2004 Jeep Grand Cherokee - Inline 6 - Error Code P0442

Some are easy fixes (O2 sensor), the fuel vapour ones need a bit of investigation, as does the Neutral Safety Switch..

P0135 JEEP Code - O2 Sensor Heater Circuit Malfunction ...

https://www.engine-codes.com > p0135_jeep
'P0135 JEEP code possible causes · Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 · Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse · Heated Oxygen ...

P0455 JEEP Code EVAP System Large Leak (With Video)

https://www.autocodes.com > p0455_jeep
May 30, 2020 - 'P0455 JEEP code tech notes ... The P0455 it's very common code because the code is set if the gas cap is loose or missing. Start by tightening ...

P0442 JEEP Code Evaporative Emission Control Small Leak ...

https://www.autocodes.com > p0442_jeep
May 30, 2020 - The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the ...

P1899 JEEP Code - Park/Neutral Switch Circuit Conditions

https://www.engine-codes.com > p1899_jeep
'P1899 JEEP code possible causes · Faulty Park/Neutral Switch · Park/Neutral Switch harness is open or shorted · Park/Neutral Switch circuit poor electrical ...

Po442 is evap system leak
check intake and all vacuum hoses for leaks
check evap canister and purge valve
Po445 is evap canister purge valve short circuit
check wiring and connection

Change O2 sensor bank 1 sensor 1,front sensor.131,po442 check gas cap or replace and reset.

OBD code P0442 Small EVAP leak detected you may need to check the EVAP canister under the vehicle and the purge valve as well check for cracks on the canister or the purge valve and check all the rubber hoses connected to them foe cracks or holes. If you find any damage parts replace them. P0455 which means a large EVAP leak is sometimes referred as the gas cap leak check your gas cap and secure it tight if you still have the code change the gas cap hope this helps after you find and fix the problems get the vehicle to a shop and they will use an OBD scan tool to clear the codes.

p0455-- emission control system ( a large leak ) the most common cause is a bad seal on fuel cap, remove and replace cap, if light stats on. replace cap. if not the cap it could be any where in emission system. p0442 is--same as above. Code p0442 indicates a fuel vapor leak in the EVAP control system. To fix this problem, remove and reinstall the gas cap. Clear the codes and drive to see if the codes reappear. If the code appears again replace the gas cap or inspect the system for cuts or holes in the tube or hose. good-day !

P0442 (M)
Evaporative Emission Control System Leak Detected (medium leak)
A 0.040 leak has been detected in the evaporative system. (A faulty gas cap may cause this code). Also see TSB 25-001-02A. Note: The respective Powertrain Diagnostic Procedures Manual will direct the technician to determine if the vehicle evaporative system has an external system leak. Examples of some external system leaks are: a loose gas cap, a disconnected evaporative system hose, or a loose hose connection. Remember that the evaporative system may also have an internal system leak. This internal leak may be caused by an intermittent or permanently stuck open Duty Cycle Purge (DCP) valve. This leak source is considered to be internal because any escaping emissions enter into the engine system and not directly into the atmosphere, unlike an external leak. An internal leak may cause one of the above DTC?s. Possible causes of a stuck open (intermittent or permanent) DCP valve are: 1. Corrosion due to system moisture or possible water intrusion into the system

First off, if you have a 2004 Grand Cherokee with the 4.0 liter 6 cylinder engine, then it is an inline 6 rather than a V-6. To answer your question, it has a timing chain.

That code definition is (evaporative system small leak detected). One of the most common reasons for this code is a faulty gas cap. The evap system is strictly designed to trap fuel vapors in the tank and not allow them to scape into the atmosphere. The vehicle keeps a constant vacume on the tank and when it is unable to hold that pressure it will set the code you have. Try buying a new gas cap-thats a cheap start-clear the code and see what happens. If the light comes back on you will have to bring it to a repair shop where they will tap into the Evap system and force smoke into it. They will then observe the Evap hoses and wherever it leaks smoke will be your problem.

Yes it can be caused by low quality fuel, and your gas cap not being installed properly. Best bet is the gas cap, so take it off and screw it back on. Then take your vehicle to autozone and hook up diagnostics to clear your MIL.

Hello yeremya1776,

For Jeep Grand Cherokee, 1991-95 models:

Code 53 - Internal Controller Failure - Internal engine controller fault condition detected during self test

Hope this helps.

Remember: Good things come to those who Rate!!

Mike