TSB: CADILLAC ESCALADE, ESCALADE ESV, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN, YUKON, YUKON XL (2020–2021)
Bulletin 21NA002 — January 13, 2021
Bulletin Details
| Bulletin ID | 21NA002 |
| Manufacturer | CADILLAC |
| Models | ESCALADE, ESCALADE ESV, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SUBURBAN, YUKON, YUKON XL |
| Model Years | 2020–2021 |
| Date Issued | January 13, 2021 |
| Date Added to NHTSA | May 3, 2021 |
| Component | ENGINE AND ENGINE COOLING |
| Vehicles Affected | 64 combinations |
What is a TSB?
A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.
If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.
Summary
This informational bulletin provides a test procedure, for a possible faulty DEF Heater.
Affected Vehicles
| Make | Model | Year | Component |
|---|---|---|---|
| CADILLAC | ESCALADE | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CADILLAC | ESCALADE | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CADILLAC | ESCALADE | 2021 | 080000 FUEL SYSTEM, DIESEL |
| CADILLAC | ESCALADE | 2021 | 060000 ENGINE AND ENGINE COOLING |
| CADILLAC | ESCALADE ESV | 2021 | 060000 ENGINE AND ENGINE COOLING |
| CADILLAC | ESCALADE ESV | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CADILLAC | ESCALADE ESV | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CADILLAC | ESCALADE ESV | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 1500 | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 1500 | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | SIERRA 1500 | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| GMC | SIERRA 1500 | 2021 | 060000 ENGINE AND ENGINE COOLING |
| GMC | SIERRA 2500 | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| GMC | SIERRA 2500 | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | SIERRA 2500 | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 2500 | 2021 | 060000 ENGINE AND ENGINE COOLING |
| GMC | SIERRA 3500 | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | SIERRA 3500 | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 3500 | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 1500 | 2021 | 080000 FUEL SYSTEM, DIESEL |
| CHEVROLET | SILVERADO 1500 | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 1500 | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SILVERADO 1500 | 2021 | 060000 ENGINE AND ENGINE COOLING |
| CHEVROLET | SILVERADO 2500 | 2021 | 060000 ENGINE AND ENGINE COOLING |
| CHEVROLET | SILVERADO 2500 | 2021 | 080000 FUEL SYSTEM, DIESEL |
| CHEVROLET | SILVERADO 2500 | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SILVERADO 2500 | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 3500 | 2021 | 080000 FUEL SYSTEM, DIESEL |
| CHEVROLET | SILVERADO 3500 | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SILVERADO 3500 | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SUBURBAN | 2021 | 060000 ENGINE AND ENGINE COOLING |
| CHEVROLET | SUBURBAN | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SUBURBAN | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SUBURBAN | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | YUKON | 2021 | 060000 ENGINE AND ENGINE COOLING |
| GMC | YUKON | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | YUKON | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | YUKON | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| GMC | YUKON XL | 2021 | 060000 ENGINE AND ENGINE COOLING |
| GMC | YUKON XL | 2021 | 080000 FUEL SYSTEM, DIESEL |
| GMC | YUKON XL | 2021 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | YUKON XL | 2021 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| GMC | SIERRA 1500 | 2020 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| GMC | SIERRA 1500 | 2020 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | SIERRA 1500 | 2020 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 1500 | 2020 | 060000 ENGINE AND ENGINE COOLING |
| GMC | SIERRA 2500 | 2020 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| GMC | SIERRA 2500 | 2020 | 060000 ENGINE AND ENGINE COOLING |
| GMC | SIERRA 2500 | 2020 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | SIERRA 2500 | 2020 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 3500 | 2020 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| GMC | SIERRA 3500 | 2020 | 080000 FUEL SYSTEM, DIESEL |
| GMC | SIERRA 3500 | 2020 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 1500 | 2020 | 060000 ENGINE AND ENGINE COOLING |
| CHEVROLET | SILVERADO 1500 | 2020 | 080000 FUEL SYSTEM, DIESEL |
| CHEVROLET | SILVERADO 1500 | 2020 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SILVERADO 1500 | 2020 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 2500 | 2020 | 060000 ENGINE AND ENGINE COOLING |
| CHEVROLET | SILVERADO 2500 | 2020 | 080000 FUEL SYSTEM, DIESEL |
| CHEVROLET | SILVERADO 2500 | 2020 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 2500 | 2020 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SILVERADO 3500 | 2020 | 353800 EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER |
| CHEVROLET | SILVERADO 3500 | 2020 | 061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) |
| CHEVROLET | SILVERADO 3500 | 2020 | 080000 FUEL SYSTEM, DIESEL |
Related CADILLAC Recalls
What Should You Do?
If your vehicle is affected by this TSB, contact your authorized CADILLAC dealer. Bring this bulletin ID (21NA002) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.
Frequently Asked Questions
A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.
If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.
Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.
This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.