http://www.wellsve.com/ A small leak the an EVAP system can be extremely frustrating to find to say the least. This one was no exception to the rule. Not onl…
P0440 Diagnostics on a 2000 Pontiac Grand Am by Wells Vehicle Electronics
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2000, Diagnostics., Electronics, Grand, P0440, Pontiac, vehicle, wells
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The most common cause for a P0440 on your vehicle is a defective fuel cap.
Hope this helps,
Mark Hicks
Wells Vehicle Electronics
This seems to be somewhat of a common problem with GM vehicles. I have the exact issue with my 2000 Saturn SL1. Very frustrating.
so what was wrong with the car?I couldnt understand him during last few minates of the video
Pero el solo contestar lo compensa, keep going!
ok gracias amigo mark eso are checare la presion muchas gracias saludos desde alabama
Revise la presión de la línea de transmisión con el coche al ralentí en el parque, luego en coche.
En caso de tener cerca de 60-70 PSI.
Revise la presión de la línea de transmisión con la manguera de la aspiradora modulador.
Ahora debe tener más de 150 PSI.
Parece que la transmisión puede necesitar ser reconstruido.
Mark Hicks
Wells Vehicle Electronics
mi amigo mark tu español es muy bueno te felicito….amigo personas como tu se aprecian mucho
gracias amigo mark pero no no es el motor. es la transmission cuando presiono el freno se pone neutro por unos 5 o 6 segundos y despues da un golpe. de hay regresa a funcionar y de hay asta cuando vuelvo a frenar se vuelve a fallar la transmission
Por favor, mi español es muy pobre. Creo que usted está diciendo que el motor se para al acelerar. La primera parte me gustaría comprobar es el sensor de posición del acelerador.
Mark Hicks
Wells Vehicle Electronics
hola mark espero y me puedas ayudar con un problema de mi carro es un pontiac grand am 95 v6. lo que pasa es que cuando enfreno se corta la velocidad y tarda unos segundos en en volver la velocidad y ya de hay solo aveces e presenta el mismo problema en ocaciones cuando enfreno. bueno eso es el problema amigo mark saludos
Excellent! Thanks for the update.
Mark Hicks
Wells Vehicle Electronics
Evap hose on the top of the gas tank had a huge split in it. As soon as did the smoke test, smoke went everywhere out of that one hose. Replaced it, cleared the code. I’m confident that was the issue lol. Thanks again for posting this video!
All right, will do. Thanks for the reply!
Thank you! Please let me and everyone else know what you find. If you have any questions let me know.
Mark Hicks
Wells Vehicle Electronics
Hmm, my car is doing the whol P0440 thing and isn’t running right at all. I will look into this.. Great video, thanks for the post!!
Hi Mark 04 GMC canyon with po601 the truck start and run okay them stall and set code po601, the Michell 1 it’s not helping me really much can you give a hand on this one? I going to check power and ground at the BCM.
Please let me know if problem is the IPDM or not. Best of luck to you. Unfortunately, I don’t know how to diagnose it without a scan tool.
Mark Hicks
Wells Vehicle Electronics
yep the bad thing is don’t have a scan tool and I can’t energizer the relay manually but I hope the IPDM is bad.
The light switch inputs to the Body Control Module (BCM), and the BCM need to communicate on Controller Area Network (CAN) with the CPU inside the IPDM to tell the CPU to ground the tail light relay. There is an auto active test of the IPDM that can performed to determine if the IPDM is capable of turning the tail light relay on. The auto active test should operate the tail light relay without the need of the request on CAN from the BCM.
Mark Hicks
Wells Vehicle Electronics
The tail light relay and the tail light fuses are in the Intelligent Power Distribution Module (IPDM). The IPDM is the under-hood fuse/relay box. There is a Central Processing Unit (CPU) inside the IPDM that controls the ground for the tail light relay. The light switch inputs to the Body Control Module (BCM), and the BCM need to communicate on Controller Area Network (CAN) with the CPU inside the IPDM to tell the CPU to ground the tail light relay.
1. See if the scan tool can get into the IPDM to see if it shows tail lights on.
2. Perform the auto active test of the IPDM and see if the IPDM is capable of turning the tail light relay on.
Hi Mark a question you may can help me 10 Nissan altima, no tail light here how they work:
when the switch is in 1ST position BCM detects and send request to IPDM them IPDM activates the tail lamp relay which send power to fuses for tail lights, 2 V from BCM signal which never change at 1ST position but increase at 2ND position for headlight, how to know if the BCM it’s bad since there no activity voltage.
Hey Will Thanks for the great comment. Love your latest Snap-on give away video. Very creative!!! Keep up the great work!
Mark Hicks
Wells Vehicle Electronics
Great repair as always, Man them small EVAP leaks can be a Big pain, can drive you nuts at times. smoke machine is almost a must for this. thanks for sharing
You are right! This hurt was tougher to pinpoint than the video really shows. It doesn’t us scratching our heads for most of the diagnosis.
Mark Hicks
Wells Vehicle Electronics
Ah yes, the big P0440. GM’s equivalent of somebody sayin they’re hurtin and you ask them where they’re hurtin at, they say they’re just hurtin.
You are absolutely right. Come to think of it I don’t recall a single time I have heard or run into a situation when the PCM has set a false primary code in late model vehicles.
Thank you for your comment and insight!
Mark Hicks
Wells Vehicle Electronics
Excellent info. The video also shows well that the ECU knows there is something wrong although there at first seems to be nothing wrong with the system.
opps thanks will do.
Mark Hicks
Wells Vehicle Electronics
You might wanna redo your video description. P0404 is an EGR code, and the actual video is about an EVAP problem.