2003 GMC Sierra oil pressure light comes on

2003 GMC SIERRA
100,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
LEOJA
  • MEMBER
  • 3 POSTS
took vehicle in due to oil pressure signal,replaced oil
pressure sensor. Signal came back after about a week. was suggested to replace oil pump, then told engine had sludge. Regular oil changes were done on vehicle. Do you have any suggestions as to problem?
Signal seems to come on only after highway driving.

Thanks
May 25, 2010 at 9:39 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
BLUELIGHTNIN6
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 16,542 POSTS
are you using the proper weight of oil? also an engine oil flush would not hurt, there could be sludge built up. oil pump is possibly becoming weak and failing as well, but you would normally hear some noises due to lack of oil in engine.
May 25, 2010 at 9:45 PM
Advertisement
Avatar
LEOJA
  • MEMBER
  • 3 POSTS
what would be the proper oil weight? I have been using 5 30
May 25, 2010 at 9:54 PM
Avatar
BLUELIGHTNIN6
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 16,542 POSTS
Your engine was designed to use SAE 5W30 oil so that would not be the problem.
May 25, 2010 at 10:06 PM