P0452

tjrado · July 21, 2020

About a week and a half ago, I got a check eng light. My reader indicated it was P0452 G MIL set and another pending. Evap Emission Sys Press Sensor Low. I cleared the code and it comes back within seconds. Cleared again and had the wife hold the gas cap tight past the one click. Didn't come back, but showed on the reader as pending, so I got a new OEM cap P/N 22921366. Cleared codes again and got a nearly immediate check eng, P0452. I ordered the Emission Low Press Sensor AC Delco 13502903, will have this Friday, I'll let you know how that turns out. At least in the meantime, it does not affect the performance of the truck.

babyj713 · July 22, 2020

3 hours ago, tjrado said:

About a week and a half ago, I got a check eng light. My reader indicated it was P0452 G MIL set and another pending. Evap Emission Sys Press Sensor Low. I cleared the code and it comes back within seconds. Cleared again and had the wife hold the gas cap tight past the one click. Didn't come back, but showed on the reader as pending, so I got a new OEM cap P/N 22921366. Cleared codes again and got a nearly immediate check eng, P0452. I ordered the Emission Low Press Sensor AC Delco 13502903, will have this Friday, I'll let you know how that turns out. At least in the meantime, it does not affect the performance of the truck.

I had this same issue. It was literally a sensor on the gas tank. Easy fix. My extended warranty covered it. Hope it works for you.

tjrado · July 22, 2020

19 hours ago, babyj713 said:

I had this same issue. It was literally a sensor on the gas tank. Easy fix. My extended warranty covered it. Hope it works for you.

Me too, I believe I can do this without dropping the tank. Guess I'm gonna find out.

tjrado · July 24, 2020

Ok, it's Friday, so much for the guaranteed Friday delivery from the postal service, whenever they get around to it, I'll install it.

tjrado · July 27, 2020

My sensor was delivered on Saturday and I didn't have a chance to replace it till this morning.

Short story, it fixed it.

Long story, You can change the sensor out without having to do any removal of additional parts. I used a creeper, good small flashlight, a mirror, flat head screwdriver, and a couple of wet paper towels to clean around the sensor before removing. I popped it out with the screwdriver and there was enough harness to move it between the drive shaft and the tank for easy switch out. GM parts was definitely not at fault on this issue, I remember a couple weeks ago seeing a squirrel run out from under my truck when I was walking up to it and remote started. I live in the country, I think now, it's squirrel season year round.