PIP5168F

Bulletin No.: PIP5168F
Published date: 01/16/2018
Preliminary Information
PIP5168F Crank No Start - Inspect for Sheared Cam Pin
Models
Brand:
Cadillac
Model:
Escalade
Model Years:
VIN:
from to
Engine:
Transmissions:
2015 - 2018
All
All 6.2L, L86
All
Chevrolet Camaro
2009 - 2018
All
All 6.2L, LS3, LT1, LT4
All
Chevrolet Corvette
2009 - 2018
All
All 6.2L, LT1, LT4
All
Chevrolet Express
2009 - 2018
All
All 4.8L, L20, 5.3L, LMF, 6.0L, L96, LC8
All
Chevrolet Silverado
2009 - 2018
All
All 4.3L, LV3, 4.8L L20, 5.3L L83, LMF, LMG, LY2, LY5, LY6
All
Chevrolet Silverado HD
2015 - 2018
All
All 6.0L, L96, LC8
All
Chevrolet Suburban
2015 - 2018
All
All 5.3L, L83, LMG
All
Chevrolet Tahoe
2002 - 2018
All
All 5.3L, L83, LMG
All
Chevrolet SS
2015 - 2017
All
All 6.2L LS3
All
Chevrolet MD (LCF)
2016 - 2018
All
All 6.0L, L96, LC8
All
GMC
Savana
2009 - 2018
All
All 4.8L, L20, 5.3L, LMF, 6.0L, L96, LC8
All
GMC
Sierra
2009 - 2018
All
All 4.3L, LV3, 4.8L L20, 5.3L L83, LMF, LMG, LY2, LY5, LY6, 6.2L, L86 All
GMC
Sierra HD
2015 - 2018
All
All 6.0L, L96, LC8
All
GMC
Yukon Models 2009 - 2018
All
All 5.3, L83, LMG, 6.2L, L86
All
Supersession Statement
This PI was superseded to add 2017 and 2018 model year and add the Cadillac Escalade andMD LCF trucks. Please discard
PIP5168E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
On rare occasions, a crank no start may be encountered on a cast iron V8 engine. Typically when this occurs, it is generally when the
vehicle still has low mileage, possibly during the Pre-Delivery inspection.
During diagnosis, the technician will find proper fuel pressure, spark from each spark plug wire, and proper injector pulse. However,
the following concerns will be noted during their diagnosis: low static compression, excessive cylinder leakage past an intake or
exhaust valve, the engine may start but run poorly if the CMP sensor is disconnected, and/or the valve train may not move while
cranking the engine.
This concern may be the result of a sheared camshaft sprocket locating pin due to the camshaft seizing to the camshaft bearings at
one time.
Recommendations / Instructions
If this concern is encountered, the following suggestions should be performed as necessary:
1) Crank the engine while checking for movement in the valve train. This can be done by shining light down the oil fill tube on most
models. If the valve train appears to be moving normally while the crankshaft is turning, continue to step 2. But, If you determine valve
train is not moving while the crankshaft is turning, continue to step 4.
2) Disconnect the CMP sensor to see if the engine will start. If the engine starts, continue to step 4.
3) Perform the following SI diagnostic procedures as necessary:
- Engine Cranks But Does Not Run diagnosis in SI
- Engine Compression Test in SI (document results) - Cylinder Leakage Test in SI (document results)
If the SI procedures above isolate an engine mechanical concern (low compression; excessive cylinder leakage through the exhaust or
intake, any type of valve train damage, etc.), continue to step 4.
4) If you have completed steps 1, 2, or 3, remove the front cover to inspect for a sheared cam sprocket locator pin. Before removing the
front cover, follow the latest version of 09-06-04-026 to verify the ECM calibrations just in case engine replacement is necessary. If this
is a new dealer stock unit, it is not necessary to verify the ECM calibrations.
5) If have determined the cam sprocket locator pin has sheared, replace the engine assembly.
Warranty Information
The correction for this concern may be one of several repairs described above. For vehicles repaired under warranty, please use the
appropriate warranty labor operation based on the actual cause and repair.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved
without completing every step, the remaining steps do not need to be performed.
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