Parts for your 2009 Holden Colorado-Transmission filter

2009 Holden Colorado transmission filter: what it is, whether it’s fitted, and how to look after it

Based on technical references including the Holden RC Colorado workshop manual (2008–2012), ACDelco/GM parts catalogues for the 4L60E automatic, Aisin AW30-40LE service literature, and Australian application guides from Ryco and Wesfil (which list pan filter kits for RC Colorado automatics), a transmission filter is fitted to 2009 Holden Colorado models with the 4-speed automatic gearbox. Manual gearboxes in the same model year don’t use a transmission filter, they rely on gear oil and a magnetic drain plug to catch particles.

On the auto utes, the transmission filter (often called a pan filter or strainer) sits inside the transmission sump. Its job is to trap clutch material and fine metal debris so the valve body and solenoids get clean fluid. Keeping that filter in good nick helps maintain crisp shifts, reduces wear, and can extend the life of the transmission—especially important for vehicles that tow, see dusty worksites, or do a lot of stop–start city running.

For servicing, most Australian and New Zealand parts catalogues list a filter-and-gasket kit for the 2009 Colorado auto (for example, Ryco and Wesfil kits), which aligns with the Holden and Aisin/GM documentation showing a serviceable internal filter. Good practice is to replace the filter whenever the transmission pan is removed, and to combine it with a fluid refresh. Severe-duty owners (towing, heavy loads, hot climates) commonly target 40,000–60,000 km, lighter-duty vehicles might stretch further, but many workshops recommend checking fluid condition each service and planning a filter and fluid service around 60,000–80,000 km.

Handy tips when replacing the filter:

• Use the ATF grade specified for the exact transmission variant. Many diesel RC auto boxes use a Dexron III–type fluid (Aisin AW30-40LE), while the 3.6 petrol with the GM 4L60E typically specifies Dexron VI. Always confirm on the under-bonnet label or owner’s manual.
• Fit a new pan gasket and the filter’s O-ring/seal, clean the magnet, and torque the pan bolts evenly to spec (low torque—don’t overtighten).
• Refill and set the fluid level at the correct temperature, on level ground, following the factory procedure.

Signs the filter and fluid are due include delayed or flared shifts, shudder on take-off, or dark, burnt-smelling ATF. If the vehicle is a 5-speed manual, there’s no transmission filter to replace—just schedule periodic gear oil changes and inspect the magnetic plug for swarf.

• Do all 2009 Holden Colorados have a transmission filter?
  Only the automatic versions do. Manuals don’t use a transmission filter, they use gear oil and a magnetic drain plug for particle capture.
• How often should the auto transmission filter be changed?
  Many workshops recommend around 60,000–80,000 km in normal service, or closer to 40,000–60,000 km for severe duty. Always base intervals on fluid condition and the factory schedule.
• Which ATF should be used?
  It depends on the exact box. Diesel autos commonly take a Dexron III–type fluid (Aisin AW30-40LE), while the 3.6 petrol with GM’s 4L60E generally specifies Dexron VI. Check the owner’s manual or the transmission ID label to be sure.