Ram Truck 5.9L Turbo Diesel (1999 – 2002)

Model Year Engine identification System
Ram Truck 5.9L Turbo Diesel 1999-02 ETC   Cummins CM551/A

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) 1

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 OBO-II trouble code tables
P1110 Decreased engine performance -high intake air temperature Wiring open circuit/short to positive, ground wiredefective, IAT sensor, ECT sensor, cooling system, high engine bay temperature, intake manifold heater relay(s), intake manifold heater(s), ECM 1
P1180 Decreased engine performance -high injection pump fuel temperature Wiring open circuit/short to positive, ground wire defective, fuel temperature sensor, fueltemperature sensor, mechanical fault, high engine bay temperature, ECM 1
P1192 Intake air temperature (IAT) sensor -voltage low Wiring, IAT sensor, ECM 1
P1193 Intake air temperature (IAT) sensor -voltage high Wiring, IAT sensor, ECM 1
P1281 Engine temperature -low for long period Wiring, cooling system, coolant thermostat, ECT sensor
P1283 Engine control module (ECM) 1 -idle signal malfunction Wiring, injection pump control module g, ECM 1
P1284 Injection pump control module -battery voltage out of range Wiring, injection pump control module, ECM 1
P1285 Injection pump control module relay -circuitmalfunction Wiring, injection pump control module relay
P1286 Accelerator pedal position (APP) sensor -highinput Wiring short to positive, APP sensor, ECM 1
P1287 Injection pump control module/engine control module (ECM) 1 -supply voltage low Wiring, battery, alternator
P1291 Intake manifold heaters -no temperature rise Wiring, intake manifold heater relay(s), intakemanifold heater(s), ECM 1
P1295 Accelerator pedal position (APP) sensor -low input Signal wire short circuit to ground, supply wire open circuit, APP sensor, ECM 1
P1296 Manifold absolute pressure (MAP) sensor no 5 volt supply Wiring, MAP sensor, ECM 1
P1297 Manifold absolute pressure (MAP) sensor Wiring, hose connection(s), MAP sensor
P1388 Engine control relay Wiring open circuit/short circuit, engine control relay, ECM 2
P1389 Engine control relay Wiring open circuit, engine control relay, ECM 2
P1399 Glow plug waming lamp -circuit malfun~tion Wiring, glow plug warning lamp, ECM 1
P1475 Engine control module (ECM) 1 -auxiliary 5 volt output high Wiring, ECM 1
P1478 AmbienUbattery temperature sensor -range/ performance problem Wiring, ambient/battery temperature sensor
P1488 Engine control module (ECM) 1 -auxiliary 5 volt output low Wiring, ECM 1
P1492 AmbienUbattery temperature sensor -voltage high Wiring, ambient/battery temperature sensor
P1493 AmbienUbattery temperature sensor -voltage low Wiring, ambient/battery temperature sensor
P1496 Engine control module (ECM) 1 -5 volt output low ECM 1
P1594 Alternator -voltage high j Wiring, battery, alternator
P1595 Cruise control Wiring open circuit/short circuit, hoses, cruise control master switch, cruise control vacuum switching valve, ECM 2
P1596 Cruise control master switch -high voltage Wiring, cruise control master switch, ECM 2
P1597 Cruise control master switch -low voltage Wiring, cruise control master switch, ECM 2
P1602 Engine control module (ECM) 1 not programmed New ECM not programmed, incorrectly programmed, ECM 1
P1682 Altemator -voltage low Wiring, battery, alternator drive belt, alternator
P1683 Cruise control Wiring, cruise control vacuum switching valve, ECM 2
P1684 Engine control module (ECM) 1 -supply voltage disconnected within last 50 ignition switch ON-OFF cycles Wiring, battery
P1688 Injection pump/injection pump control module -intemal fault Injection pump/injection pump control module
P1689 Injection pump control module communication to engine control module (ECM) 1 malfunction Wiring, poor connection, injection pump control module, ECM 1
P1690 Crankshaft position/injection pump camshaft position sensor -correlation Wiring, CKP sensor, injection pump CMP sensor, mechanical fault, ECM 1
P1691 Injection pump -intemal fault Injection pump/injection pump control module D
P1693 Engine control module (ECM) 1 Companion module trouble code detected in ECM 1
P1694 CAN data bus, engine control module (ECM) 1no signal Wiring, ECM 1
P1696 Engine control module (ECM) 1 -EEPROM error ECM 1
P1698 CAN data bus, engine control module (ECM) 2no signal Wiring, ECM 2
P1719 Skip shift solenoid -circuit malfunction Wiring open circuit/short circuit, skip shift solenoid
P1740 Torque converter clutch (TCC)/overdrive solenoid-performance problem TCC, overdrive solenoid, transmission mechanical fault
P1756 Govemor pressure not equal to target (15-20PSI) -mid pressure malfunction Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM 2 no 5 volt supply f)
P1757 Govemor pressure not equal to target (15-20 PSI) -zero pressure malfunction Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM 2 -no 5 volt supply f)
P1762 Govemor pressure sensor -incorrect signal Signal wire short circuit to ground/ positive, supply wire open circuit/short circuit, transmission fluid level, governor pressure solenoid, governor pressure sensor, ECM 2 f)
P1763 Governor pressure sensor -signal high Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM 2 6
P1764 Governor pressure sensor -signal low Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM 2 6
P1765 Transmission system relay Wiring open circuit/short circuit, transmission system relay, ECM 2
P1899 Park/neutral position (PNP) switch -input circuit malfunction Wiring, PNP switch, ECM 2