Fuel gauge doesn’t move after installing subs

1184 Views 6 Replies 3 Participants Last post by repairman54, Jul 24, 2020

Shiro

Discussion Starter · Jul 9, 2020

Hey everyone! So I have a 2013 Malibu ls(2.5lt engine) and recently installed a sub box. After the install I noticed the service airbag lights comes on and the fuel gauge doesn’t move. The fuses seem ok though I only noticed 1 for the fuel gauge. When I move the key to “ON”, it will move the needle up and down smoothly, just not when the engine is started. The lcd screen also just constantly says low fuel. I know the fuel pump module needs to be replaced but it only started happening after the install. Any advice?

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repairman54

· #3 · Jul 10, 2020

Engine-codes.com is a good resource.
You need the U codes to be read also, those are communication failure codes that indicate issues in the onboard data stream and help with diagnosis.
A 4 code families need to be read not just the P codes.

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repairman54

· #7 · Jul 24, 2020

Cleaning the module connectors would be my first action with a electrical contact cleaner.

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