NHTSA ID Number: 10201323
Manufacturer Communication Number: PIP5817
Summary
This Preliminary information communicates to the dealers information related to a hot idle tick noise from the engine
. Testing to isolate the noise to the upper engine / valve train and repair recommendations related to valve train components.
2 Affected Products
Vehicles
Condition
Ticking or tapping noise from upper engine at hot idle.
Cause
Potential camshaft generated noise.
NOTE: While this noise may lead to customer dissatisfaction, it is not a durability issue.
Correction:
Some customers may have a concern of tick noise at hot idle from the upper engine.
This noise will occur at valve train speed, increase and decrease with RPM and may become louder as the engine temperature increases.
This concern will not cause engine misfires, and typically will not set system related DTC’s. With the engine at operating temperature, idle the engine to duplicate the tick noise.
Carefully place the tip of a stethoscope at the locations shown below to isolate the area of the noise.
Once the noise is isolated, remove the Camshaft Carrier Cover following all GSI procedures.
Do not replace Stationary Hydraulic Lash Adjusters or Roller Finger Followers unless damage or performance issues are confirmed.
Replace either the Intake Camshaft or Exhaust Camshaft based on the location of the noise isolated using the Stethoscope.
SEOCONTENT-START
Bulletin No.: PIP5817 Published date: N/A Preliminary Information PIP5817 Hot Idle Tick Noise from Engine Models Model Years: Chevrolet GMC Silverado 1500 (New Model) Sierra 1500 (New Model) 2021 2021 VIN: from to All All All All Engine: 2.7L (L3B) 2.7L (L3B) All All Transmissions: Involved Region or Country Condition Cause North America Ticking or tapping noise from upper engine at hot idle. Potential camshaft generated noise. NOTE: While this noise may lead to customer dissatisfaction, it is not a durability issue. Correction: Some customers may have a concern of tick noise at hot idle from the upper engine. This noise will occur at valve train speed, increase and decrease with RPM and may become louder as the engine temperature increases. This concern will not cause engine misfires, and typically will not set system related DTC’s. With the engine at operating temperature, idle the engine to duplicate the tick noise. Carefully place the tip of a stethoscope at the locations shown below to isolate the area of the noise. Once the noise is isolated, remove the Camshaft Carrier Cover following all GSI procedures. Do not replace Stationary Hydraulic Lash Adjusters or Roller Finger Followers unless damage or performance issues are confirmed. Replace either the Intake Camshaft or Exhaust Camshaft based on the location of the noise isolated using the Stethoscope. Version History Version 1 Modified 08/20/2021 – Created on.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5817
Published date: N/A
MC-10201323-9999.pdf 269.744KB
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