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2009 Chevrolet Cobalt Ignition interlock

Tiny
KALYA
  • MEMBER
  • 2009 CHEVROLET COBALT
  • 108,000 MILES
While driving on the fwy at 80mph a light came on that said engine reduce power then traction loght and check engine light came on. After I parked the car for a few hours the all the lights including check engine light turned off but this problem continues to gappen when I reach a speed around 80mph.
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Saturday, July 13th, 2013 AT 10:30 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
When this happens and the lights are on, take the vehicle to a nationally recognized parts store and have them scan the computer for codes. It should indicate where the problem is coming from.
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Saturday, July 13th, 2013 AT 8:20 PM
Tiny
KALYA
  • MEMBER
  • 2 POSTS
The code it reads is p0641
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Monday, July 15th, 2013 AT 12:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
P0641 Sensor Ref Voltage A Circ/Open

That is the only info I can find on this code. It is extremely vague
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Monday, July 15th, 2013 AT 8:42 PM

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