Knock Tick Noise 2009 Cadillac Escalde Hybrid

Question by CHill posted 1 year ago in 1999-2000 (1st gen)

Running great check engine light started blinking turned it off, turned on the car it stated shaking making a loud noise thought it was the lifters, put motor flush cleaner twice, once with the old oil then changed it then again the motor flush and changed the oil with new filter. Still knocking and ticking. Oil light is off but still check engine light is on. It was running perfectly on the freeway then the light started blinking with no noise, turned it on with tons of noise and shaking.