Liberty, Wrangler, 1997-2005

2.8L L4 VIN 5 Std 3

Print

Trouble Code: P0251



Fuel Quality Solenoid Open Or Short Circuit

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid or ECM has failed
 

Trouble Code: P0252



Fuel Quality Solenoid Circuit Malfunction

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid or ECM has failed
 

Trouble Code: P0253



Fuel Quality Solenoid Short To Ground Circuit

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid has failed
 
ECM has failed
 

Trouble Code: P0254



Fuel Quality Solenoid Short Circuit

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid has failed
 
ECM has failed
 

Trouble Code: P0299



Turbo Boost Pressure Positive Deviation Performance

Possible Causes:



Air filter is clogged or malfunctioning
 
Air restrictions exist in intake or boost components
 
Air leaks exist in intake or boost components
 
Boost control vacuum supply is insufficient
 
Boost pressure actuator is malfunctioning or has failed
 
Turbocharger is malfunctioning or has failed
 

Trouble Code: P0300



Multiple Cylinder Misfire

Possible Causes:



ASD relay output circuit fault
 
Injector control circuit fault
 
Coil control circuit fault
 
Ignition wiring, coil control circuit or coil fault
 
Fuel pump inlet strainer plugged
 
Restricted fuel supply line
 
Fuel pump module is damaged
 
Fuel pressure leakdown fault
 
Fuel injector damaged or has failed
 
Engine mechanical problems exist
 
PCM has failed
 

Trouble Code: P0301



Misfire Detected In Specific Cylinder

Possible Causes:



Engine compression problems exist
 
Fuel injector quantity is insufficient
 
Fuel injector leaking
 
Intermittent condition
 

Trouble Code: P0302



Misfire Detected In Specific Cylinder

Possible Causes:



Engine compression problems exist
 
Fuel injector quantity is insufficient
 
Fuel injector leaking
 
Intermittent condition
 

Trouble Code: P0303



Misfire Detected In Specific Cylinder

Possible Causes:



Engine compression problems exist
 
Fuel injector quantity is insufficient
 
Fuel injector leaking
 
Intermittent condition
 

Trouble Code: P0304



Misfire Detected In Specific Cylinder

Possible Causes:



Engine compression problems exist
 
Fuel injector quantity is insufficient
 
Fuel injector leaking
 
Intermittent condition
 

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: 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 signal circuit open or is shorted to ground or to voltage
 
Knock Sensor return circuit is open
 
Knock Sensor signal circuit is short to KS return circuit
 
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: P0401



EGR System Fault

Possible Causes:



EGR valve is open at idle
 
EGR solenoid ground circuit is open
 
EGR solenoid control circuit is open, shorted to ground or to voltage
 
ASD relay power circuit open to the EGR solenoid
 
EGR valve or solenoid is damaged or has failed
 
PCM has failed (EGR open or EGR closed)
 

Trouble Code: P0402



EGR Solenoid Circuit Deviation

Possible Causes:



Air filter is restricted or damaged
 
Air restrictions in intake air system or EGR system
 
Air leaks in intake air system or EGR system
 
EGR valve has malfunctioned or failed
 
Intermittent condition
 

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: 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 Medium Leak Detected

Possible Causes:



Intermittent condition
 
Vacuum hoses, connections or switches have come loose or malfunctioned
 
EVAP emission system has a leak
 
EVAP purge solenoid operation has malfunctioned
 
NVLD switch operation has malfunctioned
 

Trouble Code: P0443



EVAP Purge Solenoid Circuit Fault

Possible Causes:



EVAP purge solenoid control circuit open or shorted to ground
 
EVAP purge solenoid return circuit open or shorted to ground
 
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 System Small Leak Detected

Possible Causes:



Fuel tank cap is damaged, loose or the wrong part number
 
Small leak present somewhere in the EVAP system
 

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 Sensor Circuit Signal Voltage Too High Or Too Low

Possible Causes:



Intermittent condition
 
Fuel Level Sensor signal circuit is open or is shorted to voltage (too high)
 
Fuel Level Sensor ground circuit is open (too high)
 
Fuel Level Sensor signal circuit is short to ground (too low)
 
Fuel Level Sensor signal circuit and ground circuit are shorted together (too low)
 
Fuel Level Sensor has failed
 
FCM has failed
 

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
 

Trouble Code: P0462



Fuel Level Sensor No. 1 Low Input

Possible Causes:



Intermittent condition
 
Fuel level sending unit signal circuit shorted to Sensor or chassis ground
 
Fuel level sensing unit is damaged or the fuel tank is damaged
 
Instrument cluster problem
 

Trouble Code: P0463



Fuel Level Sensor No. 1 High Input

Possible Causes:



Fuel level sending unit signal circuit is open or is shorted to battery voltage
 
Fuel level Sensor ground circuit is open
 
Fuel level Sensor is damaged or the fuel tank is damaged
 
Instrument cluster is faulty
 
BCM or PCM has failed
 

Trouble Code: P0480



Low Speed (No.1) Fan Control Relay Circuit

Possible Causes:



Fan relay intermittent condition
 
Ground circuit is open
 
Fused B+ output circuit malfunction
 
Fan relay control circuit is open or shorted to battery voltage or ground
 
Fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0481



High Speed (No. 2) Fan Relay Control Circuit

Possible Causes:



HFAN relay power circuit is open from the relay to fused power
 
HFAN relay control circuit is open or shorted to chassis ground
 
Fan relay(s) failed
 
PCM has failed.
 

 
label.common.footer.alt.autozoneLogo