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Re: 1988 Dodge D150 Erratic Speedometer
Unscrew the speedometer cable from the back of the gauge and from the transmission, take the cable out of the sheath, clean it off with carb or brake cleaner, oil it and put it back in. If that doesn't do it, replace cable assembly. If that doesn't do it, pull the speedometer gear out of the transmission and check for wear. Replace if needed.
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Code 15 relates to a failure in the vehicle speed sensor circuit. The job of the vehicle speed sensor is to inform the computer about the speed of the vehicle so the computer can calculate engine load and prepare the engine idle speed control system while the vehicle is decelerating. On deceleration, the idle speed control system will allow additional air flow into the engine as the vehicle rolls to a stop. Usually code 15 will be accompanied by erratic speedometer readings (or no reading), erratic AT gear shifting, TCC lockup clutch instability, and intermittent or complete failure of the cruise control.