P018B Code 21 3.0L Duramax

[sethro274]

It’s cold in Texas this week as y’all know. I have had my truck plugged in but it is outside under a carport. I went to start it today and it had a check engine light on. I thought it was just cold so I have left it at idle for a while to warm up. When I tried to move it beyond a slow idle it will die. OnStar ran a diagnostic and it shows P018B for the fuel pump. My truck only has 2900 miles and the tank is full. Could the cold we have be experiencing have anything to do with it? Thick Diesel?

 

 

Edit: There is also a high pitched wine/whistle coming from under the fuel tank, it sounds like.

 

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[gemarsh]

5 hours ago, sethro274 said:

It’s cold in Texas this week as y’all know. I have had my truck plugged in but it is outside under a carport. I went to start it today and it had a check engine light on. I thought it was just cold so I have left it at idle for a while to warm up. When I tried to move it beyond a slow idle it will die. OnStar ran a diagnostic and it shows P018B for the fuel pump. My truck only has 2900 miles and the tank is full. Could the cold we have be experiencing have anything to do with it? Thick Diesel?

 

 

Edit: There is also a high pitched wine/whistle coming from under the fuel tank, it sounds like.

 

Sent from my iPhone using Tapatalk

Most definitely, if you guys don't have #1 diesel down there for winter. More than likely not. Just #2.

 

If you can get a heat source blowing on the fuel tank and filter,  and get it to operating temp, the filter has coolant lines going to the filter. Will help from gelling up, but sounds like your too late. If your filter is gelled up already, change filter. Add howes anti gel or what ever you can find down there. Double up on amount. Add it to every tank. Truck should have a little black funnel.

 

There is a product, diesel 911 that is suppose to de gel a system. Haven't had much luck with it.

 

Welcome to the North.

[Terpracer]

I’m having the same issue today. What was your final solution?

[GMCustomerService]

On 12/24/2022 at 6:36 PM, Terpracer said:

I’m having the same issue today. What was your final solution?

This is certainly not what we like to hear, Terpracer.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your truck. To do so, please send an email to [email protected] with ATTN: Terpracer/GM Trucks in the subject line.

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