4x4 service light on

2003 CHEVROLET ASTRO
79,000 MILES • 6 CYL • 4WD • AUTOMATIC
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WENDYENGLERT
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I have a 2003 Blazer the encoder motor for the 4x4 is bad. Is there more then one encoder motor for this year and do I have to have it programed by a GM dealership?
Apr 1, 2011 at 10:03 PM
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RASMATAZ
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2003 Chevrolet Astro 4x4 service light on

https://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
Apr 1, 2011 at 11:49 PM
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WENDYENGLERT
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already have the code... P0308 motor A/B Ckt open they ran diagnosis and found encoder motor open
Apr 2, 2011 at 4:59 PM
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RIVERMIKERAT
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According to my reference, the P0308 code is a short to ground on either A or B motor control circuits. You will need to find where the short is and fix it. Look for frayed wires and missing insulation.
Jun 14, 2011 at 4:39 AM