2012 CHEVROLET Impala LLT/LFX (GMX151)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing chain noise on higher mileage LLT engines
• Cam phaser failure in some V6 variants

First checks

• Check timing chain condition and tensioners
• Inspect cooling system for leaks

Avant de remplacer des pièces

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• Engine options and specs vary by market; US market primarily received LLT and LFX 3.6L V6 engines.
• 3.9L LWE engine more common in Canadian and some international markets, with lower power output.