Cadillac Catera 3.0L – DeVille 4.6L – Eldorado 4.6L – Escalade 5.3L – Escalade 5.7L – Escalade 6.0L – Escalade 6.0L – Escalade 6.2L – Seville 4.6L OBD1 Codes

Model	Year	Engine identification	System
Catera 3.0L	1997-01	VIN position 8 = R	GM
DeVille 4.6L	1996-05	VIN position 8 = Y/9	GM
Eldorado 4.6L	1996-02	VIN position 8 = Y/9	GM
Escalade 5.3L	2001-05	VIN position 8 = T/Z	GM
Escalade 5.7L	1999-00	VIN position 8 = R	GM
Escalade 6.0L	2001-06	VIN position 8 = N	GM
Escalade 6.0L	2009	VIN position 8 = 5	GM
Escalade 6.2L	2007-09	VIN position 8 = 2/8	GM
Seville 4.6L	1996-04	VIN position 8 = Y/9	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

1999 – 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).

1999 – Method 2

NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.

Ensure ignition switched OFF.
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.

2000 – • 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	–
P1031	Heated oxygen sensor (H02S) 1, banks 1 & 2 -heater current monitor control circuit	Wiring short circuit to positive, H02S, ECM
P1032	Heated oxygen sensor (H02S) 1, banks 1 & 2 -heater warm up control circuit	Wiring short circuit to positive, H02S, ECM
P1101	Intake air flow -incorrect	Wiring, mechanical fault, engine coolant temperature (ECT) sensor, exhaust gas recirculation (EGR) valve, 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 circuit intermittent -voltage high	Wiring open circuit/short circuit to ground/short circuit to positive
P1107	Manifold absolute pressure (MAP) sensor circuit intermittent -voltage low	Wiring short circuit to ground
P1108	Barometric pressure (BARO) sensor/manifold absolute pressure (MAP) sensor -comparison too high	Wiring open circuit/short circuit to positive, MAP sensor, ECM
P1111	Intake air temperature (IAT) sensor -circuitintermittent -voltage high	Wiring open circuit, ground lead defective
P1112	Intake air valve control valve -circuit malfunction	Wiring open circuit/short circuit to ground/positive, intake air valve control valve, ECM
P1112	Intake air temperature (IAT) sensor -circuit intermittent -voltage low	Wiring short circuit to ground
P1113	Intake air flap control actuator -circuit malfunction	Wiring open circuit/short circuit to ground/positive, intake air valve control valve, ECM
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, ground lead defective
P1120	Throttle motor position sensor 1 -circuit malfunction	Wiring open circuit/short circuit to ground/short circuit to positive, throttle control unit, ECM
P1121	Throttle position (TP) sensor -circuit malfunction -voltage high	Wiring short circuit to positive, ground lead defective
P1122	Throttle position (TP) sensor -circuit malfunction -voltage low	Wiring open circuit/short circuit to ground
P1125	Accelerator pedal position (APP) sensor 1/213signal malfunction	Wiring, APP sensor, ECM
P1133	Heated oxygen sensor (H02S) 1, bank 1insufficient switching	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1134	Heated oxygen sensor (H02S) 1, bank 1 slow response	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1139	Heated oxygen sensor (H02S) 2, bank 1insufficient switching	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1140	Heated oxygen sensor (H02S) 2, bank 1 slowresponse	Wiring, oxygen sensor heater, exhaust systemleaking, H02S
P1141	Heated oxygen sensor (H02S) 2, bank 1 heater control -circuit malfunction	Fuse, wiring, H02S, ECM
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 slowresponse	Wiring, oxygen sensor heater, exhaust system leaking, H02S
P1161	Heated oxygen sensor (H02S) 2, bank 2 heater control -circuit malfunction	Fuse, wiring, H02S, ECM
P1172	Fuel level sensors, primary & secondary sensor no fuel level change during fuel transfer from secondary to primary tank	Wiring, secondary fuel pump/relay, fuel level sensors
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) 2, bank 2 mixture variation between cylinders	Intake/exhaust leak/blockage, mechanical fault, ignition control, H02S
P1189	Engine oil pressure waming switch -circuit malfunction	Wiring open circuit, engine oil pressure warning switch, ECM
P1220	Throttle motor position sensor 2 -circuit malfunction	Wiring open circuit/short circuit to ground/short circuit to positive, throttle control unit, ECM
P1221	Throttle motor position sensor 1/2 -signal variation	Wiring, throttle control unit, ECM
P1255	Fuel pump control module -driver over-temperature	Fuel pump control module
P1258	Engine overheating	Cooling system, ECT sensor
P1271	Accelerator pedal position (APP) sensor 1/2signal variation	Wiring, APP sensor, ECM
P1275	Accelerator pedal position (APP) sensor 1 circuitmalfunction	Wiring open circuit/short circuit to ground/short circuit to positive, APP sensor, ECM
P1276	Accelerator pedal position (APP) sensor 1 rangeperformance	Wiring, APP sensor, ECM
P1280	Accelerator pedal position (APP) sensor 2 circuit malfunction	Wiring open circuit/short circuit to ground/short circuit to positive, APP sensor, ECM
P1281	Accelerator pedal position (APP) sensor 2 rangeperformance	Wiring, APP sensor, ECM
P1285	Accelerator pedal position (APP) sensor 3 circuitmalfunction	Wiring, APP sensor, ECM
P1286	Accelerator pedal position (APP) sensor 3 rangeperformance	Wiring, APP sensor, ECM
P1320	Ignition control module (ICM) -4X reference circuit, intermittent	Wiring open circuit/short circuit to ground, ICM, ECM
P1323	Ignition control module (ICM) -24X referencecircuit, low frequency	Wiring open circuit/short circuit to ground, ICM, ECM
P1336	Crankshaft position (CKP) sensor -variation not learned	Learning procedure not performed
P1345	Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -signal variation	CKP sensor, distributor/camshaft alignment, mechanical fault
P1350	Ignition control module (ICM) -bypass line monitor circuit malfunction	Wiring open circuit/short circuit to ground/short circuit to positive, ICM, ECM
P1351	Ignition control module (ICM) -ignition control (IC)circuit, voltage high	Wiring open circuit, ICM, ECM
P1359	Ignition control module (ICM) bank 1 -circuit malfunction	Wiring open circuit/short circuit to positive, ICM,ECM
P1360	Ignition control module (ICM) bank 2 -circuit malfunction	Wiring open circuit/short circuit to positive, ICM,ECM
P1361	Ignition control module (ICM) -ignition control (IC) circuit, voltage low	Wiring short circuit to ground, ICM, ECM
P1370	Ignition control module (ICM) -4X reference circuit, too many pulses	Wiring, electromagnetic interference, ICM
P1371	Ignition control module (ICM) -4X reference circuit, too few pulses	Wiring, electromagnetic interference, ICM
P1372	Crankshaft pOSition (CKP) sensor	Wiring open circuit/short circuit to ground/short circuit to positive, CKP, ECM
P1375	Ignition control module (ICM) -24X reference circuit, voltage high	Wiring open circuit/short circuit to ground/short circuit to positive, CKP sensor(s), ICM
P1376	Ignition control module (ICM) -ground circuit	Wiring open circuit/short circuit to pOSitive,ground lead defective, ICM
P1377	Ignition control module (ICM) cam pulse/4X reference pulse	Wiring open circuit/short circuit to ground, electromagnetic interference, valve timing
P1380	Rough road signal -signal error	ABS control module trouble code(s) stored
P1381	Rough road signal -no communication from antilock brake system (ABS) CAN data bus	Wiring open circuit, ABS system
P1400	Cold start emission control -malfunction	Intake/exhaust leak/blockage, mechanical fault, idle speed control (ISC) system, ignition control,engine coolant temperature (ECT) sensor, H02S
P1404	Exhaust gas recirculation (EGR) valve -stuck open	Wiring open circuit/short circuit to positive, EGR valve position sensor, EGR solenoid
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
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, AIR pump relay
P1441	Evaporative emission (EVAP) system -leak detected	Hose connection(s), EVAP canister, EVAP canister purge valve
P1460	Misfire -low fuel level	Fuel level low, misfire
P1483	Engine cooling system -performance	Cooling system, ECT sensor, IAT sensor
P1501	Immobilizer control module -circuit malfunction	Wiring open circuit/short circuit to ground/short circuit to positive, MIL circuit
P1502	Immobilizer control module -fuel enable signal	Wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM
P1503	Immobilizer control module -fuel enable signal	Incorrect ignition key, wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM
P1508	Idle air control (lAC) valve -low rpm	Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, throttle valve tight/sticking
P1509	Idle air control (lAC) valve -high rpm	Wiring open circuit/short circuit to ground/short circuit to positive, lAC valve, throttle valve tight/sticking
P1510	Throttle position motor -throttle limitation active	Wiring open circuit/short circuit to ground/short circuit to positive, throttle control unit, ECM
P1511	Throttle position motor -limp home system performance	Throttle valve tight/sticking, TP sensor, wiring, throttle control unit, ECM
P1514	Intake air flow -excessive flow	Throttle control unit, MAP sensor, CMP sensor signal, ECM
P1515	Throttle command/actual throttle position signal variation	Wiring, throttle valve sticking, throttle control unit, ECM
P1516	Throttle position motor -position performance	Throttle valve tight/sticking, TP sensor, wiring, throttle control unit, ECM
P1517	Throttle control module -malfunction	Throttle control module
P1518	Throttle control module/engine control module (ECM) -communication malfunction	Wiring, throttle control module, ECM
P1519	Throttle position motor -circuit malfunction	Wiring open circuit/short circuit to ground, throttle control unit, ECM
P1520	Park/neutral position (PNP) switch/transmission range (TR) switch	Wiring short circuit to ground, incorrectly adjusted, PNP switchlTR switch, ECM
P1523	Throttle position motor -closed position performance	Throttle valve tight/sticking, TP sensor, wiring open circuit/short circuit to ground, throttle control unit,ECM
P1524	Throttle pOSition (TP) sensor -leamed closed throttle angle	Accelerator cable adjustment, throttle valve tight/sticking, throttle valve incorrectly adjusted
P1526	Minimum throttle position not leamed	Initial learn procedure not carried out
P1527	Transmission range (TR) switch/transmission fluid pressure (TFP) switch -signal variation	Incorrectly adjusted TR switch, wiring open circuit/short circuit to ground, TR switch, TFP switch, ECM
P1530	Throttle position motor -circuit malfunction	Wiring open circuit/short circuit to ground, TP sensor, throttle control unit, ECM
P1545	AlC compressor clutch relay -circuit malfunction	Wiring open circuit/short circuit to ground, AlC compressor clutch relay, ECM
P1554	Cruise control status circuit -high voltage	Wiring open circuit/short circuit to ground, cruise control module, ECM
P1560	Cruise control -transmission not in drive	Driver error, TFP switch circuit
P1564	Battery voltage	Wiring
P1564	Cruise control -acceleration too high	Slippery road conditions
P1566	Cruise control -engine speed too high	Slippery road conditions, transmission mechanical fault
P1567	Cruise control -active brake control system active, cruise control disabled	Active brake control system engaged with cruise control on
P1570	Cruise control -traction control system (TCS) active, cruise control disabled	Slippery road surface
P1571	Traction control system (TCS), torque request circuit	Wiring open circuit/short circuit to groundl short circuit to positive, ABS control module trouble code(s) stored, ECM
P1574	Brake pedal position (BPP) switch -voltage high	Wiring, ABS
P1575	Brake pedal position (BPP) switch -extended travel contacts -voltage high	Wiring, ABS
P1576	Brake boost vacuum sensor voltage high	Wiring open circuit/short circuit to positive, ECM
P1577	Brake boost vacuum sensor -.voltage low	Wiring open circuit/short circuit to ground, ECM
P1578	Brake boost vacuum sensor -vacuum low	Wiring open circuit/short circuit to ground, vacuum leak, ECM
P1579	Transmission shifted from PIN to O/R at high throttle angle	Driver error, wiring, TR switch
P1585	Cruise control system -inhibit output circuit	Wiring open circuit/short circuit to ground/short circuit to positive, supply wire, cruise control motor/actuator, ECM
P1599	Engine stall or near stall detected	ECM trouble code(s) stored, mechanical fault,transmission mechanical fault
P1600	Engine control module (ECM) -memory reset	ECM
P1601	Engine control module (ECM) -temperature high	Module cooling fan, ECM
P1602	Engine control module (ECM) -knock sensor (KS) module	ECM
P1602	CAN data bus -antilock brake system (ABS)/ traction control system (TCS)	Wiring, ABS control module trouble code(s) stored
P1603	CAN data bus -sensing/diagnostic module (SOM)	Wiring
P1604	CAN data bus -instrument panel	Wiring, BCM trouble code(s) stored
P1605	CAN data bus –NC	Wiring, AlC system trouble code(s) stored
P1610	CAN data bus -body control module (BCM)	Wiring, BCM trouble code(s) stored
P1611	Suspension control module	Wiring open circuit/short circuit to ground/short circuit to positive, suspension control module,ECM
P1612	Instrumentation control module	Wiring open circuit/short circuit to ground/short circuit to positive, instrumentation control module,ECM
P1613	Dash integration module, data bus	Wiring open circuit/short circuit to ground/short circuit to positive, dash integration module, ECM
P1614	Rear integration module, data bus	Wiring open circuit/short circuit to ground/short circuit to positive, rear integration module, ECM
P1615	Immol;1i1izer control module, data bus	Wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module,ECM
P1617	Engine oil level switch -circuit malfunction	Wiring short circuit to ground, engine oil level, ECM
P1621	Engine control module (ECM) -memory performance .	ECM
P1624	Customer snapshot function operated	ECM trouble codes stored
P1626	Immobilizer control module	Wiring, BCM trouble code(s) stored
P1627	Engine control module (ECM) -memory performance	ECM
P1630	Engine control module (ECM), immobilizer code leaming mode	Immobilizer code not programmed
P1631	Engine control module (ECM) -incorrect immobilizer code	Incorrect key, immobilizer code not programmed
P1632	Engine control module (ECM), fuel disable signal	Fuses, BCM, immobilizer code
P1633	Engine control module (ECM), ignition supply voltage	Fuse, wiring open circuit, ECM
P1634	Engine control module (ECM) -ignition supply voltage -voltage low	Wiring open circuit, ECM
P1635	Sensor supply voltage -circuit A malfunction	Wiring s~ort circuit to ground/positive, ground wiring open circuit, EGR valve position sensor, MAP sensor, TP sensor, ECM
P1635	Sensor supply voltage -circuit A malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, EGR valve position sensor,MAP sensor, ECM
P1637	Altemator ‘l’ terminal -circuit malfunction	Wiring open circuit/short circuit to ground,alternator, battery temperature sensor, ECM
P1638	Alternator ‘F’ terminal -circuit malfunction	Wiring open circuit/short circuit to ground, alternator, ECM
P1639	Sensor supply voltage -circuit B malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, AlC pressure sensor (DeVille/Seville), FTP sensor, ECM
P1639	Sensor supply voltage -circuit B malfunction	Wiring short circuit to ground/positive, ground wiring open circuit, FTP sensor, TP sensor, ECM
P1640	Engine control module, output driver 1 -supply voltage high	Wiring, loose alternator connection, alternator
P1641	Malfunction indicator lamp (MIL) -circuit malfunction	Wiring open circuit/short circuit to ground, MIL, supply wire, ECM
P1642	Vehicle speed sensor (VSS) -circuit malfunction	Wiring open circuit/short circuit to groundlshort circuit to positive, VSS, ECM
P1644	Delivered torque -circuit malfunction	Wiring open circuit/short circuit to groundlshort circuit to positive, ABS trouble codes stored, ECM
P1645	Evaporative emission (EVAP) canister purge valve -circuit malfunction	Wiring open circuit/short circuit to ground, EVAP canister purge valve, ECM
P1646	Evaporative emission (EVAP) canister purge valve-circuit malfunction	Wiring open circuit/short circuit to ground, EVAP canister purge valve, ECM
P1650	Engine control module, output driver 2 -supply voltage high	Wiring, loose alternator connection, alternator
P1652	Suspension control module -engine control module (ECM), accelerationlbraking signal malfunction	Wiring open circuit/short circuit to groundlshort circuit to positive, suspension control module, ECM
P1654	Cruise control disable circuit -circuit malfunction	Wiring open circuit/short circuit to groundlshort circuit to positive, cruise control module, ECM
P1660	Engine coolant blower motor relay(s) -circuit malfunction	Wiring open circuit/short circuit to ground, engine coolant blower motor relay(s), ECM
P1662	Cruise control indicator lamp -circuit malfunction	Fuse, wiring, cruise control indicator lamp, ECM
P1680	Engine control module (ECM) -memory performance	ECM
P1681	Engine control module (ECM) -memory performance	ECM
P1682	Engine control module (ECM) -ignition power supply less than 10 V	Wiring, ECM
P1683	Engine control module (ECM) -memory performance	ECM
P1700	Transmission control module (TCM) -MIL request circuit malfunction	OBO II TCM trouble codes stored
P1701	Transmission control module (TCM) -MIL request circuit	Wiring open circuit/short circuit to groundlpositive, ECM
P1740	Transmission control module (TCM) -torque control circuit	Wiring open circuit/short circuit to groundlpositive,TCM, ECM
P1845	Torque limit management	Other trouble codes stored, ECM