Question about 2008 Chevrolet Express

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My 2008 Chevy express van 25004.8L has a p code on the tranny that is saying tranny oil running hot and an O2 sensor but tranny place says I need rebuild to fix issue huh wtf?

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  • Chevrolet Master
  • 10,875 Answers

Just add a tranny cooler,if your tranny gives you problems like not shifting etc,then it needs a rebuild,,,,the tranny fluid running hot is normal and can be fixed with a tranny cooler kit, Derale Series 8000 Plate Fin Transmission Cooler Kit Barb Inlets Class III... ,its a van,it is going to get hot,get a kit and hook it up,and see the difference,replace all o2 sensors while you are at it,they are cheap and if 1 goes then the others will go,and then you only have to be under it one time,not a couple times,here is info i found;
Transmission coolers are not vehicle specific, but there are ones that are recommended for certain engine sizes. What I did was look up the recommended coolers for the 4.8 liter engine for the 2008 Silverado to get an idea of what we recommend for that engine size.

The most popular cooler for the 4.8 is the Derale Transmission Cooler, # D13502, and GM fitting, # D13035. The cooler is listed for a load of up to 3,500 pounds. Before deciding on a cooler though it will be a good idea to look at the dimensions, listed on the product page below the description, to determine the best place to mount the cooler in the engine compartment.

I have included a link to a video showing a typical installation and a link to our FAQ article on transmission coolers for you to view.

Engine oil coolers would also be beneficial to extend the life of oil lubricated parts. The kits work well and from the information that I have received from Derale in the past, any restricted flow is so minute that it may not even be able to be detected.

I recommend the Derale Tube-Fin Engine Oil Cooler Kit, # D15501. The adapter has a 2-3/4 inch o-ring diameter which is used on the vast majority of GM applications. It also has multiple threads to ensure proper thread size. Again, you will want to check the dimensions of the cooler and compare that to the space under the hood of your 2008 Chevy Express Van ahead of time.

Both the transmission cooler and oil cooler come with all the necessary hardware and parts for installation. Current pricing information is available on each of the product pages.

Posted on May 27, 2015

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6 Suggested Answers

6ya6ya

6ya staff

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Posted on Jan 02, 2017

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USfalcon

anwar alkhaldi

  • 197 Answers

SOURCE: 1998 Chevy s10 4 cylinder running rough

1- check there is spark come from spark wires
2- check the fire timing by looking for every wire in the right place
3- check there is injector signl
4- check for any vacuom leak
5- try to clean the MAF by brake and parts cleaner
6- try to reset all the code and see what will come after that

Posted on Mar 14, 2009

CMV9

Cameron Viseth

  • 594 Answers

SOURCE: Pulled code p0420 on 99 chevy astro, 2wd, v6

from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

causes

A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
possible soloutions

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


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Posted on Aug 20, 2009

joyellowhors

  • 303 Answers

SOURCE: 2000 chevy express 1500 van having starting issues

Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor

Posted on Feb 04, 2010

Jonah Oneal

  • 14092 Answers

SOURCE: I need the serpentine belt diagram for a chevy Express Van

DRIVE BELT DECAL SHOULD BE UNDER THE HOOD.OR YOU CAN GO TO DEALERSHIP GET ONE AUTO ZONE OR ADVANCE AUTO PARTS CAN GET YOU ONE.OR YOU CAN BUY A HAYNES REPAIR MANUAL IT HAS BELT DIAGRAM.

Posted on Mar 10, 2010

spectre459

  • 1 Answer

SOURCE: Check engine light lit. P0894 or P0984 error code.

Fixed error code P0894 - They replaced torque
convertor, solenoid, filter and did a flush.

Posted on Apr 04, 2011

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My check engine light comes on . it read that my oxygen senseor or is it my cat-convertor?.is it regular problem with these chevy cargo van 2004 express


Depends on what the code was.If it is a po420 then it is the converter.I need to know what the code is.It could also be intake gaskets or just a bad o2 sensor.Let me know the code and I can help you find out what it is.Good luck.

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Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.

I do not believe that it is a problem with a valve/head gasket or cam.

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I have a Chevy 2002 express cargo van and the code indicated that the O2 sensor Bank2 sensor 1 is not working. Which one is this I see three sensors on the exhaust


HI....
The BANK 2 on your chevy is the PASSANGER SIDE.
And BANK 1 is at the DRIVER SIDE.
The sensor 1 is the UP sensor. It's mean BEFORE catalystic.
And the sensor 2 IS AFTER Catalystic.

OK... I hope this help on your question
Thank you for use fixya.

Jul 24, 2008 | Chevrolet Chevy Cars & Trucks

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