GM Service Manual Online
For 1990-2009 cars only

For more information, see "Automatic Transmission Fluid" in the owner manual.

Checking the Fluid Level


Object Number: 1386899  Size: B2

The vehicle's automatic transmission dipstick looks like this. For more information on location, see Engine Compartment Overview.

When to Check and Change Automatic Transmission Fluid

It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheating the transmission. If you suspect a small leak, then use the following checking procedures to check the fluid level. However, if there is a large leak, then it may be necessary to have the vehicle towed to a dealer/retailer service department and have it repaired before driving the vehicle further.

Notice: Use of the incorrect automatic transmission fluid may damage the vehicle, and the damages may not be covered by the vehicle's warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants .

Change the fluid and filter at the intervals listed in the Maintenance Schedule. See Scheduled Maintenance. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants.

How to Check Automatic Transmission Fluid

Notice: Too much or too little fluid can damage your transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Too little fluid could cause the transmission to overheat. Be sure to get an accurate reading if you check your transmission fluid.

Before checking the fluid level, prepare the vehicle as follows:

  1. Start the engine and park the vehicle on a level surface. Keep the engine running.
  2. Apply the parking brake and place the shift lever in P (Park).
  3. With your foot on the brake pedal, move the shift lever through each gear range, pausing for about three seconds in each range. Then, move the shift lever back to P (Park).
  4. Allow the engine to idle (500 - 800 rpm) for at least one minute. Slowly release the brake pedal.
  5. Keep the engine running and press the Trip/Fuel button or trip odometer reset stem until TRANS TEMP (Transmission Temperature) displays on the Driver Information Center (DIC).
  6. Using the TRANS TEMP reading, determine and perform the appropriate check procedure. If the TRANS TEMP reading is not within the required temperature ranges, allow the vehicle to cool, or operate the vehicle until the appropriate transmission fluid temperature is reached.

Cold Check Procedure

Use this procedure only as a reference to determine if the transmission has enough fluid to be operated safely until a hot check procedure can be made. The hot check procedure is the most accurate method to check the fluid level. Perform the hot check procedure at the first opportunity. Use this cold check procedure to check fluid level when the transmission temperature is between 80°F and 90°F (27°C and 32°C).


    Object Number: 806047  Size: A1

    Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle.

  1. See Engine Compartment Overview for more information.
  2. Flip the handle up and then pull out the dipstick and wipe it with a clean rag or paper towel.
  3. Install the dipstick by pushing it back in all the way, wait three seconds, and then pull it back out again.
  4. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the reading.

  5. Object Number: 1657470  Size: B2
  6. If the fluid level is below the COLD check band, add only enough fluid as necessary to bring the level into the COLD band. It does not take much fluid, generally less than one pint (0.5L). Do not overfill.
  7. Perform a hot check at the first opportunity after the transmission reaches a normal operating temperature between 160°F to 200°F (71°C to 93°C).
  8. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.

Hot Check Procedure

Use this procedure to check the transmission fluid level when the transmission fluid temperature is between 160°F and 200°F (71°C and 93°C).

The hot check is the most accurate method to check the fluid level. The hot check should be performed at the first opportunity in order to verify the cold check. The fluid level rises as fluid temperature increases, so it is important to ensure the transmission temperature is within range.


    Object Number: 806047  Size: A1

    Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle.

  1. See Engine Compartment Overview for more information.
  2. Flip the handle up and then pull out the dipstick and wipe it with a clean rag or paper towel.
  3. Install the dipstick by pushing it back in all the way, wait three seconds, and then pull it back out again.
  4. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the reading.

  5. Object Number: 1657470  Size: B2
  6. Safe operating level is within the HOT cross hatch band on the dipstick. If the fluid level is not within the HOT band, and the transmission temperature is between 160°F and 200°F (71°C and 93°C), add or drain fluid as necessary to bring the level into the HOT band. If the fluid level is low, add only enough fluid to bring the level into the HOT band. It does not take much fluid, generally less than one pint (0.5L). Do not overfill.
  7. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.

Consistency of Readings

Always check the fluid level at least twice using the procedures described. Consistency (repeatable readings) is important to maintaining proper fluid level. If fluid is added, it may take 15 minutes or longer to obtain an accurate reading because of residual fluid draining down the dipstick tube. If inconsistent readings persist, check the transmission breather to be sure it is clean and not clogged. If readings are still inconsistent, contact your dealer/retailer.