20 Most Recent 2003 GMC Sonoma - Page 4 Questions & Answers

Alcohol in Fuel Test and Reset 2006 Flex Fuel Chevy Impala you need to reset the PCM ,you need to find a guy like this.

check the engine temperature sensor.

The next time it will not start check the fuel pressure, I will bet you have none, the electric fuel pump is affected by temperature due to wear.

On this website, you find fuse box diagram and description for GMC Sonoma (2003 - 2004) GMC Sonoma mk2 2003 2004 fuse box diagram Auto Genius

Nice job in the details except for the make model and year.

Fuel pump relay . Fuel pump electrical circuit diagnosis no fuel pressure testing GM

https://www.google.com/search?q=Location+of+camshaft+position+sensor+on+2001+Mitsubishi+Montero+LIMITED+3.5+ltr&biw=1366&bih=651&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj7-rSW6p_QAhWIRyYKHcseBkIQsAQIHQ#tbm=isch&q=Where+is+S113+in+the+wiring+harness+on+a+2003+GMC+Sonoma+located Hope this helps

You must have the lock cylinder timed incorrectly

Shelia, 2000 gmc Sonoma v/6 Firing order, firing order for the 4.3L engine is 1-6-5-4-3-2. Cylinder order drivers side 1-3-5 and passenger side 2-4-6, Check the attached links,instruction and guides, Good luck "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." 4 3L firing order 1982 2005 Chevrolet 10 Blazer GMC S15 Sonoma Jimmy Chevy Firing Order 2000 gmc Sonoma 6 Firing order Google Search

Sounds like you're going to have to start by getting a tester (if you don't have one already) and check the light sockets for power. AFTER checking fuses. A simple tester like this is all you need; 6 12V Circuit Tester with 12 Ft Lead IF there's no power to the sockets then there should be a connector for the tail/brake lights under the rear of the truck. Check there for power for the lights. If no power then trace the wires along the frame to see if you may find pinched or broken wire(s). Electrical problems can sometimes become a challenge. I try to go about it in a methodical manner and not 'helter skelter'. You've already changed the bulbs so those shouldn't be the problem. Now you need to check where the power stops in the circuit. i hope this helps.