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NHTSA ID Number: 10205584
Manufacturer Communication Number: 21NA265
Summary
This technical bulletin provides a procedure to re-route the coolant hose away from the front prop shaft to avoid contact.
12 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | 3500 | 2020-2022 |
| CHEVROLET | SILVERADO 2500 | 2020-2022 |
| GMC | SIERRA 2500 | 2020-2022 |
| GMC | SIERRA 3500 | 2020-2022 |
Condition
Some customers may comment on one or more of the following conditions:
- Coolant leak under the vehicle
- MIL illuminated
Some technicians may find DTC P2C48 set in the Engine Control Module (ECM).
Cause
This condition may be caused by the fuel cooler coolant hose contacting front drive shaft at crossmember.
– Typically can happen when driving through deeper water or snow.
Correction
Follow the procedure below to re-route the coolant hose away from the front drive shaft:
1. Utilizing a 6.5 mm drill size, drill a hole in the transmission crossmember in the approximate location noted in the graphic above.
2. Add retainer or equivalent, onto the hose.
3. Install retainer into the hole in the crossmember.
SEOCONTENT-START
Service Bulletin Bulletin No.: 21-NA-265
Date: November, 2021
TECHNICAL
Subject: Coolant Leak Under Truck, Malfunction Indicator Lamp (MIL) Illuminated – DTC
P2C48 Set
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Silverado 2
500HD/3500HD
2020 2022 L5P
GMC Sierra
2500HD/3500HD
Involved Region or Country North America, Middle East, Israel, Australia, New Zealand
Condition
Some customers may comment on one or more of the following conditions:
• Coolant leak under the vehicle
• MIL illuminated
Some technicians may find DTC P2C48 set in the Engine Control Module (ECM).
Page 2 November, 2021 Bulletin No.: 21-NA-265
Cause
This condition may be caused by the fuel cooler coolant hose contacting front drive shaft
at crossmember.
– Typically can happen when driving through deeper water or snow.
Correction
Follow the procedure below to re-route the coolant hose away from the front drive shaft:
5924533
1. Utilizing a 6.5 mm drill size, drill a hole in the transmission crossmember in the
approximate location noted in the graphic above.
5924534
2. Add retainer or equivalent, onto the hose.
3. Install retainer into the hole in the crossmember.
Bulletin No.: 21-NA-265 November, 2021 Page 3
Parts Information
Causal Part Description Part Number Qty
N/A Retainer 13596790
(Hollingsworth) 1
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor Operation Description Labor Time
4088308* Drill Hole in Crossmember and add Clip 0.5 hr
*This is a unique Labor Operation for Bulletin use only.
Version 1
Modified Released November 18, 2021
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-265
Date: November, 2021
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