How do I calibrate my truck speedometer?

Press and hold the calibration button located on the speedometer, start the vehicle, and then release the button. Press that button again and then take the test drive. Once you have driven the distance needed, press the button once more and the speedometer will calibrate itself to accommodate the new tire size.

How do I get my speedometer calibrated?

Identify the speedometer calibration button and press-hold, crank your vehicle and then release the button. Push the button and drive the distance recommended by the manufacturer. After driving, press the button again, and the speedometer will automatically calibrate itself.

How much does it cost to have a speedometer calibrated?

Getting a Speedometer Calibrated Most auto-mechanics perform speedometer calibrations, and some driving schools perform them as well. The cost is usually approximately $75.

How do I reprogram my speedometer for bigger tires?

Press the button again and drive the distance prescribed by the speedometer manufacturer. Press the button a third time after you have driven the designated distance. After pressing the button the third and final time, the speedometer will recalibrate itself to fit the new tire size.

How do I know if my speedometer is accurate?

If you think your speedometer is inaccurate, you can use a stopwatch to check how accurate it is. Start the watch as you pass a mile marker while on the highway, and then stop it once you pass the next marker. The second hand on your stopwatch will be your speed.

Does putting bigger wheels on your car affect the speedometer?

You might ask: do bigger tires make your speedometer faster? The answer is no. Tire size and speedometer accuracy are directly linked to each other. Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed.

Why is my speedometer not accurate?

Reasons why your speedometer is inaccurate Damaged wiring or a blown fuse could be enough to through the speedometer out of whack. A malfunctioning sensor or engine control unit could be reporting an erroneous speed. A change in wheel or tire size could even throw off the senor and its calculations.

How much does a calibration cost?

The cost of a calibration varies, but expect to pay between $250 and $400. Specialty retailers might charge more or less depending on the complexity of the TV, if you want additional HDR calibration, if you want them to calibrate multiple picture modes, and other variables. Is this worth it for you?

How often should speedometer be calibrated?

In general, you should consider calibrating your speedometer if you are charged with a speed that is within three or four miles per hour of a couple critical marks: The reckless driving limit. Reckless driving is any speed over 85 mph or any speed that is 20 mph over the speed limit. The jail range.

Are Bigger tires bad for your truck?

Tires are essential to your truck’s performance and safety. A larger tire size can make your truck look and perform better in some situations. But changing tire size too much can affect speedometer and odometer accuracy, handling, steering response as well as safety issues such as tire load capacity.

How much can a speedometer be off?

How accurate are speedometers? Dan Edmunds, an automotive engineer and the director of vehicle testing at, says that speedometers cannot have an error of more than 5 percent (typically expressed as plus/minus 2.5 percent relative to the actual speed) according to federal law.

When to use a Hypertech speedometer calibrator?

If you’ve installed tires that are larger or smaller than original equipment tires, or if you have installed a ring and pinion gear set with a different rear gear ratio, Hypertech Speedometer Calibrator allows you to re-program for correct speedometer readings, as well as correct part-throttle shifting.

Is the speedometer on a stock car calibrated?

The speedometers on stock vehicles are calibrated for use with the vehicle’s stock parts.

What causes the speedometer to go off when you change a tire?

Changing the stock parts, including the vehicle’s tires, can throw off the speedometer calibration; larger tires cause the speedometer to read a speed slower than the vehicle’s actual speed while smaller tires cause the speedometer to read a speed faster than the vehicle’s actual speed.

How big is a 21 ” speedometer tire?

Speedometer Calibration Tire Size Chart for 13″ Wheels 21″ Tire Diameter 185/60R13 = 21.7×7.3R13 215/50R13 = 21.5X8.5R13