Jeep Cherokee 2.5/4.0L – Grand Cherokee 4.0/5.2L – Wrangler 2.5/4.0L (1996 – 1997) OBD1 Codes

Model	Year	Engine identification	System
Cherokee 2.5L	1996·97	VIN position 8 = P	JTEC
Cherokee 4.0L	1996·97	VIN position 8 = S	JTEC
Grand Cherokee 4.0L	1996·97	VIN position 8 = S	JTEC
Grand Cherokee 5.2L	1996·97	VIN position 8 = Y	JTEC
Wrangler 2.5L	1996·97	VIN position 8 = P	JTEC
Wrangler 4.0L	1996·97	VIN position 8 = S	JTEC

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.
Trouble codes can be displayed by the MIL, digital odometer 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] [B].
A long pause separates each trouble code [1] [C].
For example: Trouble code 21 displayed [1]
End of test sequence indicated by trouble code 55.
Trouble codes can also be displayed by the digital odometer using the same key cycling procedure as above. After code 55 is displayed the odometer will return to its normal mode.

P codes & Hex codes

• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC):

Cherokee/Wrangler [2]
Grand Cherokee [3]

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 OBD-II trouble code tables	–
P1294	Idle speed control (ISC) system -rpm lower/ higherthan expected	Wiring, air leak, throttle valve tight/sticking, lAC valve
P1296	Manifold absolute pressure (MAP) sensor supply voltage	Wiring, MAP sensor, ECM
P1297	Manifold absolute pressure (MAP) sensor	Wiring, hose connection(s), MAP 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, engine mechanical fault, ignition/fuel system, CKP sensor, ECM
P1486	Evaporative emission (EVAP) system blockage detected	Hose connection(s), hose blocked/trapped, EVAP canister
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
P1494	Evaporative emission (EVAP) leak detection pump -pressure switch	Wiring, hose leak!blockage, EVAP leak detection pump
P1495	Evaporative emission (EVAP) leak detection pump solenoid	Wiring open circuit/short circuit, hose leak! blockage, EVAP leak detection pump solenoid
P1698	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	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
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	Govemor pressure sensor -signal high	Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
P1764	Govemor 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		Crankshaft position (CKP) sensor/camshaft position (CMP) sensor	Wiring, poor connection, air gap, CKP sensor,CMP sensor
	28	Crankshaft position (CKP) sensor no signal	Wiring, air gap, CKP sensor
	90	Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -intermittent signal	Wiring, poor connection, air gap, CKP sensor,CMP sensor
	BA	Engine control module (ECM) -misfire detection limit reached	Wiring, poor connection, engine mechanical fault, ignition/fuel system, CKP sensor, ECM
12		Engine control module (ECM) -supply voltage disconnected within last 50 ignition switch ON-OFF cycles	Wiring, battery
13	27	Manifold absolute pressure (MAP) sensor	Wiring, hose connection(s), MAP sensor
14		Manifold absolute pressure (MAP) sensor input low/high	Wiring, MAP sensor
	24	Manifold absolute pressure (MAP) sensor low input	Wiring short circuit to ground, MAP sensor
	25	Manifold absolute pressure (MAP) sensor high input	Wiring short circuit to positive, MAP sensor
	87	Manifold absolute pressure (MAP) sensor supply voltage	Wiring, MAP sensor, ECM
15		Vehicle speed sensor (VSS) -signal	Wiring, VSS, ECM
	23	Vehicle speed sensor (VSS) -no signal	Wiring, VSS, ECM
	A6	Vehicle speed sensor (VSS) -circuit malfunction	Wiring, VSS, ECM
17		Engine temperature -low for long period	Wiring, cooling system, coolant thermostat, ECl sensor
	21	Engine temperature -low for long period	Wiring, cooling system, coolant thermostat, ECl sensor
	80	Insufficient coolant temperature for closed loop fuel control	Wiring, cooling system, coolant thermostat, ECT sensor
21		Heated oxygen sensor (H02S) 1/2, bank 1 -circuit/signal malfunction	Wiring, fuel pressure, injector control, EVAP canister purge valve, compression, air filter blocked, catalytic converter, H02S
	3E	Heated oxygen sensor (H02S) 1, bank 1 high voltage	Wiring short circuit to positive, H02S
	66	Heated oxygen sensor (H02S) 1, bank 1 slow response	Heating inoperative, wiring, H02S
	67	Heated oxygen sensor (H02S) 1, bank 1 heater control -circuit malfunction	Wiring, H02S
	69	Heated oxygen sensor (H02S) 2, bank 1,heater control -circuit malfunction	Wiring, H02S
	7E	Heated oxygen sensor (H02S) 2, bank 1 high voltage	Wiring short circuit to positive, catalytic converter, H02S
	98	Heated oxygen sensor (H02S) 1, bank 1 low voltage	Exhaust leak, wiring short circuit to ground, H02S
	9C	Heated oxygen sensor (H02S) 2, bank 1 low voltage	Exhaust leak, wiring short circuit to ground, H02S
	CO	Heated oxygen sensor (H02S) 1, bank 1 slow response	Heating inoperative, wiring, H02S
22		Engine coolant temperature (ECT) sensor voltage low/high	Wiring, coolant thermostat, ECT sensor
	1E	Engine coolant temperature (ECT) sensor low input	Coolant thermostat, wiring short circuit to ground, ECT sensor
	1F	Engine coolant temperature (ECT) sensor high input	Coolant thermostat, wiring open circuit! short circuit to positive, ground wire defective, ECT sensor
23		Intake air temperature (IAT) sensor voltagelow/high	Wiring, IAT sensor
	39	Intake air temperature (IAT) sensor -low input	Wiring short circuit to ground, IAT sensor
	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
25		Idle air control (lAC) valve	Wiring open circuit/short circuit, lAC valve
	19	Idle speed control (ISC) system malfunction	Wiring open circuit/short circuit, lAC valve
	8A	Idle speed control (ISC) system -rpmlower/higher than expected	Wiring, air leak, throttle valve tight/ sticking, lAC valve
27		Injector(s) -circuit malfunction	Wiring, injector
	13	Injector 3 -circuit malfunction	Wiring, injector
	14	Injector 2 -circuit malfunction	Wiring, injector
	15	Injector 1 -circuit malfunction	Wiring, injector
	3D	Injector 4 -circuit malfunction	Wiring, injector
	45	Injector 5 -circuit malfunction	Wiring, injector
	46	Injector 6 -circuit malfunction	Wiring, injector
	4F	Injector 7 -circuit malfunction	Wiring, injector
	50	Injector 8 -circuit malfunction	Wiring, injector
31		Evaporative emission (EVAP) canister purge valve/system	Wiring, EVAP canister, EVAP canister purge valve
	12	Evaporative emission (EVAP) canister purge valve -circuit malfunction	Wiring open circuit/short circuit, EVAP canister purge valve
	71	Evaporative emission (EVAP) system incorrectflow detected	Hose connection(s), intake leak, EVAP canister purge valve
	AO	Evaporative emission (EVAP) system -small leak detected	Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
	A1	Evaporative emission (EVAP) system -large leak detected	Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
	BB	Evaporative emission (EVAP) system -blockage detected	Hose connection(s), hose blocked! trapped, EVAP canister
31	88	Evaporative emission (EVAP) leak detection pump -pressure switch	Wiring, hose leak/blockage, EVAP leak detection pump
	87	Evaporative emission (EVAP) leak detectionpump solenoid	Wiring open circuit/short circuit, hose leak/blockage, EVAP leak detection pump solenoid
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
35	OE	Engine coolant blower motor relay	Wiring open circuit/short circuit, engine coolant blower motor relay -low/high speed
37		Transmission control system -malfunction	Wiring, transmission fluid level, transmission mechanical fault, PNP switch, TCC solenoid, TFT sensor, TFP solenoid, shift solenoid, governor pressure solenoid, transmission system relay, ECM
	OC	Torque converter clutch (TCC) solenoid -electrical	Wiring open circuit/short circuit, TCC solenoid
	32	Shift solenoid (SS) 3-4 electrical	Wiring, shift solenoid, ECM
	72	Park/neutral position (PNP) switch -input circuit malfunction	Wiring, PNP switch, ECM
	80	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 no 5 volt supply
	8E	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
37	AS	Gear selection, 3-4 -shift malfunction	Wiring, TR sensor, shift solenoids, transmission mechanical fault
	AS	Transmission fluid pressure (TFP) solenoid -electrical	Wiring, TFP solenoid, ECM
	AD	Transmission system relay	Wiring open circuit/short circuit, transmission system relay, ECM
	4A	Transmission fluid temperature (TFT) sensor low input	Wiring short circuit to ground, TFT sensor, ECM
	48	Transmission fluid temperature (TFT) sensor high input	Wiring short circuit to positive, TFT sensor,ECM
41	8	Alternator, field control -circuit malfunction	Wiring open circuit/short circuit, alternator, battery
42		Fuel pump relay/engine control relay/fuel level sensor -circuit malfunction	Wiring open circuit/short circuit, fuel pump relay, 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
	65	Fuel pump relay	Wiring open circuit/short circuit, fuel pump 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
43		Random/multiple cylinder(s) -misfire detected	Wiring, spark plug(s), HT lead(s), injector(s),ignition coil(s), low compression
	6A	Random/multiple cylinder(s) -misfire detected	Wiring, spark plug(s), HT lead(s), injector(s), ignition coil(s), low compression
	68	Cylinder 1 -misfire detected	Wiring, engine mechanical fault, ignition/ fuel system, injector
	6C	Cylinder 2 -misfire detected	Wiring, engine mechanical fault, ignitionl fuel system, injector
	60	Cylinder 3 -misfire detected	Wiring, engine mechanical fault, ignition/ fuel system, injector
	6E	Cylinder 4 -misfire detected	Wiring, engine mechanical fault, ignition/ fuel system, injector
	AE	Cylinder 5 -misfire detected	Wiring, engine mechanical fault, ignition/ fuel system, injector
	AF	Cylinder 6 -misfire detected	Wiring, engine mechanical fault, ignitionl fuel system, injector
	80	Cylinder 7 -misfire detected	Wiring, engine mechanical fault, ignitionl fuel system, injector
43	81	Cylinder 8 -misfire detected	Wiring, engine mechanical fault, ignition/ fuel system, injector
	28	Ignition coil A, primary -circuit malfunction	Wiring, ignition coil
44		Ambient/battery temperature sensor voltage low/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, shift solenoid, ECM
	4A	Transmission fluid temperature (TFT) sensor low input	Wiring short circuit to ground, TFT sensor, ECM
	48	Transmission fluid temperature (TFT) sensor high input	Wiring short circuit to positive, TFT sensor, ECM
	8D	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 -no 5 volt supply
	8E	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
	A4	Transmission fluid temperature (TFT) sensorrange/performance problem	Wiring, TFT sensor
	A5	Gear selection, 3-4 shift malfunction	Wiring, TR sensor, shift solenoids, transmission mechanical fault
	A7	Govemor pressure sensor -signal low	Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
	A8	Governor pressure sens.or signal high	Signal wire short circuit to poSitive, supply wire open circuit, transmission fluid level,governor pressure sensor, ECM
45	A9	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
	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 -performance problem	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
51	77	System too lean	Wiring, intake/exhaust leak, MAP sensor, fuel pressure/pump, EVAP canister purge valve,injector(s), H02S
52	76	System too rich	Wiring, intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), air filter blocked, ignition system, H02S
53		Engine control module (ECM) -intemal fault	ECM
	2	Engine control module (ECM) -intemal fault	ECM
	44	Engine control module (ECM) -internal fault	ECM
54	1	Camshaft pOSition (CMP) sensor -no signal	Wiring, CMP sensor
55		End of MIL code output	–
63	31	Engine control module (ECM) -EEPROM error	ECM
72	70	Catalytic converter system, bank 1 efficiency below threshold	Catalytic converter, wiring, H02S 2
77	52	Cruise control	Wiring, cruise control vacuum switching valve