TSB's

Mixed Up Coils?

Several GM vehicle models may feature two distinctively different-looking per-cylinder valve-cover-mounted ignition coils. This is due to a supplier difference and, according to GM, does not affect performance or serviceability.

Replacement of coils is not necessary. If the customer wants to keep them looking the same appearance-wise, replace with the part number of either style.

Affected vehicles may include 2016-2019 Cadillac CTS, 2015-2019 Cadillac Escalade, 2016-2019 Camaro, 2014-2019 Corvette, 2014-2019 Chevy Express and Silverado, 2015-2019 Chevy Suburban and Tahoe, 2014-2019 GMC Savana and Sierra and 2-15-2019 GMC Yukon.

Affected engines include L88, L96, L83, L82, L84, L86, L87, Lt1, Lt4, Lt5, LV3 and LV1.

The ignition coil at the left is made by Delphi. The coil at right is made by Melco. They function the same, but feature different appearance.
<p>The ignition coil at the left is made by Delphi. The coil at right is made by Melco. They function the same, but feature different appearance.</p>

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