Code P0442

SETH FERGUSON

MEMBER
1999 DODGE RAM
5.9L
V8
4WD
AUTOMATIC
215,194 MILES

So I bought a truck (1500 Sport) unknowing that the check engine light was on and so far have spent around $800, 00 in diagnostics tools, and parts to try and figure out what is wrong. As a college student, that's not something I can keep doing. Originally I was getting a large emissions leak error but fixed that by replacing the EVAP canister and solenoid. I am now getting a small emissions leak error (P0442). I took it to another mechanic for a smoke test and they said it was the fuel pump. So far I have replaced my fuel pump, gas cap, EVAP canister, and solenoid. I have cleared the codes and they keep coming back after every fix. There seem to be no problems with the overall performance of the vehicle but it does occasionally rumble while idling. Kind of stuck between a rock and a hard place with this truck so any info can help.

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

I'm not sure how the fuel pump would cause a small EVAP leak.

Do me a favor. Check the fuel filler tube between the fuel tank and the side of the bed for rust. Also, and don't laugh, check to see if there is any corrosion or rust on the filler where the fuel cap is attached.

Here is the diagnostic flow chart for the code. It does require a scan tool that can actuate components. The attached pics correlate with these directions.

_____________________

1999 Dodge or Ram Truck RAM 1500 Truck 4WD V8-5.9L VIN Z LDC
P0442
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0442
P0442
Tests 846 - 848

see pic 1

Tests 849 - 850

see pic 2

SYMPTOM
P-0442 EVAP LEAK MONITOR SMALL LEAK DETECTED

WHEN MONITORED
Immediately after a cold start, with ambient temperature between 40 degrees F and 90 degrees F and coolant temperature within 10 degrees F of ambient temperature.

SET CONDITION
If there is a leak larger than 0.040" and smaller than 0.080" in the evaporative system.

POSSIBLE CAUSES
- Evap system hoses or wiring damaged
- Evap system component leaking
- Leak detection pump leaking
- Evap leak monitor small or large does not reoccur

____________________

Let me know what you find or if you have other questions.

Take care,
Joe

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Saturday, October 31st, 2020 AT 8:29 PM

SETH FERGUSON

MEMBER
2 POSTS

So I looked and I didn’t see any rust or damage, I also checked the hose but it looks in good condition as well. I was taking pictures to show and while doing so noticed that there is a small amount of rust. Do you think it’s enough to cause a code to pop up?

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