Question about 2003 GMC Envoy

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I have a 2004 Envoy. How can water get into transmission if radiator is ok and no flood driving?

I have a 2004 Envoy. The transmission stopped working with no advance notice. When taken apart, there is water and rust in the transmission. Radiator was checked and not faulty. I have not driven it through a flood. How else could water be inside of the transmission? Extended warrantee will not pay because of "contaminates" in the transmission. I am stumped how it happened.

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If radiator okay, water getting into transmission some how if you have not driven in no flood, have radiator shop check radiator doing a pressure test.

Posted on Dec 11, 2012

  • Jonah Oneal Dec 11, 2012

    need fix problem,because water will get in new rebuild transmission cause same problem.

  • tdeckberg
    tdeckberg Dec 11, 2012

    Thanks! The trans shop sent the radiator to a certified radiator shop that did 2 pressure tests on it. If it had been the radiator, warrantee might have covered at least part of it. This is through AAMCO, and have offered to put on a new radiator at cost only, because I was concerned about the problem happening again. Also keeping old radiator so that I can have it checked elsewhere for issues if I wanted to.


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There is a vent hose on the top of the transmission,and the hose is suppose to hook to the fire wall,but sometimes it falls down and water gets in the transmission

Posted on Dec 10, 2012

  • tdeckberg
    tdeckberg Dec 11, 2012

    Thank you! I will ask them to check this, but probably too late since they have tore down the trans already.


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Transmission fluid & oil absorb water thru atmosphere. regular maintenance schedules are in place for a reason. how many miles on trans & how often has fluid been changed ?

Posted on Oct 14, 2013

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Posted on Jan 02, 2017

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SOURCE: envoy 2004 idle speed

your problem seems very easy :) hope this one work with your envoy. Just buy AC DELCO carburetor tune-up conditioner.

How you use it: engine running , AC off please

1. detached the big black airflow hose which is attached in the mannifold of the engine block.

2. ask your friend to step on the gas pedal and set the rpm steady in 2000 rpm only.

3. then spray vigorously in 8 seconds the inside circle opening of mannifold while your friend steady step on gas pedal with steady 2000 RPM only.

4. after you spray, let your freind continue on gas pedal with 2000 rpm for 15 more seconds.

5. attached back the airflow big black hose to the manifold and you are ready to roll with your AC on.

if this one doesnt work, please scan your envoy by scanner called TECH II. and find out.

Posted on Jul 18, 2008

SOURCE: Instrument gauges in 2004 envoy

ours did this, it was the guage cluster that went bad. It's about $600 to replace

Posted on Nov 06, 2008

  • 341 Answers

SOURCE: Replace the thermostat on 2002 GMC Envoy

4.2L Engine the thermostat and the neck where the hose goes on is one unit $25 at autozone

  1. Remove the necessary coolant from the radiator.
  2. Remove the alternator, Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
  3. Remove the thermostat housing bolts.
  4. Remove the thermostat housing from the engine block.
  5. Clean all of the surfaces of the thermostat housing.
  6. Clean the sealing surface of the engine block.

Posted on Dec 29, 2008

  • 202 Answers

SOURCE: Envoy shaking when stop

p0128 engine coolant thermostat below operating temp. Possible low on antifreeze. not plugged in, possible chaffed wires.

P0106 pertains to the throttle body. most cases involve cleaning the throttle body

p0614 i could not find code definition

Posted on Aug 04, 2009

  • 50 Answers

SOURCE: My 2002 GMC Envoy transmission slips into neutral

try adding fluid and if still slipping neeed to have it checked could just need a fluid change

Posted on Oct 16, 2009

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My 2004 Envoy does not seem to shift right on the highway

With the limited information you provided, it would be a good idea to bring your Envoy to a transmission shop for analysis. Most general repair shops and even many dealers do not do this work because it is so specialized. Bringing it directly to a transmission shop yourself will save the "mark up" charged by general repair shops.

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Sometimes, low fluid level can be a source of the problem and other times a change of fluid can solve the problem - but not as often as one would hope. Check the fluid level on the dipstick. Add enough fluid to bring it to the correct level. The fluid should be pinkish/red in color, but will likely be darker if it has been in for a long time. Regardless of color, the fluid should not smell burnt. An improperly shifting / slipping transmission coupled with burnt smelling fluid is an indicator of a potential expensive transmission rebuild on the horizon.

Good luck!

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2004 gmc envoy code 0128

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