Cherokee, Grand Cherokee, 1999-2005

4.7L V8 VIN N Auto 3

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Trouble Code: P0306



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0307



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0308



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0309



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0310



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0315



No Crankshaft Position Sensor Learned

Possible Causes:



Crankshaft tone wheel flex plate is damaged
 
Tone wheel/pulse ring may be damaged
 
Erratic CKP Sensor signals (wiring/connector problem)
 
CKP Sensor has failed
 
PCM has failed
 

Trouble Code: P0320



No Crank Reference Signal to PCM

Possible Causes:



CKP Sensor signal circuit is open or grounded
 
CKP Sensor VREF circuit is open or grounded
 
Tone wheel or flex plate damage or erratic CKP Sensor signals
 
CKP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0325



Knock Sensor No. 1 Circuit

Possible Causes:



Knock Sensor connector is damaged or shorted
 
Knock Sensor signal circuit open or grounded
 
Knock Sensor signal circuit shorted to return circuit
 
Knock Sensor return circuit is open
 
Knock Sensor not tightened properly
 
Knock Sensor damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0330



Knock Sensor No. 2 Circuit

Possible Causes:



Knock Sensor No. 2 signal circuit shorted to battery voltage or to KS 2 return circuit
 
Knock Sensor No. 2 signal circuit or return circuit is open
 
Knock Sensor No. 2 signal circuit is shorted to KS 2 return circuit or to ground
 
Knock Sensor damaged or has failed
 
PCM has failed
 

Trouble Code: P0335



Crankshaft Position Sensor Circuit

Possible Causes:



Intermittent CKP signal
 
CKP Sensor signal circuit is open or it is shorted to ground or voltage
 
CKP Sensor 5v supply circuit is open or shorted to ground or voltage
 
CKP Sensor ground circuit is open
 
CKP Sensor or CMP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0339



Crankshaft Position Sensor Circuit Intermittent

Possible Causes:



Check the tone wheel/pulse ring for damage or debris collection
 
CKP Sensor signal circuit is open or shorted to ground
 
CKP Sensor 5v supply circuit is open or shorted to ground
 
CKP Sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0340



No Camshaft Position Sensor Circuit Failure

Possible Causes:



CMP Sensor connector is damaged, open or it is shorted
 
CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit
 
CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage
 
CMP Sensor ground circuit is open
 
CMP Sensor is damaged or has failed
 
CKP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0344



Camshaft Position Sensor Circuit Intermittent

Possible Causes:



Wiring harness fault
 
5v supply circuit open or shorted to ground
 
Tone wheel/pulse ring is damaged or corroded
 
CMP Sensor has failed
 
CMP Sensor signal circuit is open, shorted to ground or battery voltage or 5v supply
 
CMP Sensor ground circuit is open
 
PCM has failed
 

Trouble Code: P0351



Ignition Coil No. 1, 2 or 3 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition Coil No. 1, 2 or 3 primary "driver" circuit open or grounded
 
Ignition Coil No. 1, 2 or 3 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0352



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0353



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0354



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0355



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0356



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0357



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0358



Ignition Coil No. 1-8 Primary Circuit

Possible Causes:



ASD relay power circuit to the ignition coil is open
 
Ignition coil primary "driver" circuit open or grounded
 
Ignition coil is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0401



EGR System Malfunction

Possible Causes:



EGR valve source vacuum supply line open or blocked
 
EGR exhaust transfer tubes blocked in the exhaust manifold
 
EGR transducer tube to the transducer is blocked or restricted
 
EGR valve or solenoid transducer is damaged or has failed
 
PCM has failed
 

Trouble Code: P0403



EGR Solenoid Circuit

Possible Causes:



EGR solenoid ground circuit is open
 
EGR solenoid control circuit is open or shorted to ground or to voltage
 
EGR solenoid power circuit is open
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0404



EGR Position Sensor Signal Performance

Possible Causes:



EGR Sensor signal circuit is open or shorted to ground
 
EGR Sensor 5v supply circuit is open or has high resistance
 
EGR Sensor ground circuit is open
 
EGR solenoid control circuit has a problem
 
EGR valve actuator loose, sticking, blocked or improperly grounded
 
EGR Sensor is damaged or has failed
 
Intermittent condition
 
PCM has failed
 

Trouble Code: P0405



EGR Position Sensor Circuit Low Input

Possible Causes:



EGR Sensor signal circuit is shorted to ground or open
 
EGR Sensor VREF (5v) circuit is open or shorted to ground
 
EGR Sensor is damaged (shorted internally) or it has failed
 
EGR position internal failure
 
PCM has failed
 

Trouble Code: P0406



EGR Position Sensor Circuit High Input

Possible Causes:



Intermittent condition
 
EGR Sensor signal is shorted to VREF (5v) supply circuit or to battery voltage
 
EGR Sensor ground circuit is open
 
EGR Sensor signal circuit is open
 
EGR Sensor is damaged (it may have an internal open circuit)
 
EGR solenoid failure
 
PCM has failed
 

Trouble Code: P0420



Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks in at the exhaust manifold or exhaust pipes
 
Base engine problems (high coolant or engine oil consumption)
 
Catalytic converter damaged or has failed
 
Front O2 older (aged) than the rear O2 (O2 is lazy)
 

Trouble Code: P0430



Catalyst (2/1) Efficiency Below Normal

Possible Causes:



Exhaust leaks
 
Base engine problems
 
Catalytic converter damaged or has failed
 
Front O2 older (aged) than the rear O2 (O2 is lazy)
 

Trouble Code: P0432



Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:



Air leaks in at the exhaust manifold or exhaust pipes
 
Base engine problems (high coolant or engine oil consumption)
 
Catalytic converter damaged or has failed
 
Front O2 older (aged) than the rear O2 (O2 is lazy)
 

Trouble Code: P0440



EVAP Purge System Fault

Possible Causes:



EVAP purge valve vacuum supply is leaking or clogged
 
EVAP purge valve is stuck closed
 
EVAP purge solenoid has failed
 
NVLD assembly (leak detection) is damaged or has failed
 
NVLD switch circuit is open or the NVLD switch has failed
 
Ground circuit is open
 
PCM has failed
 

Trouble Code: P0441



EVAP Purge Flow Monitor Fault

Possible Causes:



EVAP purge solenoid vacuum line loose, leaking or restricted
 
EVAP purge solenoid stuck leaking, stuck open or stuck closed
 
EVAP purge vacuum line to canister leaking or disconnected
 
EVAP canister leaking, damaged or has failed
 

Trouble Code: P0442



EVAP System Small Leak Detected

Possible Causes:



EVAP fuel tank or canister vapor hoses leaking or damaged
 
EVAP system component leaking, damaged or has failed
 
Fuel tank cap is loose, or the cap release pressure is incorrect
 
Leak detection pump damaged or leaking
 

Trouble Code: P0443



EVAP Purge Solenoid Circuit Fault

Possible Causes:



EVAP purge solenoid control circuit open or shorted to ground
 
EVAP purge solenoid power circuit open
 
EVAP purge solenoid is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0452



NVLD Pressure Switch Sense Circuit Low Input

Possible Causes:



EVAP purge solenoid control circuit is shorted to ground
 
EVAP purge solenoid is leaking or it is stuck in open position
 
NVLD assembly or NVLD switch is damaged or it has failed
 
NVLD switch signal circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0453



NVLD Pressure Switch Sense Circuit High Input

Possible Causes:



NVLD assembly ground circuit is open
 
NVLD switch signal circuit is open or shorted to power (B+) or to NVLD solenoid control circuit
 
NVLD assembly or switch is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0455



EVAP Large Leak Detected

Possible Causes:



EVAP purge solenoid is damaged or it has failed
 
Fuel tank cap is damaged, missing or the wrong part number
 
NVLD switch is damaged or it has failed
 

Trouble Code: P0456



EVAP Small Leak (0.020") Detected

Possible Causes:



EVAP fuel tank or canister vapor hoses leaking or damaged
 
EVAP system component leaking, fuel cap loose or missing
 
Leak detection pump damaged or leaking
 

Trouble Code: P0457



Loose Fuel Cap Condition:

Possible Causes:



Loose or missing fuel fill cap
 
Intermittent condition
 
NVLD system or switch malfunction
 
EVAP system leaking
 
EVAP purge solenoid malfunction
 

Trouble Code: P0460



Fuel Level Sending No Change Over Miles

Possible Causes:



Fuel level sending unit signal circuit open or shorted to ground
 
Fuel level sending unit ground circuit is open
 
Fuel level sensing unit is damaged or the fuel tank is damaged
 

Trouble Code: P0461



Fuel Level Sensor No. 1 Malfunction

Possible Causes:



Fuel tank or internal siphon hose damage
 
Fuel level signal circuit open or shorted to ground
 
Ground circuit is open
 
Fuel level Sensor malfunction
 

 
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