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CEL constantly coming on

CEL constantly coming on

Postby 660catman [OP] » Oct 23 2020, 12:26am

I’m getting tired of resetting my CEL due to codes coming up. All 4 O2 sensors were changed last year. Since early September I have had P015D twice, P015B, P0172 and today P0175. Is there another issue causing the O2 sensors to trigger the light?
192k kilometres, no AFM delete, no Range device and no issues with oil consumption.


2013 Silverado LT CC 1500 Z71 5.3 4WD 3:42’s all stock
2013 Silverado 1500 Z71 CC 5.3 4WD 3:42's and all stock
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660catman
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Re: CEL constantly coming on

Postby nealinator » Oct 23 2020, 12:37am

The possible causes of P0175 are:

The MAF (Mass Air Flow) Sensor is dirty or faulty.

There could be a vacuum leak.

There could be a fuel pressure or delivery problem
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Nealinator's 5.3L 4x4 Z71 All Terrain192,029 miles
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Re: CEL constantly coming on

Postby 660catman [OP] » Oct 23 2020, 12:58am

I’ve been reading on here about alcohol content. Is that something I can check or do you need the equipment for that? Truck is flex fuel but have never ran E85 in it. Also tailpipe is very black and the chrome on the right rear mudflap is always has black spots on it.


2013 Silverado LT CC 1500 Z71 5.3 4WD 3:42’s all stock
2013 Silverado 1500 Z71 CC 5.3 4WD 3:42's and all stock
Original Poster
660catman
Combustion on 5 pistons [L2]
Combustion on 5 pistons [L2]
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Joined: Dec 13 2017, 12:27pm
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Re: CEL constantly coming on

Postby nealinator » Oct 23 2020, 1:53am

Most of us who had the ethanol % go whacky had a hard to start when cold. It can be read with a diablosport intune device or with a torque app and an OBD2 dongle.

Mine is running within spec and tuned by Lew and I still get soot on my tail pipe tips.
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Nealinator's 5.3L 4x4 Z71 All Terrain192,029 miles
AMP Power Steps - Retrax Pro Cover - Terra Grappler G2 - Airaid MIT - Mobil 1
Borla Exhaust - Eonon GA7180 - Custom Catch Can - Bilstein 5100's - $ Cost $ - DiabLew Tune
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Re: CEL constantly coming on

Postby 660catman [OP] » Oct 23 2020, 2:36am

Well I have no problem with starts so I can assume alcohol % is within spec. I’ll clean the MAF sensor and see what happens. Not sure if it’s a factor but the CEL comes on during short runs. Back in August I went on a 5000 kilometre trip without issue. 2 weeks ago I went on a 2000 kilometre trip, no issues. Fuel consumption averaged 15 mpg on the long trip and 18 mpg on the shorter trip. Hauled a 12’ cargo trailer on big trip.


2013 Silverado LT CC 1500 Z71 5.3 4WD 3:42’s all stock
2013 Silverado 1500 Z71 CC 5.3 4WD 3:42's and all stock
Original Poster
660catman
Combustion on 5 pistons [L2]
Combustion on 5 pistons [L2]
Posts: 574
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Joined: Dec 13 2017, 12:27pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: SE Manitoba Canada
Year: 2013
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Extra Info: 1500 CC 5.3 4WD
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Re: CEL constantly coming on

Postby 660catman [OP] » Oct 23 2020, 7:33pm

After playing with my new scan tool I found out alcohol % is at 48.2. How is that possible when I have never ran E85?

Image


2013 Silverado LT CC 1500 Z71 5.3 4WD 3:42’s all stock
2013 Silverado 1500 Z71 CC 5.3 4WD 3:42's and all stock
Original Poster
660catman
Combustion on 5 pistons [L2]
Combustion on 5 pistons [L2]
Posts: 574
Topics: 5
Joined: Dec 13 2017, 12:27pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: SE Manitoba Canada
Year: 2013
Make/Model: Chevrolet Silverado
Variant: LT
Extra Info: 1500 CC 5.3 4WD
Group Membership:
Registered users

Re: CEL constantly coming on

Postby nealinator » Oct 23 2020, 7:44pm

It is an issue with the ECU making incorrect calculations. I think this is the first 2013 I have seen with that happen. Usually it has been on slightly older ones like mine.
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Nealinator's 5.3L 4x4 Z71 All Terrain192,029 miles
AMP Power Steps - Retrax Pro Cover - Terra Grappler G2 - Airaid MIT - Mobil 1
Borla Exhaust - Eonon GA7180 - Custom Catch Can - Bilstein 5100's - $ Cost $ - DiabLew Tune
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Re: CEL constantly coming on

Postby SierraHarley » Oct 23 2020, 7:54pm

You probably got an alcoholic truck and it's been sneaking drinks while you weren't watching.
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Re: CEL constantly coming on

Postby 660catman [OP] » Oct 23 2020, 8:24pm

SierraHarley wrote:You probably got an alcoholic truck and it's been sneaking drinks while you weren't watching.
A thousand comedians out of work and you want to be one of them lol!


2013 Silverado LT CC 1500 Z71 5.3 4WD 3:42’s all stock
2013 Silverado 1500 Z71 CC 5.3 4WD 3:42's and all stock
Original Poster
660catman
Combustion on 5 pistons [L2]
Combustion on 5 pistons [L2]
Posts: 574
Topics: 5
Joined: Dec 13 2017, 12:27pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: SE Manitoba Canada
Year: 2013
Make/Model: Chevrolet Silverado
Variant: LT
Extra Info: 1500 CC 5.3 4WD
Group Membership:
Registered users

Re: CEL constantly coming on

Postby 660catman [OP] » Oct 23 2020, 9:25pm

Does anything look out of the normal to anyone?
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2013 Silverado LT CC 1500 Z71 5.3 4WD 3:42’s all stock
2013 Silverado 1500 Z71 CC 5.3 4WD 3:42's and all stock
Original Poster
660catman
Combustion on 5 pistons [L2]
Combustion on 5 pistons [L2]
Posts: 574
Topics: 5
Joined: Dec 13 2017, 12:27pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: SE Manitoba Canada
Year: 2013
Make/Model: Chevrolet Silverado
Variant: LT
Extra Info: 1500 CC 5.3 4WD
Group Membership:
Registered users
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