Speedometer Jumps From 25 to 30 When First Starting Out and Then It Does Not Do It Again When Drive

One of the most inconvenient things that tin happen to your F150 is when the speedometer stops working.  You don't really realize how much you wait at the thing until information technology's simply always sitting at 0 MPH while driving down the road.

If your Ford F150's speedometer is non working, information technology'due south unremarkably going to be caused past an upshot with the VSS (vehicle speed sensor), or a bad ECU.  The VSS is usually not very expensive, and they are not that hard to supervene upon.

Vehicles used to use a cable that would usually run from the tail shaft of the transmission to the speedometer.  There was a physical/mechanical connexion between the drivetrain and the speedometer.

Instead of this direct connection, a modern vehicle uses the vehicle speed sensor and relays that information to the speedometer.  The VSS is one part of a system of sensors that helps keep you safe (traction control, ABS, cruise control).

Speedometer Not Working Causes:  Ford F150

A modernistic vehicle'due south speedometer takes the input from the Vehicle Speed Sensor and sends that data to the ECU.  The ECU is programmed with your F150'southward gear ratios and stock tire height.  Information technology combines this data to ship the speed reading to the instrument cluster.  The causes of a bad speedometer volition typically exist found in these four things:

A typical VSS

• VSS–  A faulty speed sensor will oftentimes exist accompanied past the P0500 (VSS excursion malfunction) trouble lawmaking.  The speed sensor does more but control the speedometer, it also helps to control the prowl control organization and may even bear upon the mode that the engine runs. If the service engine soon light is on, then cheque the trouble code with an OBDII scanner.  If you don't accept a scanner, take information technology to the local parts store and have them run information technology for you.
• Wiring Issues–  Exposed wiring to or from the VSS tin crusade your F150'due south speedometer to no longer work.  This will often manifest itself later driving through heavy water.  It's worth checking to encounter if the fuse has blown.  If it has, just exist enlightened that it will eventually accident again without addressing the cause of the problem.  Here's a corking guide on how to diagnose a wiring brusque in almost any vehicle
• ECU–  Your F150'southward Engine Control Unit (ECU for short) is the figurer that takes all of the information that the vehicle sensors compile and uses it to control the vehicle systems, and sends important vehicular telemetry data to the driver via the instrument cluster.  If there is something wrong with the ECU, it may no longer exist able to send the speed telemetry to the instrument panel.  This i is a possibility if in that location are no VSS related problem codes, but taking a look at the wiring would exist a better place to get before taking a await at the ECU.
• Speedometer Itself–  The odds of the speedometer going out all past itself, while the residuum of the gauges continue to work are not great.  Most of the fourth dimension if the speedometer is out, it means that in that location is a bigger problem with the unabridged instrument cluster.  Do all of the other gauges work?  If aye and then, the trouble is probably not in the speedometer, simply the signal going to information technology.  Other gauges went out also?  Ok, looking at the musical instrument panel and ECU are going to exist where to start.  Instrument console starting time.

F150 Speedometer Not Working Diagnosis

If your Ford F150's speedometer is not working, the first place to go would exist to check the service engine soon light (if applicable).  At present, accept it out and see if the cruise command however works.  If it does, that'south a pretty good indication that the vehicle speed sensor is just fine.  If information technology doesn't, it's time to take a wait at it.

After testing the cruise control, y'all would desire to move on to the VSS and the wiring going to and from information technology.  Before sticking your head nether the vehicle, cheque to run into if the fuse going to the VSS is accident.  If it is, replacing it may temporarily restore your F150's speedometer, just that doesn't fixwhy the speedometer stopped working.  If everything however checks out, it's fourth dimension to movement on to the ECU.

Conclusion

Driving without a speedometer can be somewhat dangerous and off putting.  We recommend using a speedometer app. They utilize the GPS built into your smartphone to give a very authentic speed reading.  Yous can throw it on your dash until you lot get it fixed.  Practiced luck fixing your F150's speedometer!  If at that place is anything that you would similar to add, please feel gratis to leave a comment below.

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Source: https://www.700r4transmissionhq.com/ford-f150-speedometer-not-working/

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