Why a Honda Civic Speedometer Fluctuates

Written by grace pennington
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Why a Honda Civic Speedometer Fluctuates
Speedometer fluctuations can be a sign of a bigger problem. (Polka Dot/Polka Dot/Getty Images)

A fluctuating speedometer can cause you to worry about your safety and your car's fitness for the road. When this problem occurs in a Honda Civic, options exist to help the speedometer get back to stability.

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According to AutomotiveNews.com, a September 2007 recall of more than 63,000 Honda cars -- including Civics -- produced between August 2005 and January 2007 targeted speedometer defects.

Sensor Plug

A Honda Civic's speedometer is made up of a speed sensor plug and a speedometer cable. The plug -- if in the wrong place or needing replacement -- could send the wrong signals to the speedometer. Your mechanic can fix this by replacing the sensor plug. Also, cleaning the idle air control valve helps keep the speedometer from surging.

Cable Connection

The wire for the Civic's speed sensor goes from the alternator to a junction connection, then connects to the fuse block. Hondatech.info states that continual fluctuation of the speedometer can come from problems in the wiring. If this is the case, your mechanic can fix the speedometer by securing the junction connection.

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