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Why has my heater, AC and speedometer stopped working and why is my check engine light on

Tiny
DINOWV
  • MEMBER
  • 2003 DODGE RAM
There is no power going to my heater controls, and my speedometer doesn't work but my tachometer does and my check engine light is on and all of this started around the same time after the drivers side door was replaced
Monday, October 10th, 2011 AT 3:11 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The speedo could be a speed sensor issue. That could turn the check engine light on. Have the computer scanned to identify the trouble code. As far as the heater control, check fuses.

Most parts stores will scan the computer for free, so have that done and let me know what you find.
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Monday, October 10th, 2011 AT 4:56 PM
Tiny
DINOWV
  • MEMBER
  • 5 POSTS
I have checked all fuses and relays and speed sensor has been replaced.
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Monday, October 10th, 2011 AT 5:26 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Were you able to get trouble codes from the computer?
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Monday, October 10th, 2011 AT 5:44 PM
Tiny
DINOWV
  • MEMBER
  • 5 POSTS
No
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Monday, October 10th, 2011 AT 5:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Is the check engine light still on?
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Monday, October 10th, 2011 AT 5:52 PM
Tiny
DINOWV
  • MEMBER
  • 5 POSTS
Yes the check engine light is still on along with the abs, and brake light and the heat is stuck on vent but there is no power going to controls and all of this started at the same time.
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Monday, October 10th, 2011 AT 6:06 PM
Tiny
DINOWV
  • MEMBER
  • 5 POSTS
And just so you are aware, the heater doesn't blow hot or change from the vent to anywhere else.
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Monday, October 10th, 2011 AT 6:27 PM
Tiny
IFNOT1PROBLEMITS2MORE
  • MEMBER
  • 2 POSTS
Control module located on outside off fuses. U can get one from junk yard but it has to be same year. Its mounted to out side fuse box
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Wednesday, October 12th, 2011 AT 2:20 AM

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