NHTSA ID Number: 10137883
Manufacturer Communication Number: PI1201A
Summary
This preliminary bulletin provides a procedure to replace the exhaust systems with a noisy PEV to correct a cutomers concern of the exhaust rattle, buzz, or pop.
2 Affected Products
Vehicles
Parts
| MUFFLER, EXH (W/EXH PIPE) | CK155 (43) 4.3 (LV3), 5.3-C (L83), CK157 (53) 4.3 (LV3) , 5.3-C (L83) | 20757703 |
| MUFFLER, EXH (W/EXH PIPE) | CK157 (03) 4.3 (LV3), 5.3-C (L83), 6–SPD AUTO TRANS (MYC) | 20757704 |
| MUFFLER, EXH (W/EXH PIPE) | CK157 (43) 4.3 (LV3), 5.3-C (L83) | 20757702 |
| MUFFLER, EXH (W/EXH PIPE) | CK159 (03) 4.3 (LV3), 5.3-C (L83) | 20757701 |
| MUFFLER, EXH (W/EXH PIPE) | CK157 (43) 6.2 (L86) | 23199937 |
| MUFFLER, EXH (W/EXH PIPE) | CK155 (43) 6.2 (L86), CK157 (53) 6.2 (L86) | 23440153 |
SEOCONTENT-START
Bulletin No.: PI1201A
Date: April, 2014
| Subject: | Exhaust Rattle, Buzz, Pop or Whistle |
| Models: | 2014 Chevrolet Silverado 1500 |
| 2014 GMC Sierra 1500 | |
| Equipped with 4.3L, 5.3L or 6.2L Engine (RPOs LV3, L83, L86) | |
| Built Prior to December 8, 2013 or Muffler Julian Date of 352 2 (See Below) |
This PI has been revised to add the 6.2L Engine. Please discard PI1201.
Condition/Concern #1
Some customers may comment on a rattle, buzz and/or pop (oil canning) noise heard coming from the exhaust system under different conditions.
Recommendation/Instructions #1
The correction of the muffler pop or oil canning noise will require the replacement of the cold end or back half of the exhaust system.
Note: The exhaust system rattle can also be diagnosed by tapping on the bottom of the muffler.
Condition/Concern #2
Some customers may comment on a whistle type noise that can be heard coming from the muffler area.
Recommendation/Instructions #2
- Temporarily lock the Passive Exhaust Valve (PEV) in the open position, located behind the muffler, as shown in the illustration above.
- Rotate the Passive Exhaust Valve (PEV) counterclockwise as shown in the illustration above.
- For testing purposes only, obtain a 1/4″ x 20 x 2” steel bolt, nut, lock washer and two large standard 1/4″ x 1” outside diameter washers (body washer), and install the bolt as shown in the illustration above.
- If the condition is reduced or changes greatly in severity, replace the exhaust system.
Condition/Concern #3
Some customers may comment on a vibration in the seat or steering wheel felt when the truck engages V4 mode (Active Fuel Management).
Recommendation/Instructions #3
- Verify the condition.
- Review exhaust system for Ground Outs at the mounts and repair as necessary.
- For testing purposes only, obtain a 1/4″ x 20 x 2” steel bolt, nut, lock washer, and two large standard 1/4″ x 1” outside diameter washers (body washer), and install the bolt as shown in the illustration above.
- If the condition is reduced or changes greatly in severity, replace the exhaust system.
Parts Information
| Description | Usage | Part Number |
| MUFFLER, EXH (W/EXH PIPE) | CK155 (43) 4.3 (LV3), 5.3-C (L83), CK157 (53) 4.3 (LV3) , 5.3-C (L83) | 20757703 |
| MUFFLER, EXH (W/EXH PIPE) | CK157 (03) 4.3 (LV3), 5.3-C (L83), 6–SPD AUTO TRANS (MYC) | 20757704 |
| MUFFLER, EXH (W/EXH PIPE) | CK157 (43) 4.3 (LV3), 5.3-C (L83) | 20757702 |
| MUFFLER, EXH (W/EXH PIPE) | CK159 (03) 4.3 (LV3), 5.3-C (L83) | 20757701 |
| MUFFLER, EXH (W/EXH PIPE) | CK157 (43) 6.2 (L86) | 23199937 |
| MUFFLER, EXH (W/EXH PIPE) | CK155 (43) 6.2 (L86), CK157 (53) 6.2 (L86) | 23440153 |
Warranty Information
For vehicles repaired under warranty, use:
| Labor Operation | Description | Labor Time |
| 4051980 | Exhaust Muffler Replacement | Use Published Labor Operation Time |
SEOCONTENT-END
Bulletin No.: PI1201A
Date: April, 2014
To View or Download this Document Click Here
Bulletin No.: PI1201A
Date: April, 2014
To View or Download this Document Click Here
Bulletin No.: PI1201
Date: March, 2014
To View or Download this Document Click Here
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DNA MOTORING CBE-CS09-4853L-4DR Stainless Steel Cat Back Exhaust System [Compatible with 07-13 Silverado 1500/07-13 Sierra 1500 Crew/Extended Cab Short Bed]
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