NHTSA ID Number: 10249994
Manufacturer Communication Number: PIP5395H
TSB/Document Date: 2024-02-12
Summary
This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicles that may have rattle or ticking noise that is louder inside the vehicle than outside. The noise may also sound like a lifter tick. If the noise is heard best at the fuel line and the sound will be real loud with a stethoscope. The fuel line will need to be replaced.
Bulletin No.: PIP5395H
Published date: 01/24/2024
Preliminary Information
PIP5395H Ticking Rattle Or Buzz Noise Heard The Best In The
Passenger Compartment
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
CTS-V
2016 - 2018
All
All
6.2L LT4
All
Escalade
2015 - 2018
All
All
6.2L L86
All
Camaro
2016 - 2023
All
All
6.2L LT1
All
Corvette
2014 - 2018
All
All
6.2L LT1 LT4
All
Silverado
2014 - 2018
All
All
4.3L 5.3L 6.2L L83 L86 LV3
All
Suburban
2015 - 2018
All
All
5.3L L83
All
Tahoe
2015 - 2018
All
All
5.3L L83
All
Sierra
2014 - 2018
All
All
4.3L 5.3L 6.2L L83 L86 LV3
All
Yukon Modules
2015 - 2018
All
All
5.3L 6.2L L83 L86
All
Supersession Statement
This PI was superseded to update vehicle coverage. Please discard PIP5395G.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
A customer concern of rattle or ticking noise that is louder inside the vehicle than outside.
The noise may be picked up at the back of the left valve cover.
The noise may also sound like a lifter tick.
This may also be called a fuel line buzz or ringing noise.
Recommendations / Instructions
Listen to the fuel line connection at the left side of the engine.
If the noise is heard best at the fuel line (this sound will be real loud with a stethoscope).
The fuel feed line between the high pressure fuel pump and chassis fuel line could be the
cause allowing high pressure pulsation back to the low side of the fuel system. There is not a
good way to test the check valve, the line will need to be replaced.
On pickups and SUVs, a vibration in the fuel line at the fuel tank may also be observed.
There are two different fuel line types that contain this check valve and vary by model.
The line above is the fuel feed pipe for Corvette, truck and SUV.
This line connects the chassis fuel line to the high pressure fuel pump.
These pictures above shows the chassis fuel feed pipe for the LT4 supercharged ZL1 Camaro
(LT4 Camaro is now covered in 23-NA-207).
On LT1 Camaro and LT4 CTS-V this line would have a jumper line with quick disconnects at
both ends.
One end will connect to the chassis line and the other to the high pressure pump feed line.
Warranty Information
For vehicles repaired under the Emission coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
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.
© 2024 General Motors
. All Rights Reserved.
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TSB/Document ID: PIP5395H
Replacement Service Bulletin Number:
MFR Communication Date: 2024-01-24
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL SYSTEM, GASOLINE
MFR Component System:
MFR Component Subsystem:
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