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Username Post: p0171 and p0174 code questions        (Topic#270403)
jjchevy 
Forum Newbie
Posts: 4

Reg: 09-22-11
10-10-11 06:25 AM - Post#2145819    

My check engine light came on a few days ago, had the codes checked out and autozone said they were p0171 and p0174. What does this mean. What should I check first or replace first. The lady at autozone was very unhelpful other than giving me the codes.

Also had to replace the altenator last night would that have caused those codes?

It is a 2006 silverado 5.3

Edited by jjchevy on 10-10-11 06:26 AM. Reason for edit: No reason given.

 
LMC Trucks
wagonman100 
Super Senior Member
Posts: 13553
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
10-10-11 04:24 PM - Post#2146008    
    In response to jjchevy

Welcome to CT. Some great people on here. The alternator may have vaguely been connected to the codes. The codes are for lean fuel mixture on bank 1 (P0171) and bank 2 (P0174). A low voltage condition due to the alternator being bad could possibly have caused this.

If the codes are cleared and don't come back, then that was probably the problem. If they come back, you could have a dirty MAF sensor or possibly and air leak downstream of the MAF. You could also have a O2 sensor starting to go bad causing false readings and making the computer lean out the fuel mixture too much.
Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
jjchevy 
Forum Newbie
Posts: 4

Reg: 09-22-11
10-11-11 05:33 PM - Post#2146403    
    In response to wagonman100

Thanks I cleaned my MAF and it seems to have cleared up the problem.

 
weee_willie 
Forum Newbie
Posts: 4

Loc: Milwaukee
Reg: 08-29-11
10-28-11 12:02 PM - Post#2152088    
    In response to wagonman100

I too had the exact same problem with my 2006 Silverado 1500, 5.3L.

Cleaned the MAF..no help. Replaced the MAF with a rebuilt..no change. Installed New MAF...still no change. Now yesterday when accelerating, the engine rpm reved up but no power. After I parked at work and tried to start up after several hours, the engine would turn over & over but no start. A friend suggested banging on the fuel tank while turning the key and it started up.

Could this be.....gulp.....a bad fuel pump??

my mileage had been steadily decreasing. Down to 14.0 mpg. I was averaging 19.2 before all of this started.

 
wagonman100 
Super Senior Member
Posts: 13553
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
10-28-11 01:33 PM - Post#2152112    
    In response to weee_willie

Starting after banging on the tank after a no start situation usually means the pump is done.
Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
weee_willie 
Forum Newbie
Posts: 4

Loc: Milwaukee
Reg: 08-29-11
10-30-11 06:23 AM - Post#2152580    
    In response to wagonman100

That's what I was afraid of. Dang truck isn't even paid off yet. There goes a truck payment!

Edited by weee_willie on 10-30-11 06:23 AM. Reason for edit: No reason given.

 
weee_willie 
Forum Newbie
Posts: 4

Loc: Milwaukee
Reg: 08-29-11
11-02-11 08:17 AM - Post#2153772    
    In response to weee_willie

Problem solved. Had the fuel pump replaced and cleared up a couple up the problem, along with the radio buzzing.

Kind of an expensive solution for a vehicle that is only five years old.

Of course the warranty had expired!

Thanks for your help!

 
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