The speedometer cable, which is linked to the speedometer in the dash and runs through the gearbox, follows a curved route and should have few or no bends or kinks especially in the ends. The cable, powered by the drive shaft, turns a magnet that creates an eddy current. The circular current rotates the speed cup, which tightens the hair spring. As the hairspring tightens, a pointer on the dial turns and indicates the speed. A defective or broken speedometer cable causes the vehicle’s speedometer to register the wrong speed or stop working entirely.
Facts to Note:
Other problem areas may cause the speedometer to malfunction.
You should have your expert mechanics examine all speedometer-related elements such as the sensor and drive.
How to Fix:
The vehicle battery is disconnected then the vehicle is lifted and held on jack stands. Accessories are removed to access the cable inside and out as required.
The faulty speedometer cable is disconnected from the speedometer and the transmission.
The new speedometer cable is fixed and connected to the transmission and speedometer.
All the removed accessories are reinstalled. The vehicle is removed from jack stands and the battery is reconnected.
The vehicle is road tested to ensure proper operation of the speedometer.
There are many potential causes of a defective speedometer cable. A thorough check of all speedometer-related parts is necessary to determine the problem’s source. When checking the speedometer cable, your expert mechanics will examine the routing of the cable, detect any damage such as fraying or kinking, and test the connections on both ends. If the cable is frayed or kinked it will need to be changed and if gearbox oil has seeped into the cable and made its way to the speedometer the speedometer will need to be changed.
Broken drives, faulty speedometer sensors, and deterioration of the cable’s ends are all common causes of cable malfunctioning. No matter the problem, your expert mechanics will perform a diagnostic check on the vehicle to pinpoint the exact source of speedometer-related troubles.
Common symptoms indicating you may need to change the Speedometer Cable:
Speedometer needle drops repeatedly while driving at slow speeds
Speedometer needle vibrates or behaves intermittently at high speeds
Speedometer squeaks and squeals at high speeds
Check Engine Light indicates a faulty speedometer sensor
Importance of this service:
Ignoring a defective speedometer cable can cause the speedometer to behave intermittently or stop functioning completely over time. Contact your expert mechanics when you first notice problems with the speedometer cable to stop further problems, such as receiving costly tickets because of inaccurate speedometer readings.