• Tiny
  • jsaenz25
  • 2005 Cadillac CTS
  • 6 CYL
  • 2WD
  • 91,000 miles

Refill trans fluid in a 2005 cts

Do you
have the same problem?
Saturday, February 12th, 2011 AT 12:55 AM

1 Reply

  • Tiny
  • factoryjack
  • Expert
  • 4,262 posts

There is a fill plug on the side of the trans, at the left rear side. Here is the checking/filling procedure.


NOTE: It is not necessary to check the transmission fluid level. A transmission fluid leak is the only reason for fluid loss. If a leak occurs have it repaired as soon as possible.

Start the engine and allow the engine to idle until the transmission fluid normal operating temperature has been reached.
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.
Raise the vehicle on a hoist. The vehicle must be level, with the engine running and the shift lever in the PARK range.
CAUTION: The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.

Remove the transmission plug (36).
IMPORTANT: The transmission fluid may darken with normal use and does not always indicate contamination or oxidation.

Check the fluid level. The fluid level should be even with the bottom of the threaded plug hole.
Add DEXRON III automatic transmission fluid in increments of 0.5 liters until the fluid drains from the plug hole.

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Saturday, February 19th, 2011 AT 7:43 AM

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