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.
2010 Chevrolet Silverado 1500 2WD V6-4.3LFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Locations
Harness Routing Views
Engine Harness Routing - Left Front Side (4.8L/5.3L/6.0L/6.2L except LFA/HP2)
1 - Air Intake Duct
2 - X111
3 - Fuse Block - Underhood X2
4 - X109
5 - X110 (NQF/NQG/NQH)
6 - Engine Control Module (ECM) X2
7 - Engine Control Module (ECM) X1
8 - G102
9 - J105
Engine Chassis Harness Routing - Top Front (Diesel)
1 - Battery - Right
2 - Fuse Holder
3 - X127
4 - X108
5 - X107
6 - X123 (PTO)
7 - Fuse Block - Underhood
8 - X109
9 - Battery - Left
10 - Engine Control Module (ECM)
11 - Transmission Control Module (TCM)
Engine Harness Routing - Top (4.3L)
1 - Mega Fuse Ring Terminal
2 - X175 (M30)
3 - J128
4 - J105
5 - J106
6 - J130 (M30 with NQG/NQH)
7 - Engine Control Module (ECM) X1
8 - Engine Control Module (ECM) X2
9 - G103
10 - X112
11 - Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Connector
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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