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GM Releases Fix For Chevy Silverado HD Diesel Engine Coolant Contamination Issue

General Motors has released an urgent service update for certain units of the 2024 Chevy Silverado HD which may have contamination in the engine coolant, requiring a coolant flush and replacement of the surge tank plus multiple hoses to remedy.

All affected units of the 2024 Chevy Silverado HD are equipped with the optional 6.6L V8 L5P turbodiesel Duramax engine developing 470 horsepower and 975 pound-feet of torque. Notably, some 2024 GMC Sierra HD units are also affected.

Side view of the 2024 Chevy Silverado HD.

Service update N232430450 instructs dealerships to apply the available fix whenever a customer brings a Chevy Silverado HD in for service or other reasons. Dealers are also instructed to inspect the potentially affected trucks in their inventory and apply the fix before delivering, selling, demonstrating or trading those pickups.

The fix is applied to affected Chevy Silverado HD units in two stages. In the first stage, the dealership service personnel carry out a visual inspection of the coolant fluid in the radiator surge tank. Contamination results in a visible “film of oily black substance floating on top of the coolant” per the service update.

Rear three quarters view of the 2024 Chevy Silverado HD.

Only once contamination of the Chevy Silverado HD coolant is confirmed visually by the presence of the black oily layer should the dealership order replacement parts. The surge tank, heater inlet and outlet hoses, radiator inlet and outlet hoses, surge tank inlet and outlet hoses, and the engine coolant air bleed hose and pipe will all need to be replaced during a second service visit once the parts are available.

The full coolant flush and coolant parts replacement requires 11 hours of labor on average. The remedy for this problem is available free of charge to the pickup’s current owner through the end of the affected vehicle’s New Vehicle Limited Warranty period.

Cockpit view of the 2024 Chevy Silverado HD.

As a reminder, the 2024 Silverado HD rides on a more-capable variant of the GM T1 platform under the body panels. Production takes place at two facilities, specifically the GM Flint Assembly plant in Michigan and the GM Oshawa plant in Canada.

Comments

  1. Mary No Blame

    Update Recall Motors!

    Reply
  2. Mike mozz

    So what is the contamination? And what is bad about it? 11 hours labor…… dealers love it! Please explain issue of a little oil residue in cooling water.

    Reply
  3. Ken

    Replacing of all the hoses. So the hoses are defective or the oil is dissolving the hoses. Just more problems at gm!

    Reply
  4. Leonard

    Loose head bolts, no need to change hoses.

    Reply

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