I have the service engine soon light on. I had auto zone run a code check and it is the p0442 code. I checked the gas cap and the light is still on. What is the next step?
SOURCE: check engine light on - 2003 gmc envoy XL
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.
SOURCE: 2007 GMC Envoy - Gas gauge showing empty and check engine light
This is a safety feature that the vehicle brings. You need to reset the E.C.U on dealership or it will keep doing it to you. It was probably caused by one single time that you did not closed the fuel cap correctly. Good luck
SOURCE: I HAVE A 2007 GMC
DTC P0496 - Evaporative Emission (EVAP) System Flow During Non-Purge
If the EVAP purge valve does not seal properly, fuel vapors could
enter the engine at an undesired timing causing drivability concerns.
The control module tests for this by commanding the EVAP purge valve OFF
closed and vent valve ON closed, sealing the system, and monitoring the
FTP for an increase in vacuum. If the control module detects that Evap
system vacuum increases above a calibrated value, DTC P0496 will be set.
This could be a sign that your purge valve is intermittently failing
so you might want to get it checked out before it turns into a bigger
problem that affects the drivability of your truck.
EVAP is located behind the throttle body, near the front of the engine...
Fig. Front engine compartment view-4.8L, 5.3L, 6.0L and 6.2L
engines (1) Throttle Body (2) Manifold Absolute Pressure (MAP) Sensor
(3) Evaporative Emission (EVAP) Canister Purge Solenoid Valve (4) Knock
Sensor (KS) (5) Engine Block Heater (6) Engine Coolant Temperature (ECT)
Sensor (7) Camshaft Position (CMP) Sensor (8) Generator (click for zoom)
The first step would be to simply clean the valve and see if that helps.
The purge valve will be an inexpensive part (probably $20.00 or so) so
I'd usually just replace it instead of trying to test it to thoroughly.
I've found it can be a somewhat tough part to come by a third party
dealers (Napa, Autozone, etc.) So you might have to contact your local
GMC dealership parts department to buy the part.
The best thing to do would be to ask the person at the repair dept
who sells you the part to copy the page with the replacement guidelines
from the service manual. You usually won't have any trouble getting them
to do this and then you'll have a good written copy to follow while you
change the valve.
The other option would be to have a local mechanic do the replacement for you.
Hope helps.
SOURCE: I have a 2005 GMC CANYON and the check engine has
Theres is a way, you can do it with a scan tool or remove a battery connection for 5min, the check engine light can come on for many reasons, when the computer sees a problem with the engine sensors or trany that is out of specs it will turn on the light and store a codes in the computer, this codes will tell you what part of what system is failing, i would have the codes read to see what the problem is, this way you dont do any further damage, many autopart stores will scan the codes for free, i think you should get the code or codes and i will help you further, good luck and i hope this helps.
SOURCE: 2003 GMC Envoy Service Engine light on. OBD2 Code
Ah the famous P0128.....It's 1 of 2 things. If your fan is not engaged constantly (would sound like an airplane or big rig everytime you step on the gas) and is working properly, that rules out the fan clutch. The other common problem is the thermostat. Replace the thermostat and the code will go away. Engine temperature needs to be at 210 degrees on these engines. If the fan clutch is constantly engaged, it's cooling the engine off constantly and won't get up to 210 fast enough. If it's the thermostat, it's stuck open and isn't allowing the coolant to properly heat up in time.
Hello
When the service engine
soon light a yellow light (Also called the check engine light or
engine management light) is turned on this is to alert you to the
fact that Powertrain Control Module (computer) has detected a
failure somewhere in the systems it controls you may not feel any
difference in the way the engine runs, this can be the transmission
or the engine or emission system, there are fault codes set in the
modules memory for these faults. What needs to happen now is to have
the powertrain control module scanned with a special tool called an
OBD2 electronic engine control scanner or a OBD2 code reader. Once
the code(s) are read then you must perform the diagnostics for each
code and make the appropriate repairs based on the findings of the
diagnosis that was performed, this is called doing "Pinpoint"
testing.
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