Question about 2004 Chevrolet Colorado

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Abs fault after replacing front rotors on 2005 colorodo 4x4 abs light on after 25 mph scan says right front is sensor bad or does it need to be adjusted and cleaned no problem before this

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  • gmservicecen Feb 12, 2009

    abs activates at touch of brake pedal, tech n2 says right front speed sensor circuit , replaced hub and sensor, BIG JOB.. nochange, replaced harness with direct conection to the ebcm, still no change, wave pattern all over the board, plot on tech 2 shows rt frt sensor cutting out, coo40 and co221... Stand alone Mamp reading when wheel is rotated falls into SI,s parameters LOW 4to6mamp and high 8to16,. , maybe connection to ebcm, that was replaced as well.. thanks in advance.

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I bet the sensor has been bumped out of place or the connection was disturbed. No question the first things to check

Good Luck

Posted on Feb 08, 2009

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Abs on vr commodore light stays on solutions


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So here it is. For those of you familiar with checking the engine error codes, this procedure is so simple its not funny.

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33 Right hand rear wheel speed sensor continuity fault
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55 Rear inlet solenoid valve circuit fault
56 Rear outlet solenoid valve circuit fault
61 Pump motor relay circuit fault
63 Valve relay circuit fault
71 ABS control module internal fault

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Ok, so I replaced both front rotors and brakes and the rear set of pads because I was getting a really bad squeal and grinding noise. I found a stuck caliper pin and lubed that till it slid smoothly. But...


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