Holden Colorado: LWN 2.8L Diesel EGR Cooler Internal Failure – Coolant Contamination

The LWN 2.8L Duramax diesel used in the RG Colorado has an EGR cooler that is prone to internal cracking, allowing coolant to enter the EGR gas circuit. This contamination causes a distinctive white smoke from the exhaust under acceleration and progressive coolant loss. Continued operation leads to hydrolocking risk and potential engine damage. Holden Australia issued a recall and extended warranty coverage for this fault. One of the most commonly documented faults on the RG Colorado.

• White smoke from exhaust on acceleration, not present at idle warm
• Coolant loss without visible external leak
• Sweet smell from exhaust
• Low coolant warning light
• Milky or frothy residue on oil filler cap (advanced cases)

1. 1

   Check coolant reservoir level and look for top-up evidence.

2. 2

   Start cold and watch exhaust carefully on first acceleration run.

3. 3

   Check oil filler cap and dipstick for milky contamination.

4. 4

   Confirm whether recall work was completed using the VIN against Holden recall database.

Parts involved: EGR valve.

$1,800 to $4,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the EGR cooler recall or extended warranty repair been completed?”
• “Any white smoke from the exhaust?”
• “Any unexplained coolant loss?”
• “Has the engine oil been checked for contamination?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.