#15-06-01-002D: Engine Misfire/Tick Noise, Malfunction Indicator Lamp (MIL) On, DTC P0300 Set - (Jul 11, 2016)

Subject: Engine Misfire/Tick Noise, Malfunction Indicator Lamp (MIL) On, DTC P0300 Set
Models: 2015-2016 Cadillac Escalade
2016 Cadillac CTS-V
2014 Chevrolet Silverado 1500
2014 - 2016 Chevrolet Corvette
2015 - 2016 Chevrolet Silverado, Suburban, Tahoe
2016 Chevrolet Camaro
2014 GMC Sierra 1500
2015 - 2016 GMC Sierra, Yukon, Yukon XL
Equipped with 5.3L Engine (RPO L83) or 6.2L Engine (RPO L86, LT1, LT4)
Attention: This Bulletin also applies to any of the above models that may be Export from North America vehicles.

This Bulletin has been revised to add a Note for Camshaft Inspection and update the Warranty information. Please discard Corporate Bulletin Number 15-06-01-002C.

Condition
Some customers may comment on a malfunction indicator lamp (MIL) on and/or an engine misfire/tick noise.
Technicians may find DTC P0300 set or in history.
Cause
This may be the result of an active fuel management (AFM) lifter that is mechanically collapsed and/or stuck all of the time.
This may be the result of internal locking pin damage in the lifter, due to oil aeration.
Correction
Note: Inspect the camshaft for damage while the lifters are removed from the engine. If damage is found, replace the camshaft per SI.

If SI diagnosis does not isolate the cause of this concern, technicians should inspect for valve operation.
If the valve(s) are not moving, replace the valve lifter oil manifold and affected bank of AFM lifters. Refer to Valve Lifter Oil Manifold Replacement and Valve Lifter Replacement in SI.
If the lifter has spun the bore, the guides should be replaced also.
Parts Information
Part Number Description
12660737 MANIFOLD ASM-VLV LFTR OIL (SERV KIT) (L83, L86, or LT1)
12660736 MANIFOLD ASM-VLV LFTR OIL (SERV KIT) (LT4)
12623104 GASKET-VLV LFTR OIL UPR MANIF
12645725 LIFTER ASM-VLV (AFM) (4 per Bank)
12659260 GASKET-CYL HD (6.2L)
12622325 GASKET-CYL HD (5.3L)
11546959 RIGHT SIDE CYLINDER HEAD BOLTS (10)
11611976 LEFT SIDE CYLINDER HEAD BOLT (1)
11546959 LEFT SIDE CYLINDER HEAD BOLTS (9)
12657093 GASKET-EXH MANIF
12626354 GASKET-INT MANIF (8)
12619787 GASKET-VLV RKR ARM CVR
12623308 GASKET-F/PMP BRKT
12618336 PIPE ASM-FUEL FEED INTER
12618337 PIPE ASM-FUEL FEED INTER
12618338 PIPE ASM-FUEL FEED
12668553 SEAL KIT-F/INJR (O RING) (2)