Speedometer not working fuel gauge not accurate

  • 1 POST
  • 3.3L
  • V6
  • FWD
  • 110,000 MILES

The speedometer just stop working after the ignition two fuse blew and the vehicle shut down. The fuel gauge has been inaccurate ever since.

Do you
have the same problem?
Saturday, November 19th, 2016 AT 7:07 PM

1 Reply

  • 29,781 POSTS

Do you mean the speedometer is stuck on "0"? If so, look closely at the pointer to see if it is on the backside of the little stop peg. Often the pointer will jump when power is restored, as in reconnecting the battery, or replacing a blown fuse. This is not a spring-loaded gauge like we had in the past. It is a "stepper" motor that is placed to the desired position by pulsing it with varying voltage and polarity. When it jumps past half way, when it is turned on the next time, it looks for the shortest way back to "0", and that may be clockwise. That's when it goes the wrong way and gets stuck.

There's three ways to reposition the pointer. One is to remove the dash cover and push it counter-clockwise by hand. The second is to use a scanner to perform the gauge test procedure. That runs each gauge to 1/4, 1/2, 3/4, and max, then back to "0". The pointer will bounce to the 3/4 mark, then continue to follow the commands and go back to '0".

The third, and easiest method is to simply drive faster than half scale until the shortest way to the current speed is for the pointer to go counter-clockwise. For example, if the maximum reading on the speedometer is 120 mph, drive a little faster than 60 mph. The pointer will jump to the correct speed, then continue to read correctly. Keep in mind that while 120 might be the highest number on the scale, the pointer will have gone considerably further than that, so you may need to drive a lot faster than 60 mph.

You have to be more specific with the fuel gauge than "inaccurate".

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Sunday, November 20th, 2016 AT 2:56 PM

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