2020 Chevy 3500HD 6.6l GAS starting problem

[Ashleet]

for a couple of weeks now my truck would sometimes have a hard time starting to where it would die off. Then it would start and run like nothing, but today it ran fine all day and got home turned off the truck and went to leave again about 30 mins later. Tried to start the truck and it cranked over but died off. I tried a few times and it just cranked. Now the truck won’t even crank at all. Checked the battery and it’s fine. Checked to make sure the gas cap was on good. Ran the codes and I’m getting a bunch different fuel codes  p018b, p0442, p0455 & p2635. Anyone else have this problem???

Edited June 26, 2021 by Ashleet

[newdude]

DTC P0442

Evaporative Emission (EVAP) System Small Leak Detected

DTC P0455

Evaporative Emission (EVAP) System Large Leak Detected

 

DTC P018B

Fuel Pressure Sensor Performance

 

DTC P2635

Fuel Pump Flow Performance

 

Going off the P2635 and the P018B, it could be an issue with the fuel pump in the tank or the pressure sensor that sits in the top of it.  

 

 

[Ashleet]

Thank you. That’s what I was kind of thinking I’m just hoping a local auto parts store has a listing and actually has it in stock. So much parts are out of stock and on back order right now especially from the dealers

[okoilman]

I’m having same problems. 2020 2500 HD Custom. So far truck runs fine, just sends codes like crazy. 
Po121 Throttle/pedal position range perf
P018b Fuel pressure Sensor B Circuit range performance

 

P2635 Fuel pump A low flow Performamce

  It was giving me evap codes but I blew out charcoal canister out and stopped that. Fuel pressure is 38-40 at idle and low 30’s Under some load driving. I suspecting fuel pump getting weak on mine. Just hope I can find one. Local parts stores just laugh. 

[GMCustomerService]

On 7/18/2022 at 6:33 PM, okoilman said:

I’m having same problems. 2020 2500 HD Custom. So far truck runs fine, just sends codes like crazy. 
Po121 Throttle/pedal position range perf
P018b Fuel pressure Sensor B Circuit range performance

 

P2635 Fuel pump A low flow Performamce

  It was giving me evap codes but I blew out charcoal canister out and stopped that. Fuel pressure is 38-40 at idle and low 30’s Under some load driving. I suspecting fuel pump getting weak on mine. Just hope I can find one. Local parts stores just laugh. 

This is certainly not what we like to hear, okoilman.  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 2020 2500 HD Custom. To do so, please send an email to [email protected] with ATTN: okoilman/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
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