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.
2008 Chevrolet Impala V6-3.5LFACTORY OEM SERVICE PROCEDURE
Main Relay (Computer/Fuel System): Locations
IGN MAIN RELAY
The Ign Main PCB relay is located in the Underhood Fuse Block (1). The Underhood Fuse Block (1) is located on the right side of the engine compartment, mounted to the strut tower.
IMPORTANT: This relay is a Printed Circuit Board (PCB) relay, and is only repaired by replacing the Underhood Fuse Block.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.