It may be (but is less likely) that the sun shell went bad as well. No Reverse– Most of the time reverse won’t engage when the clutches are worn out.
#Fuse ext2 sierra how to#
Here’s exactly how to find the 4L60E/4L80E fuse location. It doesn’t matter whether your 2004 Sierra has a 4L60E or 4L80E, the fuse will be in the same location. Either the wiring harness has a short or the transmission fuse is blown. Most of the time, limp mode is caused by loss of signal to/from the TCM. In either first or second gear, the torque converter slips more than it normally would on a takeoff. That makes taking off much better on the transmission. Another thing is, if you keep it in drive you’re only getting 3rd gear, but if you manually shift it into 2nd gear, it’ll go there. That’s because when entering limp mode the line pressure in the transmission is increased to its maximum pressure. Limp mode is designed to keep the transmission from hurting itself when it detects something is wrong.Ī couple of things to know about limp mode are that it’s not going to ruin your transmission to run it in limp mode, but it isn’t good for it either. No 1st and No Overdrive– When the truck has no overdrive and no first gear it’s almost certainly in limp mode. What to do When Your Transmission Light Comes On
#Fuse ext2 sierra code#
It really is worth noting that there doesn’t need to be a trouble code thrown for there to be a code in the computer. AutoZone, or any other parts store will be able to help you with this for free.
Or, you can go to any of the troubleshooting guides for these transmissions:ĤL80E Transmission Problems– This transmission came in some of the heavier duty HD truck models.ĤL60E Transmission Problems– The 4L60E was far and away the most common transmission that came in these trucks.Ĭheck Engine Light– Before doing any serious work, if you have a check engine soon light, go ahead and have it scanned to see what trouble codes it is throwing out. The NV3500 is a lot simpler piece of machinery. Most of the advice and information is applicable to the two automatic transmissions that came in almost all these trucks. This section is being presented to you as a top-level troubleshooting guide, to help you determine what’s wrong with your 2004 Sierra’s transmission, and what is needed to fix it. MT1– This is the 4L80E automatic transmission.It’s a four speed overdrive transmission. M30– This is the 4L60E automatic transmission.
#Fuse ext2 sierra manual#
It’s the only manual available for the 2004 Sierra. MG5– This is the NV3500 manual transmission.The transmission options that were available to the 2004 Sierra were as follows: It’s important to know which transmission came is in your Sierra. is a great resource to lookup all the codes for your Sierra. You’ll find everything you’d want to know about the options on your truck from this list. The RPO codes are a list of production options that are printed u p and stuck in your trucks inner glove compartment when it’s produced.
The easiest and quickest way to go about determining this is by RPO codes. The 2004 Sierra was a carryover from the 2003 model year.įirst and foremost, it’s necessary to determine what kind of transmission is in the truck. Below, you’ll find a ton of troubleshooting your transmission problems. Now, these trucks are getting older, and it’s very likely that your 2004 Sierra may be having transmission problems. The 2004 GMC Sierra was the 6th year of the GMT800 platform truck.
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