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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2025 GMC Sierra 2500 HD AT4X, 6.6L Eng VIN Y
GMC: 2025: Sierra 2500 HD AT4X, 6.6L Eng VIN Y
2025 GMC Sierra 2500 HD AT4X, 6.6L Eng VIN YSECTION Sierra 2500 HD AT4X, 6.6L Eng VIN Y
This is a LEMON manual, retrieved in 2025.
Repair and Diagnosis
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Labor Times
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- Sierra 2500 HD AT4, 6.6L Eng VIN Y
- Sierra 2500 HD Denali, 6.6L Eng VIN Y
- Sierra 2500 HD Denali Ultimate
- Sierra 2500 HD Pro, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD Pro, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD Pro, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD Pro, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD Pro, 2D Pickup, 6.6L Eng VIN Y, RWD
- Sierra 2500 HD Pro, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD Pro, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD Pro, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD Pro, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD Pro, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD
- Sierra 2500 HD Pro, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD Pro, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD Pro, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD Pro, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD Pro, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD
- Sierra 2500 HD SLE, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD SLE, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD SLE, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD SLE, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD SLE, 2D Pickup, 6.6L Eng VIN Y, RWD
- Sierra 2500 HD SLE, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD SLE, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD SLE, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD SLE, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD SLE, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD
- Sierra 2500 HD SLE, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD SLE, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD SLE, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- Sierra 2500 HD SLE, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- Sierra 2500 HD SLE, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD
- Sierra 2500 HD SLT, 6.6L Eng VIN Y, 4WD
- Sierra 2500 HD SLT, 6.6L Eng VIN Y, RWD
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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.