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Phillip H
Phillip H, ASE Certified Technician
Category: Vauxhall
Satisfied Customers: 330
Experience:  Vehicle Technician at Richmond Motor Services
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Speedometer not working

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Speedometer not working
Customer: replied 14 days ago.
When turning engine on the dashboard goes into calibration mode for a while. After calibration everything works fine except the speedometer doesn't work

Hiya

The speedometer obtains its reading by one of the following depending on vehicle model:


  1. Speed Sensor located at rear of Transmission Assy.

  2. Signal from ABS Module

You should initially have a full diagnostic code read carried out to determine if there are any codes present.  From there a diagnostic path can be established.

If it is a Speed Sensor this will be a 3 wire connector which should be Live, Earth and Signal.

If it is the Signal from ABS Module you would need to look at the Signal wire and determine if there is any reading by using an oscilloscope.

Regards

Phillip

Customer: replied 14 days ago.
Is there a sensor on the gearbox

Hiya

As above it will either be:


  1. Speed sensor located on rear of Transmission Assy

  2. Signal from ABS module

This will depend on what model yours is.  The easiest way to tell is to look at the rear of the Transmission Assy in the area just above where the Driveshafts enter and see if there is a sensor these with a 3 wire connector to it.  If there is then you have Option 1.  If there is nothing there but a blanking plate then you have Option 2!

Regards

Phillip

Phillip H and other Vauxhall Specialists are ready to help you
Customer: replied 14 days ago.
Thanks

Hiya

No problem at all.

Regards

Phillip