaust system leaking, oxygen sensor heater, oxygen sensor contamination, H02S
P1154 Heated oxygen sensor (H02S) 1, bank 2 slow response Wiring open circuit/short circuit to ground, exhaust system leaking, oxygen sensor contamination,H02S
P1171 Fuel system -lean during acceleration Fuel filter, fuel lines, fuel pump
P1200 Injector(s) -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, ECM
P1222 Injector control -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, injector(s)
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 (IC) circuit -voltage high Wiring open circuit, ICM, ECM
P1352 Ignition control (IC) circuit -bypass line voltage high Wiring open circuit, ICM, ECM
P1361 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
P1362 Ignition control circuit, bypass line -voltage low Wiring short circuit to ground/short circuit to positive, ICM, ECM
P1371 Direct ignition (01) low resolution circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, distributor, 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 ASS control module trouble code(s) stored
P1381 Rough road signal -no communication from anti lock brake system (ABS) CAN data bus Wiring open circuit, ASS system
P1404 Exhaust gas recirculation (EGR) valve -stuck open Wiring open circuit/short circuit to positive, EGR valve, exhaust system blocked, ECM
P1406 Exhaust gas recirculation (EGR) valve position sensor circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, EGR valve position sensor, EGR valve, ECM
P1415 Secondary air injection (AIR) system -bank 1 Wiring, hoses blocked/leaking, AIR valve
P1416 Secondary air injection (AIR) system -bank 2 Wiring, hoses blocked/leaking, AIR valve
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
P1508 Idle air control (lAC) valve -rpm low Wiring open circuit/short circuit to ground/ short circuit to positive, IAC passages blocked, lAC valve
P1509 Idle air control (lAC) valve -rpm high Wiring open circuit/short circuit to ground/ short circuit to positive, IAC passages blocked, IAC valve
P1530 AlC refrigerant pressure sensor -circuit malfunction AlC refrigerant pressure, wiring open circuit/ shortcircuit to ground/short circuit to positive, AlCrefrigerant pressure sensor, ECM
P1539 AlC compressor clutch relay -voltage high Wiring open circuit/short circuit to ground/ short circuit to positive, AlC compressor clutch relay, ECM
P1545 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, AlC compressor clutch relay, ECM
P1546 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, AlC compressor clutch relay, 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 ground/ short circuit to positive, hoses leaking, cruise control servo, ECM
P1561 Cruise control vent solenoid Wiring open circuit/short circuit to ground/ short circuit to positive, cruise control servo, ECM
P1562 Cruise control vacuum solenoid Wiring open circuit/short circuit to ground/ short circuit to positive, cruise control servo, ECM
P1565 Cruise control servo position sensor -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, TCC solenoid, 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), torque requestcircuit Wiring open circuit/short circuit to ground/ short circuit to positive, ABS control module trouble code(s) stored, ECM
P1573 Data bus -anti lock brake system (ASS)! traction control system (TCS) Wiring, ABS control module trouble code(s) stored
P1585 Cruise control system -inhibit output circuit Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, cruise controlmotor/actuator, ECM
P1599 Cruise control -power management mode Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding
P1601 CAN data bus -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, ECM
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) -memory performance ECM
P1623 Engine control module (ECM) -PROM Insecure PROM, ECM
P1626 Immobilizer control module -fuel enable signal Incorrect ignition key, wiring open circuit/ short circuit to ground/short circuit to positive, immobilizer control module, 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
P1635 Sensor supply voltage -circuit A malfunction Wiring short circuit to positive, ground wiring open circuit, TP sensor, MAP sensor, EGR valve, ECM
P1639 Sensor supply voltage -circuit B malfunction 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 (1)
P1641 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, MIL, supply wire, ECM
P1641 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to positive, supply wire, AlC compressor relay, ignition main relay, ECM
P1641 Engine coolant blower motor relay 1 -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, engine coolant blower motor relay 1, ECM
P1642 Engine coolant blower motor relay 2 -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, engine coolant blower motor relay 2, ECM
P1643 Fuel pump control module -circuit malfunction Wiring open circuit/short circuit to ground/ shortcircuit to positive, fuel pump control module, ECM
P1643 Engine speed output circuit -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, ECM
P1645 Supercharger (SC) control valve solenoid circuitmalfunction Wiring open circuit/short circuit to ground/ short circuit to positive, SC control valve solenoid, ECM
P1646 Supercharger (SC) control valve solenoid -circuit 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, ECM (1)
P1651 Engine coolant blower motor relay 1 -circuitmalfunction Wiring open circuit/short circuit to ground/ 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 ground/ short circuit to positive, supply wire, engine coolant blower motor relay 2, ECM
P1652 . Vehicle speed output signal -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, ECM
P1653 Traction control system (TCS) -delivered torquecircuit Wiring open circuit/short circuit to ground/ short circuit to positive, ABS control module trouble code(s) stored, ECM
P1653 Engine oil level warning lamp -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, ECM
P1654 AlC compressor clutch relay -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, AlC compressor 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, EVAP canister purge valve, ECM
P1661 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, MIL lamp bulb, ECM
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
P1663 Engine oil level warning lamp -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, engine oil level lamp bulb, ECM
P1665 Evaporative emission (EVAP) canister vent valve-circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, EVAP canister vent valve, ECM
P1667 Fuel pump control module -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, fuel pump control module, ECM, fuel pump relay
P1670 Engine control module (ECM) quad driver! output driver Wiring, ECM controlled components, ECM EJ
P1671 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, ECM
P1672 Engine oil level warning lamp -circuit malfunction Wiring open circuit/short circuit to ground/ 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
P1675 Evaporative emission (EVAP) canister vent valve -circuit malfunction Wiring open circuit/short circuit to ground/ short to positive, EVAP canister vent valve, ECM
P1676 Evaporative emission (EVAP) canister purge valve -circuit malfunction Wiring open circuit/short circuit to ground/ . short circuit to positive, supply wire, EVAP canister purge valve, ECM
P1689 Traction control system (TCS) -delivered torque output circuit Wiring open circuit/short circuit to ground/ short circuit to positive, supply wire, ABS trouble codes stored, ECM
P1860 Torque converter clutch (TCC) solenoid circuit malfunction Wiring open circuit/short circuit to ground, TCC solenoid, ECM
U1016 Instrument panel, CAN data bus -communication malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, instrument panel, ECM
  1. Riviera 3.8L 1998 VIN 1
  2. Riviera 3.8L 1999 VIN 1
  3. Roadmaster 5.7L 1996 VIN P
  4. Skylark 3.1 L 1998 VIN M
  5. Except Roadmaster 5.7L 1996 VIN P
  6. Except Riviera 3.8L 1998 VIN 1, Skylark 3.1L 1998 VIN M & Roadmaster 5.7L 1996 VIN P
  7. Except Riviera 3.8L 1999 VIN 1 & Roadmaster 5.7L 1996 VIN P
  8. 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)