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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
https://www.nhtsa.gov/recalls?nhtsaId=10205584
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- UNSURPASSED FREEZE PROTECTION AND ANTI-BOIL PERFORMANCE outperforms industry standards
- ORGANIC ACID TECHNOLOGY RESISTS RUST, SCALE & CORROSION while protecting all cooling system metals (including aluminum)
- HIGH-QUALITY ADDITIVES PROTECT AGAINST LEAKS and won’t harm gaskets, hoses, plastics or original vehicle finish
- ORANGE CONCENTRATE FORMULA should be mixed with clean tap water or demineralized water at 50/50 ratio for temperatures -34 to 265F; 60/40 for -62 to 270F; and 70/30 for -84 to 267F
- VERSATILE ENGINE COOLANT: This antifreeze + coolant is designed for use in all GM vehicles 1995 and newer requiring an orange organic acid technology (OAT) coolant. This item contains a bittering agent called Denatonium Benzoate.
- PROTECTS ENGINE: This antifreeze + coolant provides protection against rust and corrosion for all cooling system metals, including aluminum
- LONG-LASTING COOLANT: This antifreeze + coolant has a service life of up to 5 years/150,000 miles with a complete cooling system flush and fill
- BETTER FORMULA: Our antifreeze coolant solution is free of amines, phosphate, borate, nitrite and silicate
- EXCELLENT PERFORMANCE: This meets the performance requirements of ASTM D3306, D4985 and GMW3420, GM6277M
- ACDelco 10-101 DEX COOL (ORANGE)
- Contains A Bittering Agent
- OEM
- ZEREX DEX-COOL antifreeze coolant is approved by General Motors to the GM 6277M specification
- ZEREX DEX-COOL antifreeze coolant contains no phosphates, silicates, borates, nitrates, amines and nitrites
- Valvoline ZEREX DEX-COOL antifreeze coolant is a patented carboxylate formulation with a service life of up to five years or 150,000 miles
- When diluted 50percent with water, ZEREX DEX-COOL protects modern engine components from winter freezing and summer boiling
- For any product use or product technical questions call 1-800-TEAM-VAL
- ZEREX DEX-COOL antifreeze coolant is approved to the GM 6277M specification
- ZEREX DEX-COOL antifreeze coolant contains no phosphates, silicates, borates, nitrates, amines and nitrites
- Valvoline ZEREX DEX-COOL antifreeze coolant is a patented* carboxylate formulation with a service life of up to five years or 150,000 miles
- When diluted 50% with water, ZEREX DEX-COOL protects modern engine components from winter freezing and summer boiling
- For any product use or product technical questions call 1-800-TEAM-VAL
- ZEREX DEX-COOL antifreeze coolant is approved by General Motors to the GM 6277M specification
- ZEREX DEX-COOL antifreeze coolant contains no phosphates, silicates, borates, nitrates, amines and nitrites
- Valvoline ZEREX DEX-COOL antifreeze coolant is a patented* carboxylate formulation with a service life of up to five years or 150,000 miles
- When diluted 50% with water, ZEREX DEX-COOL protects modern engine components from winter freezing and summer boiling
- ZEREX DEX-COOL antifreeze coolant is storage stable for up to five years as both a concentrate or diluted with water
- Recommended and formulated for use in all vehicles that require Dex-Cool coolant
- Also for use with cars and light-duty trucks with aluminum radiators using extended life coolant
- Blend of premium long-lasting inhibitors provides extended performance
- Protects against temperature extremes and the ravages of rust and corrosion
- Good for 5 years or 150,000 miles
- Contains a bittering agent
- 1 GALLON ENGINE ANTIFREEZE/COOLANT: Fully compatible with other extended life antifreeze/coolants. This item contains a bittering agent called Denatonium Benzoate.
- PROTECTS: Advanced formulation prevents rust & corrosion protecting all engine cooling system components
- DESIGNED FOR NORTH AMERICAN VEHICLES: Recommended for use with Ford, Chrysler, and GM vehicles that require an orange organic acid technology formula
- GUARANTEED: When installed as part of a complete flush and fill, PEAK guarantees this coolant will provide service life protection of up to 150,000 miles or 5 years.
- CONCENTRATED FORMULA: Ideal for flushing, filling, or topping off your cooling system
- UNSURPASSED FREEZE PROTECTION AND ANTI-BOIL PERFORMANCE outperforms industry standards
- ORGANIC ACID TECHNOLOGY RESISTS CORROSION, SCALE AND RUST while protecting all cooling system metals (including aluminum)
- HIGH-QUALITY ADDITIVES PROTECT AGAINST LEAKS and won’t harm gaskets, hoses, plastics or original vehicle finish
- PRE-MIXED ORANGE FORMULA IS READY-TO-USE in a 50/50 ratio with deionized water to protect all modern engine components from winter freezing (-34F) and summer boiling (265F).
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