EVAP leak code PO455 and PO442

SUSIESLOW

MEMBER
2002 JEEP GRAND CHEROKEE
4.2L
V8
4WD
AUTOMATIC
190,000 MILES

It has a large leak and a small leak. Have replace gas cap. We did a smoke machine and the only smoke we saw was coming out the tail pipe.

Wednesday, June 26th, 2019 AT 8:58 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

Welcome to 2CarPros.

Here are some common fixes related to having both codes. Take a look through them and let me know if it helps. The attached pics correlate with these suggestions.

___________________________

MIL On, P0442, P0455, P0456, EVAP Leak Detected

ALLDATA Diagnostic Bulletin

RELATED VEHICLES: 2001-2004 Grand Cherokee. Related vehicles have similar information.

SUMMARY:
P0455 - EVAP Leak Monitor Large Leak Detected
P0442 - EVAP Monitor Medium (0.040) Leak Detected
P0456 - EVAP Monitor Small (0.020) Leak Detected
The Evaporative Leak Detection Monitor (vehicles equipped with an LDP system) requires a cold start, usually an overnight soak or parked for at least 8 hours without the engine running. The engine coolant temperature must be within 10 degrees of ambient/battery temperature, and the sensed Ambient (outside) Temperature must be between approximately 40° F and 90° F. For the monitor run conditions select the EVAP LDP MON PRE-TEST in the DRB III, OBD II Monitors Menu.

PROBABLE CAUSES:

EVAP System Hose/Line Leaks
Leak Detection Pump (LDP)
Fuel Filler Cap
EVAP Canister
EVAP Canister Vent Valve
DIAGNOSIS:

You Tube - Chrysler EVAP P0442 P0445 Smoke Diagnostics

1. Verify the fuel level is between 20% to 80% full and the gas cap is correct, and tight.
2. Disconnect the EVAP purge solenoid electrical connector. Pinch off the vent hose after the vent solenoid. Introduce smoke at the service port. Start the engine and test for smoke.
3. Perform a detailed visual inspection of the EVAP system hoses and lines. Especially the purge canister hose harness, at the rear of the vehicle, and the EVAP hoses inside the fender well area.
4. Repair or replace any leaking components.

Pic 1

Mileage Symptoms Test Performed
0 - 25,000

MILWarning Indicator Lamp On

None Indicated
Systems DTC Codes Keywords
Computers and Control Systems

P0442

P0455

P0456

None Indicated
Comment(0)
5 Repair(s) Available
Verified Repair(1)
05/19/2014 | 15:35:28
CORRECTION: Repair or replace leaking EVAP System Hose/Line.

SKILL LEVEL: B

LABOR TIME: 0.3 hrs.

COMPONENT LOCATION: The EVAP system hoses and lines are located in the engine compartment near the firewall, to the left rear bumper fascia area. The EVAP canister and Leak detection pump are located behind the left-rear wheel.

Pic 2

Let me know if that helps.

Joe

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