2007 Malibu 3.5 - speedometer does not work & tranny shifts rough after head gasket job

Tiny
ABOMAXX
  • MEMBER
  • 2007 CHEVROLET MALIBU
  • 84,368 MILES
After doing a complete head gasket job on my '07 Malibu, the speedometer does not work and the transmission shifts rough. Is this a PCM problem or something got disconnected? The engine runs well. Is this something that I can troubleshoot at home?
Thursday, July 25th, 2013 AT 3:51 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It sounds like the vehicle speed sensor (VSS) was disconnected or damaged. Check that. Also, if the check engine light is on, have the computer scanned for possible transmission trouble codes.
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Thursday, July 25th, 2013 AT 9:20 PM
Tiny
ABOMAXX
  • MEMBER
  • 3 POSTS
Thanks! Your diagnostic was 100% correct. The speed sensor was disconnected and I hooked it back up first thing today. She is now shifting smooth and the speedometer is fully operational.
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Friday, July 26th, 2013 AT 12:59 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Glad I helped. Take care and let us know if you have questions in the future.

Joe
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Friday, July 26th, 2013 AT 6:45 PM

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