Codes P0300 and P1518

2003 CHEVROLET SILVERADO
125,000 MILES • 6.0L • V8 • AUTOMATIC
Avatar
ARGYEL
  • MEMBER
  • 3 POSTS
Started with reduced power P0300 misfire problem and a freeze frame fuel trim bank 2 of -54% short term -25%. Check data streams and all was normal O2 sensors all normal so I erase codes and start again and get reduced power P1518. Don't know where to look!!
Sep 1, 2021 at 5:56 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good morning,

What are the long-term trims for both banks while running? They are more important than the short-term trims.

I attached the flow chart for you below of the code with steps to follow. In most cases, it is the throttle body that is the issue for both complaints.

https://www.2carpros.com/articles/how-a-throttle-body-works

Roy


Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Sep 2, 2021 at 1:55 AM
Avatar
ARGYEL
  • MEMBER
  • 3 POSTS
Bank 1 was 0 and bank 2 was -1.9.
Sep 2, 2021 at 6:04 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Those readings are correct.

Roy
Sep 3, 2021 at 3:12 AM
Avatar
ARGYEL
  • MEMBER
  • 3 POSTS
Did not address my overall problem!
Sep 3, 2021 at 5:51 AM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
What steps did you follow in the flow charts that I left? The flow chart was very specific in tests that needed to be done.

Roy
Sep 3, 2021 at 10:41 AM