Dodge Ram Truck 5.9L Turbo Diesel (1996 – 1997) OBD1 Codes

Model	Year	Engine identification	System
Ram Truck 5.9L Turbo Diesel	1996-97	ETB	JTEC

General information

Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
Trouble codes can be displayed by the MIL or by using a Scan Tool connected to the data link connector (DLC).

Accessing

Flash codes

Within 5 seconds switch the ignition key ON-OFF-ON-OFF-ON.
Count MIL flashes. Note trouble codes.
Each trouble code consists of two groups [1] [A].
The first group of flashes indicate the ‘tens’ of the trouble code.
The second group of flashes indicate the ‘units’ of the trouble code.
A short pause separates ‘tens’ and ‘units’ [1] [D].
A long pause separates each trouble code [1] [E].
For example: Trouble code 42 displayed [1]
End of test sequence indicated by trouble code 55.

P codes & Hex codes

Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (DLC) [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 Ptype	Fault location	Probable cause
PO,P2,UO	Refer to OBO-II trouble code tables	–
P1492	Ambient/battery temperature sensor -voltage high	Wiring, ambient/battery temperature sensor, ECM
P1493	Ambient/battery temperature sensor -voltage low	Wiring, ambient/battery temperature sensor, ECM
P1496	Engine control module (ECM) -5 volt output low	ECM
P1696	Engine control module (ECM) -EEPROM error	ECM
P1756	Govemor pressure not equal to target (15-20 PSI) -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 -no 5 volt supply
P1757	Governor pressure not equal to target -low 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 -no 5 volt supply
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
P1763	Governor 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 circuit/short circuit, transmission system relay, ECM
P1899	Park/neutral position (PNP) switch -input circuit malfunction	Wiring, PNP switch, ECM

Flash code	Scan code Hex type	Fault location	Probable cause
11	28	Crankshaft position (CKP) sensor	Wiring, air gap, CKP sensor
12		Engine control module (ECM) -supply voltage disconnected within last 50 ignition switch ON-OFF cycles	Wiring, battery
15		Vehicle speed sensor (V55) -signal	Wiring, V55, ECM
	23	Vehicle speed sensor (V55) no signal	Wiring, V55, ECM
	A6	Output shaft speed (OSS) sensor -circuit malfunction	Wiring, 055 sensor, ECM
22		Engine coolant temperature (ECT) sensorvoltage low/high	Wiring, coolant thermostat, ECT sensor
	1E	Engine coolant temperature (ECT) sensor lowinput	Coolant thermostat, wiring short circuit to ground, ECT sensor
	1F	Engine coolant temperature (ECT) sensor highinput	Coolant thermostat, wiring open circuit/ short circuit to positive, ground wire defective, ECT sensor
23		Intake air temperature (IAT) sensor voltage low/high	Wiring, IAT sensor
	39	Intake air temperature (lAT) sensor -low input	Wiring short circuit to ground, IATsensor
	3A	Intake air temperature (IAT) sensor -high input	Wiring open circuit/short circuit to positive, ground wire defective, IAT sensor
24		Throttle position (TP) sensor -voltage low/ high	Wiring, accelerator cable adjustment, TP sensor
	1A	Throttle position (TP) sensor -low input	Wiring short circuit to ground, TP sensor
	1B	Throttle position (TP) sensor -high input	Wiring short circuit to positive, TP sensor
	84	Throttle position (TP) sensor -range/ performance problem	Wiring, accelerator cable adjustment, TP sensor
32	11	Exhaust gas recirculation (EGR) -circuit malfunction	Wiring, EGR solenoid, EGR control module, ECM
33	10	AlC compressor clutch relay	Wiring open circuit/short circuit, AlC compressor clutch relay
34		Cruise control	Wiring open circuit/short circuit, hoses, voltage low/high, cruise control master switch, cruise control vacuum switching valve
	OF	Cruise control	Wiring open circuit/short circuit, hoses, voltage low/high, cruise control vacuum switching valve
	56	Cruise control master switch -high voltage	Wiring, cruise control master switch
	57	Cruise control master switch -low voltage	Wiring, cruise control master switch
37		Transmission control system -malfunction	Wiring, transmission fluid level, transmission mechanical fault, PNP switch, TCC solenoid,TFT sensor, TFP solenoid, 55, governor pressure solenoid, transmission system relay, ECM
	OC	Torque converter clutch (TCC) solenoid -electrical	Wiring open circuit/short circuit, TCC solenoid
	32	5hift solenoid (55) 3-4 -electrical	Wiring, 55, ECM
37	4A	Transmission fluid temperature (TFT) sensorlow input	Wiring short circuit to ground, TFT sensor,ECM
	4B	Transmission fluid temperature (TFT) sensor high input	Wiring short circuit to positive, TFT sensor, ECM
	72	Park/neutral position (PNP) switch -inputcircuit malfunction	Wiring, PNP switch, ECM
	80	Governor 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-no 5 volt supply
	BE	Govemor pressure not equal to target -low 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 no 5 volt supply
	94	Torque converter clutch (TCC) solenoid circuit malfunction	Wiring, TCC solenoid
	A4	Transmission fluid temperature (TFT) sensor range/performance problem	Wiring, TFT sensor
	AS	Gear selection, 3-4 shift malfunction	Wiring, TR sensor, shift solenoids, transmission mechanical fault
	AB	Transmission fluid pressure (TFP) solenoid -electrical	Wiring, TFP solenoid, ECM
	AD	Transmission system relay	Wiring open circuit/short circuit, transmission system relay, ECM
41	OB	Alternator, field control -circuit malfunction	Wiring open circuit/short circuit, alternator,battery
42		Engine control relay/fuel level sensor circuit malfunction	Wiring open circuit/short circuit, engine control relay, fuel level sensor
	OA	Engine control relay	Wiring open circuit/short circuit, engine control relay
	2C	Engine control relay	Wiring open circuit, engine control relay
	95	Fuel level sensor -low input	Wiring open circuit, fuel level sensor
	96	Fuel level sensor -high input	Wiring short circuit to positive, fuel level sensor
	97	Fuel level sensor -malfunction	Wiring, fuel level sensor
44		Ambient/battery temperature sensor voltagelow/high	Wiring, ambient/battery temperature sensor, ECM
	9A	Ambient/battery temperature sensor voltage high	Wiring, ambient/battery temperature sensor, ECM
	99	Ambient/battery temperature sensor-voltage low	Wiring, ambient/battery temperature sensor,ECM
45		Transmission control system -malfunction	Wiring, transmission fluid level, transmission mechanical fault, PNP switch, TCC solenoid,TFT sensor, TFP solenoid, shift solenoid, overdrive solenoid/switch, governor pressure solenoid, transmission system relay, ECM
	32	Shift solenoid (SS) 3-4 -electrical	Wiring, 55, ECM
	4A	Transmission fluid temperature (TFT) sensorlow input	Wiring short circuit to ground, TFT sensor,ECM
	4B	Transmission fluid temperature (TFT) sensorhigh input	Wiring short circuit to positive, TFT sensor,ECM
	80	Governor 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 no 5 volt supply
	8E	Governor pressure not equal to target, -low 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 no 5 volt supply
	A4	Transmission fluid temperature (TFT) sensor range/perfonmance problem	Wiring, TFT sensor
	A5	Gear selection, 3-4 -shift malfunction	Wiring, TR sensor, shift solenoids, transmission mechanical fault
	A7	Governor pressure sensor -signal low	Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
	AS	Governor pressure sensor -signal high	Signal wire short circuit to positive, supply wire open circuit, transmission fluid level,governor pressure sensor, ECM
	A9	Governor 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
	AB	Transmission fluid pressure (TFP) solenoid -electrical	Wiring, TFP solenoid, ECM
	AD	Transmission system relay	Wiring open circuit/short circuit, transmission system relay, ECM
	BC	Overdrive solenoid/switch -performanceproblem	Wiring, overdrive solenoid/switch,transmission mechanical fault, ECM
46	6	Alternator -voltage high	Wiring, battery, alternator
47	5	Alternator -voltage low	Wiring, battery, alternator drive belt, alternator
53		Engine control rnodule (ECM) -internal fault	ECM
	2	Engine control module (ECM) intemal fault	ECM
	44	Engine control module (ECM) internal fault	ECM
55		End of MIL lamp code output	–
63	31	Engine control module (ECM) -EEPROM error	ECM
65	73	Power steering pressure (PSP) switch -range/performance problem	Wiring, PS system, PSP switch
68	8C	Exhaust gas recirculation (EGR) system -flow malfunction	Hose leak/blockage, wiring, EGR valve, EGR solenoid, EGR control module, ECM
71	89	Engine control module (ECM) -5 volt output low	ECM
77	52	Cruise control	Wiring, cruise control vacuum switching valve