Cadillac Escalade and CTS-V May Misfire/Tick

Oct. 12, 2020

 

This bulletin applies to 2015-2019 Cadillac Escalade and 2016-2019 CTS-V vehicles equipped with a 5.3L or 6.2L engine. Some customers may comment about a misfire/tick noise and the MIL on. The technician may find DTC P0300 set or in history.

This bulletin applies to 2015-2019 Cadillac Escalade and 2016-2019 CTS-V vehicles equipped with a 5.3L or 6.2L engine. Some customers may comment about a misfire/tick noise and the MIL on. The technician may find DTC P0300 set or in history.

This may be caused by one of the following:

  • Active fuel management (AFM) lifter that is mechanically collapsed and/or stuck all of the time.

  • Internal locking pin damage in the lifter due to oil aeration.

  • Lifter that has collapsed and is stuck in the lifter bore.

  • Bent pushrod

Inspect for camshaft damage while the lifters are removed. If damage is found, replace the camshaft. 

Inspect the valve operation. If the valve(s) are not moving, replace the lifter oil manifold and the affected bank of AFM lifters. If a lifter has spun in its bore, the lifter guides should also be replaced.

If a lifter was stuck in its bore, after lifter removal, be sure to inspect the lifter bore for damage. If a lifter bore is damaged, GM recommends that the block must be replaced.

Another option is to use a vise grip with a small pry bar. If the lifter cannot be removed, the engine block must be replaced. 

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of  specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

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