1. Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
2. Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
3. Raise the vehicle on a hoist. The vehicle must be level, with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle.

Warning: Refer to Checking Hot Transmission Fluid through Drain Plug Hole Warning in the Preface section.

4. Remove the transmission oil level control plug (65). Refer to the graphic at the beginning of this procedure.

Note: The transmission fluid may darken with normal use and does not always indicate contamination or oxidation.

5. Check the fluid color. If necessary, use a small screwdriver as a dipstick.

Is the fluid color clear red or light brown with no burnt odor?

At least 40°C (104°F)

Go to Step 4

Go to Step 2

Does the fluid have a burnt odor or a dark brown color?

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Go to Step 8

Go to Step 3

Does the fluid have a cloudy or milky appearance?

--

Go to Step 7

Go to Step 8

Check the fluid level. The fluid level should be even with the bottom of the threaded plug hole.

Is the fluid level low?

--

Go to Step 5

Go to Step 11

1. Remove the oil level control plug (65) and install DT 48890 fluid fill adapter .
2. Using DT 48890 fluid fill adapter and J 45096-30 flusher adapters or equivalent, add DEXRON®VI automatic transmission fluid in increments of 0.5 L (0.5 qt) until the fluid drains from the plug hole.

Did you add more than 1.5 L (1.6 qt) to the transmission?

--

Go to Step 6

Go to Step 11

The transmission may have a leak. Refer to Fluid Leak Diagnosis.

Was a transmission fluid leak found?

--

Go to Step 9

Go to Step 11

The transmission fluid is contaminated with engine coolant. Repair or replace the transmission cooler in the radiator.

Is the transmission cooler repair complete?

--

Go to Step 9

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1. Drain the fluid by removing the bottom pan.

Note: A very small amount of material in the bottom of the bottom pan is a normal condition.

2. Check the bottom pan for any excessive debris.

Was excessive debris found?

--

Go to Step 9

Go to Step 10

1. Repair the transmission if required. In some cases, overhaul may be required.
2. Flush the transmission oil cooler and pipes and check flow. Refer to Transmission Fluid Cooler Flushing and Flow Test.
3. Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
4. Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
5. Raise the vehicle on a hoist. The vehicle must be level, with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle.

Warning: Refer to Checking Hot Transmission Fluid through Drain Plug Hole Warning in the Preface section.

6. Remove the transmission plug.
7. Using DT 48890 fluid fill adapter and J 45096-30 flusher adapters or equivalent, add DEXRON®VI automatic transmission fluid in increments of 0.5 L (0.5 qt) until the fluid drains from the plug hole.

Caution: Refer to Fastener Caution in the Preface section.

Note: Before installing the fill plug (65), apply GM P/N 12345382 (Canadian P/N 10953489) to the thread of the line pressure plug.

8. Allow fluid to finish draining out of the plug hole. Remove DT 48890 fluid fill adapter . Install the plug (65) and tighten to specified value.
9. Wipe any excess fluid from the transmission with a rag or shop towel.

Is the repair complete?

At least 40°C (104°F)

12 N·m (9 lb ft)

System OK

--

1. Change the fluid and the fluid filter. Refer to Automatic Transmission Fluid Filter and Seal Replacement.
2. Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
3. Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
4. Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle.

Warning: Refer to Checking Hot Transmission Fluid through Drain Plug Hole Warning in the Preface section.

5. Remove the transmission plug (65).
6. Using DT 48890 fluid fill adapter and J 45096-30 flusher adapters or equivalent, add DEXRON®VI automatic transmission fluid in increments of 0.5 L (0.5 qt) until the fluid drains from the plug hole.

Caution: Refer to Fastener Caution in the Preface section.

Note: Before installing the fill plug (65), apply GM P/N 12345382 (Canadian P/N 10953489) to the thread of the line pressure plug.

7. Allow fluid to finish draining out of the plug hole. Remove DT 48890 fluid fill adapter . Install the plug (65) and tighten to specified value.
8. Wipe any excess fluid from the transmission with a rag or shop towel.

Is the repair complete?

At least 40°C (104°F)

12 N·m (9 lb ft)

System OK

--

Caution: Refer to Fastener Caution in the Preface section.

Note: Before installing the fill plug, apply GM P/N 12345382 (Canadian P/N 10953489) to the thread of the line pressure plug.

1. Allow fluid to finish draining out of the plug hole. Remove DT 48890 fluid fill adapter . Install the plug (65) and tighten to specified value.
2. Wipe any excess fluid from the transmission with a rag or shop towel.

Is the repair complete?

12 N·m (9 lb ft)

System OK

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