Jeep >> Cherokee 2.5/4.0L – Compass 2.4L – Grand Cherokee – Liberty – Patriot – Wrangler

Model Year Engine identification System
Cherokee 2.5L 1999-02 VIN  position 8 = P JTEC/NGC 3
Cherokee 4.0L 1999-02 VIN  position 8 = S JTEC/NGC 3
Compass 2.4L 2007-08 VIN  position 8 =  W JTEC/NGC 3
Grand Cherokee 3.0/3.7/4.7/S.7/6.1L 1999-09 VIN  position 8  =  M/2/3/K/N/P JTEC/NGC 3
Grand Cherokee 4.0L 1999-04 VIN  position 8 =  S JTEC/NGC 3
Liberty 2.4L 2002-05 VIN  position 8 = 1 JTEC/NGC 3
Liberty 2.8L 2005-06 VIN  position 8 = 5 JTEC/NGC 3
Liberty 3.7L 2002-08 VIN  position 8 = K JTEC/NGC 3
Patriot 2.4L 2007-08 VIN  position 8 =  W JTEC/NGC 3
Wrangler 2.4L 2003-06 VIN  position 8 = 1 JTEC/NGC 3
Wrangler 2.5L 1999-02 VIN  position 8 = P JTEC/NGC 3
Wrangler 3.8L 2007-08 VIN  position 8 = 1 JTEC/NGC 3
Wrangler 4.0l 1999-06 VIN  position 8 =  S JTEC/NGC 3

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 (OLC):
  1. Cherokee/Wrangler 1
  2. Grand Cherokee/Liberty 2

Erasing

• Trouble codes can only be 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 OBD-II trouble code tables
P1110 Decreased engine performance -high intake air temperature Wiring open circuit/short to positive, ground wire defective, IAT sensor, ECT sensor, cooling system, high engine bay temperature, ECM
P1115 Engine coolant temperature (ECT) sensor/intake air temperature (IAT) sensor-signal variation Wiring, ECT sensor, IAT sensor, ECM
P1128 Closed loop fuel control not achieved -bank 1 Wiring, H02S, fuel system, MAP sensor, ECM
P1129 Closed loop fuel control not achieved -bank 2 Wiring, H02S, fuel system, MAP sensor, ECM
P1192 Intake air temperature (IAT) sensor -voltage low Wiring, IAT sensor, ECM
P1193 Intake air temperature (IAT) sensor -voltage high Wiring, IAT sensor, ECM
P1194 Heated oxygen sensor (H02S), heater control -circuit malfunction Wiring, H02S, ECM
P1195 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring, heating inoperative, exhaust leak, H02S
P1196 Heated oxygen sensor (H02S) 1, bank 2 slow response Wiring, heating inoperative, exhaust leak, H02S
P1197 Heated oxygen sensor (H02S) 2, bank 1 slow response Wiring, heating inoperative, exhaust leak, H02S
P1270 Intake manifold air control -performance Wiring, intake manifold air control actuator, ECM
P1273 AlC compressor clutch control circuit 2 (PCM) circuit high Wiring, AlC compressor clutch, PCM
P1275 AlC compressor clutch control circuit 2 (PCM) over-current Wiring, AlC compressor clutch, poor connection, PCM
P1277 Starter control circuit 2 (PCM) -short circuit to ground Wiring, starter motor, PCM
P127A Starter control circuit 2 (PCM) over-current Wiring, poor connection, starter motor, PCM
P127C Fuel pump control circuit 2 (PCM) -short circuit to ground Wiring, fuel pump, PCM
P127D Fuel pump control circuit 2 (PCM) -short circuit topower Wiring, fuel pump, PCM
P127E Fuel pump control circuit 2 (PCM) -open circuit Wiring, fuel pump, PCM
P127F Fuel pump control circuit 2 (PCM) over-current Wiring, poor connection, fuel pump, PCM
P1278 Starter control circuit 2 (PCM) -short circuit to positive Wiring, starter motor, PCM
P1279 Starter control circuit 2 (PCM) -open circuit Wiring, starter motor, PCM
P1280 Fuel pump relay -circuit malfunction Wiring, fuel pump relay
P1281 Engine temperature -low for long period Wiring, cooling system, coolant thermostat, ECTsensor
P1282 Fuel pump relay -wiring open/short circuit Wiring, fuel pump relay
P1288 Intake manifold air control solenoid (short runner) -wiring open/short circuit Wiring, intake manifold air control solenoid (short runner)
P1289 Intake manifold air control solenoid -wiring open/short circuit Wiring, intake manifold air control solenoid
P1294 Idle speed control (ISC) system -rpm lower/higher than expected Wiring, air leak, throttle valve tight/sticking, lAC valve
P1295 Throttle position (TP) sensor -no 5 volt supply Wiring, TP sensor, ECM
P1296 Manifold absolute pressure (MAP) sensor no 5 volt supply Wiring, MAP sensor, ECM
P1297 Manifold absolute pressure (MAP) sensor Wiring, hose connection(s), MAP sensor
P1298 System too lean -at prolonged wide open throttle Intake/exhaust leak, MAP sensor, fuel pressure/pump, injector(s), H02S
P1299 Manifold absolute pressure (MAP) sensor/throttle position (TP) sensor Intake leak, hose connection(s), MAP sensor, TP sensor
P1388 Engine control relay -wiring open/short circuit Wiring, engine control relay
P1389 Engine control relay -wiring open circuit Wiring, engine control relay
P1390 Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -signal synchronisation Timing belt loose/jumped position, CKP sensor, CMP sensor
P1391 Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -intermittent signal Wiring, poor connection, air gap, CKP sensor, CMP sensor
P1398 Engine control module (ECM) -misfire detection limit reached Wiring, poor connection, CKP sensor
P1403 Exhaust gas recirculation (EGR) valve position sensor no 5 volt supply Wiring, ECM
P1404 Exhaust gas recirculation (EGR) valve position sensor malfunction Wiring, exhaust gas recirculation (EGR) valve,ECM
P1411 Cylinder cut-out solenoid 1 -malfunction Wiring, cylinder cut-out solenoid, oil pressure, ECM
P1414 Cylinder cut-out solenoid 4 -malfunction Wiring, cylinder cut-out solenoid, oil pressure, ECM
P1416 Cylinder cut-out solenoid 6 -malfunction Wiring, cylinder cut-out solenoid, oil pressure, ECM
P1417 Cylinder cut-out solenoid 7 -malfunction Wiring, cylinder cut-out solenoid, oil pressure, ECM
P1451 Diesel particulate filter (DPF) -performance Wiring, exhaust, DPF pressure differential sensor,DPF, hose
P1452 Diesel particulate filter (DPF) pressure differential sensor hose performance Wiring, exhaust, DPF pressure differential sensor,DPF, hose
P1453 Diesel particulate filter (DPF) pressure differential sensor -hose blocked Wiring, exhaust, DPF pressure differential sensor,DPF, hose
P1454 Diesel particulate filter (DPF) pressure differential sensor -flow too high Wiring, exhaust, DPF pressure differential sensor, DPF, hose
P1475 Engine control module (ECM) -auxiliary 5 voltoutput high Wiring, ECM
P1476 Secondary air injection (AIR) system -insufficientflow detected AIR pump, AIR valve, AIR hose(s)
P1477 Secondary air injection (AIR) system -excessive flow detected AIR pump, AIR valve, AIR hose(s), ECM
P1478 P1479 Ambient/battery temperature sensor range/performance problem Transmissioncooling fan relay -circuit malfunction Wiring, ambient/battery temperature sensor Wiring, transmission fluid level low, transmission cooling fan, transmission cooling fan relay
P1480 Positive crankcase ventilation (PCV) solenoid -wiring open/short circuit Wiring, PCV solenoid
P1481 Transmission control module (TCM) -misfire detection Wiring, poor connection, CKP sensor, TCM
P1482 Catalytic converter temperature sensor -low input Wiring short circuit to ground, catalytic converter temperature sensor, ECM
P1483 Catalytic converter temperature sensor, high input -wiring short circuit to positive Wiring, catalytic converter temperature sensor, ECM
P1484 Catalytic converter -overheating Wiring, engine misfire, catalytic converter, catalytic converter temperature sensor
P1485 Secondary air injection (AIR) solenoid -circuit malfunction Wiring, AIR solenoid, ECM
P1486 Evaporative emission (EVAP) system blockage detected Hose connection(s), hose blocked/trapped, EVAP canister
P1487 Engine coolant blower motor relay, high speed -wiring open/short circuit Wiring, engine coolant blower motor relay (high speed)
P1488 Engine control module (ECM) -auxiliary 5 volt output low Wiring, ECM
P1489 AlC condenser blower motor relay, high speed -wiring open/short circuit Wiring, engine coolant blower motor relay (high speed)
P1490 Engine coolant blower motor relay, low speed -wiring open/short circuit Wiring, engine coolant blower motor relay (low speed)
P1491 Engine coolant blower motor relay open/shortcircuit Wiring, engine coolant blower motor
P1492 Ambient/battery temperature sensor -voltage high Wiring, ambient/battery temperature sensor
P1493 Ambient/battery temperature sensor -voltage low Wiring, ambient/battery temperature sensor
P1494 Evaporative emission (EVAP) leak detectionpump -pressure switch Wiring, hose leak/blockage, EVAP leak detection pump
P1495 Evaporative emission (EVAP) leak detection pump solenoid -wiring open/short circuit Wiring, hose leak/blockage, EVAP leak detection pump solenoid
P1496 Engine control module (ECM) -5 volt output low ECM
P1498 Engine coolant blower motor relay, high speed 3 -wiring open/short circuit Wiring, engine coolant blower motor relay (highspeed 3)
P1499 Engine coolant blower coupling solenoid -wiring open/short circuit Wiring, engine coolant blower coupling solenoid
P1501 Vehicle over-speed condition -rear axle speedgreater than front axle Wiring, VSS, mechanical fault, ECM
P1502 Vehicle over-speed condition -front axle speedgreater than rear axle Wiring, VSS, mechanical fault, ECM
P1513 Starter request circuit -switch stuck Wiring short to voltage, ECM
P1521 Engine oil sensor module -malfunction Wiring, connectors, oil quality, oil level
P1572 Brake pedal position (BPP) switch -circuit malfunction BPP switch adjustment, wiring, BPP switch
P1573 Brake pedal position (BPP) switch -circuit malfunction BPP switch adjustment, wiring, BPP switch
P1593 Cruise control system, mUlti-function input Acircuit stuck Wiring, poor connection, mUlti-function switch, mechanical fault, ECM
P1594 Alternator -voltage high Wiring, battery, alternator
P1595 Cruise control -wiring open/short circuit Wiring, hoses, cruise control master switch, cruisecontrol vacuum switching valve
P1596 Cruise control master switch -high voltage Wiring, cruise control master switch
P1597 Cruise control master switch -low voltage Wiring, cruise control master switch
P1598 AlC refrigerant pressure sensor -high input Wiring, AlC refrigerant pressure too high (coolingfault/incorrectly charged), AlC refrigerant pressure sensor
P1599 AlC refrigerant pressure sensor -low input Wiring, AlC refrigerant pressure too low(incorrectly charged), AlC refrigerant pressure sensor
P1602 Engine control module (ECM) not programmed New ECM not programmed, incorrectly programmed, ECM
P1603 Engine control module (ECM) -malfunction Wiring, fuse(s), ECM
P1604 Engine control module (ECM) -RAM read/writeerror ECM
P1607 Engine control module (ECM) -shut down timer error ECM
P1618 Engine control module (ECM) -primary 5 volt output erratic Wiring, poor connection, oil pressure sensor, APP sensor, CKP sensor, throttle control unit, TPS sensor, ECM
P1628 Engine control module (ECM) -auxiliary 5 volt output erratic Wiring, poor connection, APP sensor, CMP sensor, EGR solenoid, EGR valve position sensor, MAP sensor, ECM
P1646 Engine coolant hydraulic blower motor solenoid/circuit high -circuit malfunction Wiring, fuse, engine coolant hydraulic blower motor solenoid, ECM
P1647 Engine coolant hydraulic blower motor solenoid/circuit low -circuit malfunction Wiring, fuse, engine coolant hydraulic blower motor solenoid, ECM
P1648 Glow plug control module -malfunction Wiring, glow plug circuit, ECM
P1649 Glow plug control module/supply circuit circuit malfunction Wiring, fuse, ECM
P1652 Data bus, engine control module (ECM)/transmission control module (TCM) -no communication Wiring, CAN data bus, ECMITCM
P1680 Clutch pedal position (CPP) switch -circuit malfunction Wiring, CPP switch, ECM
P1681 CAN data bus, instrumentation -no signal Wiring, instrumentation control module
P1682 Alternator -voltage low Wiring, battery, alternator drive belt, alternator
P1683 Cruise control Wiring, cruise control vacuum switching valve
P1684 Engine control module (ECM) -supply voltage disconnected within last 50 ignition switch ON-OFF cycles Wiring, battery
P1685 Key not programmed into immobilizer control module Wiring, ignition key not matched/damaged, immobilizer control module
P1685 f) Immobilizer system Immobilizer control module, ECM
P1686 CAN data bus, immobilizer control module no signal Wiring, immobilizer control module
P1687 CAN data bus, instrumentation -no signal Wiring, instrumentation control module (mechanical)
P1692 Fault detected in engine control module (ECM) Companion trouble code detected in ECM
P1693 Fault detected in companion engine control module (ECM) Companion trouble code detected in ECM
P1694 CAN data bus, ECM -no signal Wiring, ECM
P1695 CAN data bus, BCM -no signal Wiring, SCM
P1696 Engine control module (ECM) -EEPROM error ECM
P1697 Engine control module (ECM) -EEPROM error ECM
P1698 CAN data bus, TCM -no signal Wiring, TCM
P1699 CAN data bus, AlC control module -no signal Wiring, AlC control module
P1715 Restricted port in T3 range Other trouble code(s) stored, transmission fluid level, transmission shift linkage adjustment D
P1719 Skip shift solenoid -wiring open/short circuit Wiring, skip shift solenoid
P1736 Transmission -gear/input speed/output speed ratioerror Transmission fluid level, wiring, input shaft speed (ISS) sensor, output shaft speed (055) sensor, transmission mechanical fault
P1740 Torque converter clutch (Tee)/overdrive solenoid -performance problem TCC, overdrive solenoid, transmission mechanical fault
P1756 Governor pressure not equal to target (15-20 PSI)-mid pressure malfunction Signal wire open/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply
P1757 Govemor pressure not equal to target (15-20 PSI) -zero pressure malfunction Signal wire open/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply
P1762 Govemor pressure sensor -incorrect signal Signal wire short circuit to ground/positive, supply wire open/short circuit, transmission fluid level, governor pressure solenoid, governor pressure sensor, ECM
P1763 Govemor pressure sensor -signal high Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
P1764 Governor pressure sensor -signal low Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
P1765 Transmission system relay -wiring open/short circuit Wiring, transmission system relay, ECM
P1775 Solenoid switch valve locked in Tee (torqueconverter clutch) position -wiring open/short circuit Wiring, transmission system relay, transmission fluid level low, UR pressure switch, solenoid switch valve
P1776 Solenoid switch valve locked in UR (low/reverse) position -wiring open/short circuit Wiring, transmission system relay, transmission fluid level low, UR pressure switch, solenoid switch valve
P1790 Fault immediately after shift Speed ratio error, transmission mechanical fault
P1793 Torque reduction communication error -wiring open/short circuit Wiring, ECMITCM
P1794 Transmission speed sensor -ground circuit Wiring open circuit, TCM, input shaft speed (ISS) sensor, output shaft speed (055) sensor
P1797 Manual shift overheat Wiring, transmission fluid level low, transmission cooling fan -if fitted, transmission fluid temperature (TFT) sensor
P1830 Clutch pedal position (CPP) switch override relay-circuit malfunction Wiring, CPP switch override relay, ECM
P1861 Transfer tube disconnected Wiring open circuit/short to ground, damaged fuel tank, fuel level sender
P1897 Engine speed calculation error ECM
P1899 Park/neutral position (PNP) switch -input circuit malfunction Wiring, PNP switch, ECM
U110A Controller area network (CAN) data bus -communication malfunction Wiring, steering column control module, multifunction control module, ECM
U110C Controller area network (CAN) data bus -communication malfunction Wiring, fuel level sensor, multifunction control module, ECM
U110E Outside air temperature sensor communication malfunction Wiring, outside air temperature sensor, multifunction control module, ECM
U1110 Wheel speed sensor -communication malfunction Wiring, speed sensor, anti-lock brake system(ABS) control module, ECM
U1111 Controller area network (CAN) data bus -communication malfunction Wiring, multifunction control module, ECM
U1113 AlC pressure sensor -communication malfunction Wiring, multifunction control module, ECM
U1120 Wheel speed sensor -communication malfunction Wiring, speed sensor, anti-lock brake system (ABS) control module, ECM
U1403 Control area network (CAN) data bus -fuel level -signal implausible Wiring, instrument panel, multifunction control module, ECM
U1411 Controller area network (CAN) data bus/fuel level-communication malfunction Wiring, instrumentation control module, multifunction control module, ECM
U1412 Wheel speed sensor -CAN data communication malfunction Wiring, wheel speed sensor, ABS control module, ECM
U1413 Controller area network (CAN) data bus/ instrument panel -signal implausible Wiring, instrumentation control module, multifunction control module, ECM
U1417 Wheel speed sensor, left -CAN data communication malfunction Wiring, wheel speed sensor, ABS control module, ECM
U1418 Wheel speed sensor, right -CAN data communication malfunction Wiring, wheel speed sensor, ABS control module, ECM