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 Diagnostic Hint for Crank or No Start in GM Vehicles

2016-2019 Cadillac CTS

2015-2020 Cadillac Escalade

2016-2019 Chevrolet 3500/4500 Medium Duty (LCF)

2016-2020 Chevrolet Camaro

2014-2019 Chevrolet Corvette

2011-2020 Chevrolet Express

2019-2020 Chevrolet Silverado

2015-2020 Chevrolet Suburban

2015-2020 Chevrolet Tahoe

2011-2020 GMC Savana

2010-2020 GMC Sierra

2015-2020 GMC Yukon

Condition:

There could be a concern that the vehicle cranks however do not begin.

Cause:

This condition could also be caused by a sheared rotating shaft sprocket locating pin.

The camshaft might seize the camshaft bearings just once throughout engine operation.

On rare occasions, a crank with no start may be encountered.

Correction:

During diagnosis, the technician can notice correct fuel pressure, spark from every electrical device wire, and proper contrivance pulse. However, the subsequent issues are going to be noted during their diagnosis:

Low static compression

Excessive cylinder escape past an intake or exhaust valve

The engine might start, however, runs poorly if the CMP sensing element is disconnected

The valve train might not move whereas cranking the engine this concern is encountered, see the Service Procedure below and perform the instructed steps as necessary.

Service Procedure:

Service Procedure1. Crank the engine while checking for movement within the valve train. Note: this may be done by shining lightweight down the oil fill tube on most models.• If the valve train seems to be moving usually while the shaft is turning, still step 2.• If you establish valve train isn't moving whereas the shaft is turning, move ahead to step 4.2. Disconnect the CMP sensing element to visualize if the engine can start. If the engine starts, move ahead to step 4.3. Perform the subsequent SI diagnostic procedures as necessary:3.1. Engine Cranks however don't Run diagnosis.3.2. Engine Compression check (document results).3.3. Cylinder escape check (document results).⇒ If the SI procedures are higher than isolating an engine mechanical concern (low compression; excessive cylinder leakage through the exhaust or intake, any kind of valve train damage, etc.), still step 4.Note: Before removing the front cover, verify the electronic warfare calibrations just in case engine replacement is necessary.4. when finishing steps 1, 2, or 3, take away the front cowl to examine for a sheared cam sprocket surveyor pin.⇒ If the cam sprocket locator pin has sheared, engine replacement is needed