08 Silverado w/ check engine light on

75

Asked by Jul 29, 2011 at 10:03 PM about the 2008 Chevrolet Silverado 1500 LT1 Crew Cab

Question type: Maintenance & Repair

I have a 08 Silverado 4.8L. The check engine light came on. I took it to Auto Zone. They said cylinder #4 is misfiring. Probable cause is faulty spark plug, wire or core. I have all the items replaced, and the light came back on and Im getting the same code after replacing everything new. Does anyone out there know what the problem may be. The truck only has 78K on it and runs like a top, but I hate seeing that light on.

19 Answers

unhook your battery,eather side for about 10 minutes,it will clear the code from computer and light will go out.

8 out of 8 people think this is helpful.
2,945

is it a dead miss?

3 out of 3 people think this is helpful.
75

Ill give it a try. I had Auto Zone clear the code with the computer, and it stayed off for a day, then came back on.

7 out of 7 people think this is helpful.
70

I DONT HAVE THE ANSWER BUT MY TRUCK IS DOING THE SAME THING, BUT THE CHECK ENGINE LIGHT COMES ON AND THEN THE CONSOLE READ A/C OFF ENGINE HOT BUT MY ENGINE IS NOT HOT. NOW MY AC WILL NOT COME ON

7 out of 7 people think this is helpful.
475

take it to a dealership and have them check the engine if the 4th cylinder is missing there may be a problem with the engine if it's under 100k they should replace it for you they did on my cobalt at 76k

2 out of 2 people think this is helpful.
1,045

does it sound rough when it runs that would confirm a missfire as a probability it could be causted by a mistiming

2 out of 2 people think this is helpful.
105

sounds like a coil pack for # 4.

1 out of 1 people think this is helpful.
1,845

most common problem is bad lifter for missfire , you also hear slight noise , yes as jean stated the warrenty is 5years 100k so dealer can warrenty that

1 out of 1 people think this is helpful.
10

fdaniels< i had the same thing happen to mine it turned out the thurmostate was bad, powertrain covered it.

1 out of 1 people think this is helpful.
50

I drive 100 miles per day. My 4.8 dropped cylinder 4 at 116000 miles. Ran great with a little rough idle once in a while. Dealer serviced regularly.

5 out of 5 people think this is helpful.
60

Did you ever find out what the problem was I have the same issue I have changed my wires plug and the coil and it is still lighting up check engine misfire 4 my ruck is past warranty I'm 180000 miles thus is the only problem with the truck it's in excellent condition besides this

6 out of 6 people think this is helpful.

I have two Colorado's I've been told that a code reading misfire on cylinder 4 can be bad catalytic converters as well.

20

I have 2009 Chevy Silverado, it has a little over 81,000 miles on it. I've brought my truck into dealer about 4 times since fourth July weekend for check engine and truck shutting down on me. They have changed the throttle. The evap, and the computer module. Every time I go in and they say it's this or that and they change it i come home and several days later check engine light is on yet again. I feel like I'm getting scammed here! Anyone else's have this issue with their truck???

2 out of 2 people think this is helpful.
40

I have a 2008 Chevy Silverado w/ a 4.8 engine that has 85,700 to date. The summer of 2014 my engine check light came on with 78- 79k miles. took it to an auto parts store where they hooked up their little machine and gave me a code of PO 442, which tells me to replace the gas cap. Did that and within 7 days the light came back on. Someone suggested I disconnect the batterie, then reconnect the terminals. did that just to get it to pass the emission part of the inspection. Light came back on within 7 days. Took it to the dealer where I bought it ( 9/14 ) where the same code came up and they replaced the e-cap valve. $257. Within 7days it came back on. Now they tell me it is a gasket above the gas tank that has corroded. $700. Gm will kick in $300. I said the 1st repair didn't take care of it like your machine said so why should I believe it again? It was explain that there are several emission parts that fall under this PO442 so why should I pay out $$$ to chase this. It is still on and my inspection is due this month. I'm at a loss !!!!

4 out of 4 people think this is helpful.
20

I have the same problem in a 2008 chevy silverado.. i took it last summe 2015 to the dealership..spent almost $3000 on it.. and now its doing the samething back again!! and if i take it back, i have to pay again!! 1 year after they fixed it, ita happening again!!

2 out of 2 people think this is helpful.

I have a 08 silverado 4x4 z71 crew cab,I put 93 octane in it and engine light came on,what's the problem. .

I just filled up with 93 octane and same thing happened. Wth

It's probably your evap system, the filters. .check that,or you need a new gas cap

60

I have swapped out wires, plugs ,coils, p446, and the gas line ,gas cap, ran seafoam, new alternator, it is a slight misfire stated but the diagnostics check also had throttle body replaced. It's been on for years misfire cylinder 4 and hesitation during warm up between 180*-210*.

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