2003 GMC Sonoma SES light is on but the code reader doesnt

2003 GMC SONOMA
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CHASESONOMA
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Electrical problem
2003 GMC Sonoma 6 cyl Two Wheel Drive Automatic

I have a 2003 GMC sonoma with 91,000 miles on it and the Service engine light is on and is steady on I took it to Advance Auto and they couldn't get any code to come up in thier reader. So I took it to one of the local repair shops to see what they could do about it and their reader came up with nothing as well. I check all fuses and gas cap they're good. What could be causing this and how can i turn the light off?
Aug 9, 2009 at 9:24 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Hi there,

You may have to try a factory reader, and if that is no good the ECU will need to tested for a fault itself.

mark (mhpautos)
Aug 9, 2009 at 9:36 PM
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