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When service engine light is on on a 2003 Chevy Trailblazer, the problem could be a faulty thermostat, a circuit range performance problem, or any other problem.
Identifying the problem you're having with it would be a good start.
yes,4 separate bulbs,2high beam-2 low beam
Yes it is 11 years old now.
Possibly the multifunction switch (switch in columm). Check the bulbs, fuses etc first
Does the car have fog lights? I have a 2003 Sunfire that the high beams would not work on. This was caused by a short in the fog light wiring. I had the fog lights rewired separate from the harness (about $100) and the problem was fixed.
A 2003 Chevy Suburban will crank but not start if it has no spark or fuel. Checking for a clogged fuel filter or fouled spark plugs can help to resolve the problem.
Problem with the emission system have vehicle scanned to determine the problem
intermitting problem with no power at drivers door
Check your charcoal fuel canister. I had the same problem changed the light went out. The problem fixed.
P1441 indicates a problem in the EVAP control system.
i had this same problem. it was faulty wiring underneath the battery.