GM has a message for owners of V8-powered trucks and full-size SUVs: that ticking noises from the engine bay at idle don’t require any action. The automaker recently notified dealers that a ticking, knocking, or “typing” sound on 2019-2026 models equipped with the 5.3L V8 L84, 6.2L V8 L87, or 6.6L V8 L8T engine indicates normal operation. Affected vehicles include the Chevy Silverado 1500 and 2500HD/3500HD, Tahoe, Suburban, GMC Sierra 1500 and 2500HD/3500HD, Yukon, and Cadillac Escalade.
The noise most often occurs when the engine oil is cold after a long soak. It may last up to ten minutes before fading. The frequency varies with engine speed and from one vehicle to another. Owners will find the tick most audibly from the front wheel well area, although it can be found near the transmission bell housing or oil pan. “This sound does not indicate a mechanical failure,” states GM service bulletin 26-NA-021. “This is just a normal operating characteristic of this V8 engine.” The company added that the tick has no short-term or long-term effect on performance, reliability or durability. Dealers may not perform diagnostic or repair procedures for this condition.
GM’s guide comes amid a separate issue for the 6.2L V8 L87. Federal investigators continue to investigate post-recall engine failures, and the L87 is still in the midst of a recall campaign. These unrelated endurance headaches don’t change decisions on idle ticks. Owners simply hearing the rhythm of a typewriter at a traffic light can put their minds – and their wrenches – at ease.
