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I have a p1548 ac recirculation code showing up with a CEL…

Customer Question
I have a p1548...

I have a p1548 ac recirculation code showing up with a CEL on the dash; OnStar gave me the code. Just occurred yesterday when I remote started the vehicle.

Mechanic's Assistant: Does the light stay on, or does it blink?

Just stays on; not blinking, so I know it's not critical at this point

Mechanic's Assistant: What is the model/year of your Chevy?

2015 3500 HD Silverado

Mechanic's Assistant: Are you fixing your Silverado yourself? What have you tried so far?

Only grabbed the code; was out all day yesterday and most of today would like to see if I can diagnose the problem and fix it myself if it's not too complicated

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Oddly enough, there was a strong "electric" smell in the truck when I got in it and noticed the CIL; maybe a short?

Submitted: 6 months ago.Category: Chevy
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Answered in 5 minutes by:
1/1/2018
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,767
Experience: owner/mechanic at 3D Automotive
Verified

Hi my name is ***** ***** I'll be more than happy to assist you. Please allow me a few minutes to review your information. Thank you

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

definitely a shorted wire between the recirculation actuator and the control panel

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Customer reply replied 6 months ago
anyway to know if it is beyond the firewall or on the inside?
Customer reply replied 6 months ago
I probably don't have the tools to take the control panel out of the dash and examine it; but I could trace the leads running into the engine compartment from the firewall
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

i would access the recirc valve and check the condition of the connector and the wiring in the immediate area before chasing it any further

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

standby for the location

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Customer reply replied 6 months ago
ok; this is a duramax if that makes a difference
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

understood

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Customer reply replied 6 months ago
ok, i'll check the connectors and wiring; give me a few
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

ok sure, take your time. inspect the wiring very good

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Customer reply replied 6 months ago
all of the wiring looks good; all connections are tight; nothing dislodged
Customer reply replied 6 months ago
however I do notice that when I hit the "recir" button on the dash, it lights up, but the fan inside the recir box does not spin
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

there's no fan in the recirc box, its an actuator unless you mean the blower motor

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

does anything on the control panel work?

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Customer reply replied 6 months ago
oh, ok. maybe I mistook the "vent" behind the square screen for something else. it matched up to the picture perfect. so all the wiring is good; the fans work; heater, A/C, defrost
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

ok so when you hit the recirc button it flashes and the actuator does move?

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Customer reply replied 6 months ago
what's next? maybe it was a "glitch" and all is well?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

sitting in the vehicle with the key on engine off, when you hit the recirc button can you hear the door open or shut?

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Customer reply replied 6 months ago
I cannot hear a door shut while sitting in the vehicle with it running
Customer reply replied 6 months ago
Now it does.
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

key on. engine off. please

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

no more fashing of button?

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Customer reply replied 6 months ago
Ok now that I've got it warmed up I can definitely hear a distinct change in the fan sound when I hit the recirc button
Customer reply replied 6 months ago
Button does not flash at all
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

ok, sounds like youre ok. sounds like a glitch....

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

still have a code?

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Customer reply replied 6 months ago
Check engine light still on. I don't Have a code reader so I had to have onstar pull it down for me
Customer reply replied 6 months ago
Probably no way to reset the check engine light I guess without going to a mechanic
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

disconnect the battery for 30 minutes

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Customer reply replied 6 months ago
OK I will try that
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

let me know and Please note that customer satisfaction is my number one goal and rating this chat session 3 or more stars will be greatly appreciated and will allow any follow up questions you may have. we can chat back and forth many times until your issue is taken care of.
Thank you for rating my assistance and for using Just Answer.

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Customer reply replied 6 months ago
Do I need to disconnect both Poles or just the negative
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

disconnect both, rub them together for 20 seconds and let them sit for 30 minutes before reconnecting

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Customer reply replied 6 months ago
I have an auxiliary battery. Disconnect it too?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

no

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Customer reply replied 6 months ago
Couldn't get positive terminal off have to take it to a dealer
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

no, don't take to dealer. any shop can reset the code.

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

unless that's covered under a warranty

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Customer reply replied 6 months ago
Maybe an auto parts store. It's just out of warranty
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

im not sure auto parts stores are allowed to erase codes. at least here in pa. they arent

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Customer reply replied 6 months ago
Ok. The positive pole is on way too tight. Don't know how to get it off without breaking something
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

I wouldn't try it then. you can buy a cheap code reader for like 40.00 at harbor freight to erase the codes

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

plus you'll have it in case the cel come on in the future

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Customer reply replied 6 months ago
I've seen some on Amazon. Is there one you'd reccommend?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

standby

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Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

this is a simple one but a good name brand

http://www.tooldiscounter.com/ItemDisplay.cfm?lookup=ACTCP9125&source=froogle&kw=ACTCP9125&gclid=EAIaIQobChMI3YfZ6ue12AIVV1cNCh2C7A-6EAQYASABEgJMzvD_BwE

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Customer reply replied 6 months ago
ANCEL AD410 Enhanced OBD II Vehicle Code Reader. What about this one?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

that'll work

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Customer reply replied 6 months ago
David. Code did not reset after terminal disconnect. So took it to a friend. He had code reader. Code that he pulled was P154A. An intake heater circuit issue. We cleared the code and started truck. Check engine light stayed off. Then we tried again only this time using remote start. We got it to turn over but no start. Then noted check engine light was now on. Seems light and remote start are connected.
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

aftermarket remote start?

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Customer reply replied 6 months ago
Factory remote start
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

I'm not really sure on this one then. I'm going to open it up to the others, these are totally different problems.

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Customer reply replied 6 months ago
Ok
Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago
Todd Audette
Todd Audette, Chevy Technician
Category: Chevy
Satisfied Customers: 427
Experience: Chevrolet Technician
Verified

Hi my name is ***** ***** see if i can help you....but as the other expert David Craig has informed you....you have more than 1 issue here so what is your first and foremost concern

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Customer reply replied 6 months ago
The p154A code
Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago

ok...give me a few mins....truck out of warranty?

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Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago

Any aftermarket air filter or anything like that?

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Customer reply replied 6 months ago
No. All stock
Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago

Ok just so we are on the same page,,,the P154A has to do with the intake air temp to the engine.......nothing to do with the inside of the vehicle

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Customer reply replied 6 months ago
Correct. The first code was pulled by on star. This one, which I'm more sure of was pulled by a OBDII reader. It was listed as occurring 3 times. So I'm pretty sure this is the issue
Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago

How many miles on the truck

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Customer reply replied 6 months ago
45k
Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago

Send me your VIN....your issue may still be covered by your powertrain warranty....i can check that for you

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Customer reply replied 6 months ago
I'll have to get that to you after coaching bball practice
Chevy Mechanic: Todd Audette, Chevy Technician replied 6 months ago

Ok...i'll try to check in later...if not first thing in the morning,,,,,i'm in EST....south Florida

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