NHTSA ID Number: 10187770
Manufacturer Communication Number: 21NA007
Summary
This technical bulletin provides a procedure to program the reductant fluid module if found the cause of the customers concern.
8 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CHEVROLET | SILVERADO 1500 | 2020-2021 |
| CHEVROLET | SILVERADO 2500 | 2020-2021 |
| GMC | SIERRA 1500 | 2020-2021 |
| GMC | SIERRA 2500 | 2020-2021 |
SEOCONTENT-START
Service Bulletin Bulletin No.: 21-NA-007
Date: January, 2021
INFORMATION
Subject: Diagnostic Tip to Diagnose Emission Reduction Fluid Tank Electrical Connector
Inspection, Reduced Power Message, Service Emissions System, System Displayed
on the Drivers Information Center (DIC) Malfunction Indicator Lamp (MIL) Illuminated –
DTC P02C1, P21DD, P221C, P10D9, P10F3, P143C, P20B9, and/or P221E
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Cadillac Escalade Models 2021
2021
LM2
Chevrolet
Silverado 1500 2020 LM2
Silverado
2500HD/3500HD 2020 L5P
Suburban 2021 LM2
GMC
Sierra 1500 2020 LM2
Sierra 2
500HD/3500HD 2020 L5P
Yukon Models 2021 LM2
Involved Region or Country
North America, Uzbekistan, Russia, Middle East, Israel, Palestine, Chile (West),
Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Uruguay (West),
Japan, Cadillac Korea (South Korea), Thailand (ASEAN), Australia/New Zealand
Condition
Some customers may comment that the MIL is illuminated and a reduced power message
with a Service Emissions System message as well.
Some technicians may one or more of the following DTCs set in the Engine Control
Module (ECM):
• P20C1: Reductant Heater 3 Control Circuit
• P21DD: Reductant Tank Heater 1 Low Current
• P221C: Reductant Tank Heater 2 High Current
• P10D9: Reductant Heater 1 Control Circuit Shorted
• P10F3: Reductant Heater 2 Control Circuit Shorted Reductant Heater 2 Control Circuit
• P143C: Reductant Heater 3 Control Circuit Shorted Reductant Heater 2 Control
Circuit
• P20B9: Reductant Heater 1 Control Circuit
• P221E: Reductant Tank Heater 3 Low Current
Some technicians may also find when commanding one of the heaters on, that there is no
current, 0 amps in GDS2 or unable to command the heaters on.
Cause This condition may be caused by a poor connection at the Emission Reduction Fluid Tank
electrical connector.
Page 2 January, 2021 Bulletin No.: 21-NA-007
Correction
5708899
Inspect the Emission Reduction Fluid Tank electrical connector for any signs of damage
and repair as necessary.
If this condition is not found, refer to normal SI diagnostics
Version 1
Modified Released January 20, 2021
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-007
Date: January, 2021
MC-10187770-9999.pdf 979.906KB
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