Car in limp mode, codes P0106 and P0651

Tiny
ROGERBA
  • MEMBER
  • 2009 CHEVROLET COBALT
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 186,000 MILES
Car lost power, limp mode, check engine light comes on, tachometer in dash quits working, no throttle pedal, runs rough. Scan car and had a p0106 and p0651. Could this simply be the MAP sensor?
Do you
have the same problem?
Yes
No
Tuesday, June 11th, 2019 AT 8:09 PM

1 Reply

Tiny
KASEKENNY1
  • EXPERT
Hi Rogerba,

It could be a MAP sensor but looking at the codes and the symptoms you have, I suspect you have a 5 volt reference issue. This could be a MAP that shorted and took down your reference signal but either way, I would do some checking on this circuit. The reference circuit does not effect just one system. The P0651 is your 5 volt reference 2 circuit. This is shared by the throttle position which is probably why you lost throttle response. The crank uses this as well which is why you lost the tachometer which forced the limp in mode. The running rough and lose of power was due to the MAP. The PCM uses MAP, MAF, and TP to control air/fuel ratio.

Long story short, I would run through the diagrams just to make sure you don't have a short in your 5 volt reference.

I attached the diagrams for both codes. Let me know what you find. Thanks
Was this
answer
helpful?
Yes
No
Wednesday, June 12th, 2019 AT 10:31 AM

Please login or register to post a reply.

Recommended Guides