How to check transmission fluid in Chevy Colorado?
Check the transmission fluid level on your Chevy Colorado using the transmission dipstick if your model has one, with the engine and transmission at operating temperature and the truck on level ground. If your Colorado uses a sealed transmission without a dipstick, level checks should be performed by a dealer or qualified mechanic.
Understanding your Colorado’s transmission setup
The Chevy Colorado has seen several transmission options across its generations. Many newer Colorados use a six-speed automatic (family 6L50/6L45) that typically requires Dexron VI or an equivalent GM-approved fluid, while some configurations offer a manual six-speed. Some model years also featured sealed transmissions without a user-accessible dipstick. Always consult the owner’s manual or a dealer for the exact process and fluid specification for your year and drivetrain.
Automatic transmission with a dipstick: how to check
Before you start, note that not every Colorado has a dipstick. If yours does, follow these steps to check level and fluid condition.
- Park on level ground and set the parking brake. Start the engine and bring the transmission up to operating temperature by driving for a short distance, then stop and idle.
- With the engine running and the transmission in Park, locate and pull out the dipstick from the transmission. Wipe it clean with a lint-free rag.
- Re-insert the dipstick fully, then pull it out again to read the level. The fluid should be within the marked “Full” or “Hot” guide depending on your dipstick’s labeling.
- If the fluid is low, add the correct Dexron VI (or the specification listed in your manual) in small amounts through the dipstick tube, rechecking the level until it’s within the proper range. Do not overfill.
- Examine the fluid’s color and smell. Fresh transmission fluid is reddish-pink and translucent. If it’s dark brown or has a burnt odor, it may need replacement or further inspection by a pro.
- Once the level is correct, reinstall the dipstick, run the engine, and recheck after a short drive to ensure there are no leaks and the level remains stable.
Properly checking the dipstick helps ensure the transmission has enough fluid for lubrication and cooling. If you notice persistent low readings or leaks, have the system inspected promptly.
What to do if your Colorado doesn’t have a dipstick (sealed transmission)
Some model years and trims use a sealed transmission without a user-accessible dipstick. For these, you cannot accurately check the fluid level yourself. If you suspect low fluid or notice shifting issues, schedule service with a Chevrolet dealer or qualified shop. They may perform a level check with specialized equipment and follow GM procedures to verify fluid condition and level.
Manual transmission: how to check (if equipped)
For Colorado models with a manual transmission, the process differs: there is usually a fill plug on the side of the transmission case rather than a dipstick. Check the level when the vehicle is on level ground and the engine is off, using the correct gear oil specified in the owner's manual.
- With the vehicle on level ground, chock wheels and lift if needed for access. Remove the fill plug on the side of the transmission.
- If oil begins to seep out at the bottom of the fill hole, the level is adequate. If not, add the recommended GL-4 gear oil (commonly 75W-90 or 80W-90) through the fill hole until it starts to seep out, then reinstall the plug and tighten to the specified torque.
- Wipe away any spilled fluid and store the plug securely. Recheck after a short drive to ensure there are no leaks.
Always refer to the manual for the exact gear oil specification and the correct service procedure for your year and transmission type.
Maintenance timing and fluid choices
Your vehicle’s owner’s manual provides the official maintenance intervals for transmission fluid inspection and replacement. General guidance often includes checking fluid level at regular intervals and replacing fluid based on mileage, towing duty, or severe driving conditions. Dexron VI or GM-approved equivalents are commonly specified for GM automatic transmissions in the Colorado. For manual transmissions, use the proper GL-4 gear oil as indicated by GM’s recommendations.
In any case, avoid cross-adding fluids from different manufacturers or mixing ATF with engine oil. If you’re uncertain about the correct product or procedure for your year, contact a Chevrolet dealer or a trusted repair shop.
Warning signs that transmission fluid needs attention
- Slipping or harsh, delayed, or erratic shifts
- Spurting or leaking fluid under the vehicle
- Discolored fluid (very dark or burnt smell)
- Overheating transmission temperature or warning lights
- Kettle-like noises or whining from the transmission area
If you notice any of these signs, have the transmission inspected promptly to prevent more serious damage.
Summary
Checking transmission fluid in a Chevy Colorado depends on whether your model uses a dipstick or is a sealed unit. For dipstick-equipped automatics, check level and fluid condition with the engine warm and the vehicle on level ground, adding Dexron VI as needed and avoiding overfill. For sealed transmissions, rely on dealer service with the proper equipment. Manual transmissions follow a separate fill-check procedure using the correct GL-4 gear oil. Always consult the owner’s manual for your exact year and configuration, and schedule professional service if in doubt. Regular checks help prevent transmission wear and potential failures.
