PO651

LTWOEAGLE

MEMBER
2009 CHEVROLET COBALT
149,000 MILES

I've got a 09 chevy cobalt w/2.2 and it pulled a code PO651 that reads sensor b voltage regulator open, what does that mean? Could that be the trottle body position sensor or the pedal position sensor?

Monday, May 13th, 2013 AT 10:08 PM

2 Replies

HMAC300

MECHANIC
48,601 POSTS

This is an internal thing in the pcm and it has to be done by a pro with a pro type scanner because there are 5 items hooked to the one. Each has to be unplugged and looked at by the scanner to see which Is screwing up if at all. When the falutly voltage readiing is found then it can either be a shorted wire, connection or sensor

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Tuesday, May 14th, 2013 AT 5:59 AM

BAKY

MEMBER
1 POST

The same time happened to my Chevy combat 2009. Driving and lost power pulled over. Yelled at car then it started got me to shop. Code came up po651. Pit stop could not do any more for me. Car got me home next day car made it rpms good for awhile then lost rpms for 8 hours then fine again. Wtf?/?
Baky

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Monday, June 1st, 2015 AT 9:58 AM