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The 2004 Chevy Silverado was the 6th model twelvemonth of the GMT800 platform truck.  These trucks are getting older, and it is hitting the point that your 2004 Silverado may exist having transmission problems.  Below, you'll find a ton of troubleshooting your transmission bug.  The 2004 Silverado was a carryover from the 2003 model yr.

Information technology is necessary to determine what kind of transmission is in the truck.  The easiest and quickest way to go about determining this is by RPO codes.  The RPO codes are a list of production options that are printed and stuck in your truck;southward inner glove compartment when it is manufactured.  Y'all'll discover everything you lot'd desire to know the options on your truck from this list.  RPOcodes.com is a great resource to lookup all the codes for your Silverado beyond the manual codes that are listed above.

The transmission options that were available to the 2004 Silverado were as follows:

• MG5–  This is the NV3500 manual manual.  It is the but transmission available for the 2004 Silverado.
• M32–  This will exist the 4L65E manual, which is an upgraded version of the 4L60E.
• M30–  This is the 4L60E automatic transmission.  It came in the lighter duty trucks.  It is a four speed overdrive manual.
• MT1–  This is the 4L80E automatic transmission.  It was used in Hard disk drive applications.
• MW7 or W74-Allison Transmission,  If you have a diesel Silverado there'south a high likelihood that y'all may have one of these two transmissions.  Here'south a whole department on Allison Transmission Issues.

Mutual 2004 Silverado Transmission Problems

This section is being presented to you as a top-level troubleshooting guide, to aid you determine what'south incorrect with your 2004 Silverado's manual, and what is needed to ready it.  Most of the advice and data is applicable to the two automatic transmissions that came in almost all these trucks.  The NV3500 is a lot simpler slice of mechanism.

Or, you can go to any of the troubleshooting guides for these transmissions:

4L80E Transmission Issues–  This transmission came in some of the heavier duty HD truck models.

4L60E Transmission Problems–  The 4L60E was far and away the most mutual manual that came in these trucks.

Cheque Engine Light–   Earlier doing any serious work, if you have a bank check engine presently calorie-free, get ahead and have it scanned to see what problem codes it is throwing out.  You lot might find the problem correct there.  AutoZone, or whatsoever other parts shop will be able to help you with this for costless.  It really is worth noting that there doesn't need to be a trouble lawmaking thrown for there to exist a code in the reckoner.

What to exercise When Your Transmission Light Comes On

No 1st and No Overdrive–  When the truck has no overdrive and no first gear information technology is about certainly in limp manner.  Limp mode is designed to keep the transmission from hurting itself when it detects something is wrong.

A couple of things to know nearly limp fashion are that information technology is not going to ruin your transmission to run information technology in limp style, but it isn't skilful for it either.  That's because when entering limp fashion the line pressure in the transmission is increased to its maximum pressure.  Another thing is, if yous keep it in drive you lot're only getting 3rd gear, but if yous manually shift it into 2nd gear, it'll go at that place.  That makes taking off much better on the manual.  In either first or second gear, the torque converter slips more it normally would on a takeoff.

Most of the time, limp mode is acquired by loss of indicate to/from the TCM.  Either the wiring harness has a short or the transmission fuse is blown.  It doesn't thing whether your 2004 Silverado has a 4L60E or 4L80E, the fuse volition be in the same location. We recommend starting there..  You might get lucky.

Hither's exactly how to find the 4L60E/4L80E fuse location.

No Contrary–  Virtually of the time contrary won't engage when the clutches are worn out.  It may be (but is less likely) that the sun shell went bad also.  There'southward a whole article on this site dedicated to diagnosing no opposite in the 4L60E.  It is pretty applicable to the 4L80E equally well.

Transmission Not Locking in Overdrive–  The 4L60E and 4L80E both accept torque converters that lock.  That is to say when they are moving at a certain speed, they'll lock and create a direct one:1 connexion between the engine and manual.  It removes all of the torque converters multiplication factor and increases drivetrain efficiency.

When the torque converter doesn't lock, it tin feel weird or jarring.  You'll go down the highway and the engine rpm will be college and it feels almost as if the manual is over reacting to what you are telling the gas pedal.

This is usually acquired past the lockup circuit declining.   There's a switch nether the brake pedal that works like a brake calorie-free switch that tells this circuit when information technology is time to activate.  Both sides will exist hot when it is working properly.

See besides:  4L60E No Overdrive Diagnosis

Not Moving in any Gear–  If your 2004 Silverado Manual has a problem moving in any gear, it is probable acquired by a lack of manual fluid.  No matter how light-headed that sounds, and how convinced you are that it is not the problem, become ahead and check it anyhow.  You should want this to be the problem.  It is way less expensive than replacing a bad torque converter.

Low Transmission Fluid Signs

Automated Transmission Wont Become in Gear- Troubleshooting

Good luck with your Silverado!

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Source: https://www.700r4transmissionhq.com/2004-chevy-silverado-transmission-problems/

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