Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2021SIERRA 2500 HD AT4, 6.6L ENG VIN 7REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROLS AND FUEL - 6.6L (L5P) DIESEL - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSREDUCTANT CONTROL MODULE REPLACEMENT (CREW CAB)
2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7
Reductant Control Module Replacement (Crew Cab)
2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7SECTION Reductant Control Module Replacement (Crew Cab)
WARNING: This page is about a different variant/trim than selected.
| Callout | Component Name |
|---|---|
| Preliminary Procedure Emission Reduction Fluid Tank Heat Shield Replacement (Crew Cab) |
|
| 1 | Emission Reduction Fluid Controller Bolt [2x]
CAUTION:
Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in) |
| 2 | Emission Reduction Fluid Controller Procedure
|
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.