Question about Cars & Trucks

1 Answer

04 f150 heritage speedo moves but not over 10 mph and trans won't shift gears. i changed all sensors,traced all wires.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 15,575 Answers

Taking your vehicle to a qualified reair shop to have it diagnosed would be a good thing to do . You could not have traced all wires ! Because i'm sure you haven't any idea how this works . An a factory scan tool is a must to diagnose this .Do you know what ford SCP data network is ?
The instrument cluster receives the vehicle speed signal from the powertrain control module (PCM) over the standard corporate protocol (SCP) network and displays it on the speedometer gauge. If the instrument cluster receives no vehicle speed signal after one second, the speedometer defaults to 0.0 km/h (0.0 mph).

Vehicle Speed Sensor
The vehicle speed sensor (VSS) (Figure 52) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

P0500 - Vehicle Speed Sensor (VSS) Malfunction Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), the transfer case speed sensor (TCSS) or the anti-lock brake system (ABS) control module. If the engine RPM is above the torque converter stall speed (automatic transmission) and the engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient vehicle speed data input, a malfunction is indicated and a DTC is set. On most vehicle applications the malfunction indicator lamp (MIL) is triggered when this DTC is set.

  • Open in the VSS+/VSS- harness circuit.
  • Open in the TCSS signal or the TCSS signal return harness circuit.
  • Short to GND in the VSS harness circuit.
  • Short to GND in the TCSS harness circuit.
  • Short to PWR in the VSS harness circuit.
  • Short to PWR in the TCSS harness circuit.
  • Damaged drive mechanism for VSS or TCSS.
  • Damaged VSS or TCSS.
  • Damaged wheel speed sensors.
  • Damaged wheel speed sensor harness circuits.
  • Damage in the module(s) connected to the VSC/VSS circuit.
  • Open or short in the vehicle speed circuit VSS signal between the ABS VSS signal output and the VSS signal inputs to the PCM and other modules (Excursion and F-Super Duty).
Monitor the VSS PID while driving vehicle. This DTC is set when the PCM detects a sudden loss of vehicle speed signal over a period of time. If vehicle speed data is lost, check the source of where the vehicle speed input originates from: VSS, TCSS or ABS. Note: On some MSOF applications, VSS and TCSS PID can be monitor. However if no TCSS PID is available and VSS PID is zero, TCSS circuitry frequency must be checked for loss of sensor signal. If another vehicle electronic module has generated the P0500 and the vehicle does not receive its vehicle speed input from one of the above mention sources (VSS, TCSS or ABS). Check the PCM for Output Shaft Speed Sensor (OSS) DTCs. On OSS applications the PCM uses the OSS to calculated the vehicle speed. If no OSS DTCs are found check for correct PCM configuration. Check PCM configuration for correct tire size and axle ratio. P0501 - Vehicle Speed Sensor (VSS) Range/Performance Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. This DTC is set the same way as P0500, however the malfunction indicator lamp (MIL) is not triggered.
  • Refer to possible causes for P0500.
Refer to Diagnostic Aids for P0500. P0503 - Vehicle Speed Sensor (VSS) Intermittent Indicates poor or noisy VSS performance. Vehicle speed data is received from either the vehicle speed sensor (VSS), the transfer case speed sensor (TCSS), or the anti-lock brake system (ABS) control module.
  • Noisy VSS/TCSS input signal from the radio frequency interference / electro-magnetic interference (RFI/EMI) external sources, such as ignition components or the charging circuit.
  • Damaged VSS or driven gears.
  • Damaged TCSS.
  • Damaged wiring harness or connectors.
  • Malfunction in the module(s) or circuit connected to the VSS/TCSS circuit.
  • After market add-on.
Monitor the VSS PID while driving the vehicle. Check for intermittent vehicle speed indication. Verify the ignition and charging system are functioning correctly.

Posted on Mar 25, 2017


1 Suggested Answer


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

I installed a transmission from a 2003 F150 4.2 into my 2004 F150 heritage 4.2. The trans pulls great but will not shift and although I know I'm going much faster my speedometer only shows up to 15mpg. Of...

If the trans is different from the one you pulled out, you're going to have to take your truck to the dealer to have your ECM flashed for the transmission.
If you don't think this is the problem, then more than likely you're not shifting out of second because you're wiring is broke somewhere and NOT communicating from the trans to the ECM / ECU/ PCM, whatever lingo you use.

Sep 20, 2017 | Cars & Trucks

1 Answer

Switching gears from 1st to 2nd

there is a computer that controls your rpm gauge, your speedo, and your shift. check that and your speed sensor. the sensor is faster and easier.

Jul 26, 2009 | 2004 Nissan Maxima

1 Answer

I have a 1990 Accord EX. The S light is on. I have changed the transmission fluid and the trans will only shift manually. The car sat for 2 years and I have it up and running. Any ideas how to get the...

I have a 91 Accord. The speedometer started going wild, 30 mph. 75 mph and I was at a stop finally quit working and the S light came on. I finally changed the speedo sensor and the S light went off...Check engine light was also on, read on a forum that the speedo sensor does more than control your speedometer, maybe that your trans is not getting the info it needs to shift.....

Jan 21, 2014 | 1990 Honda Accord

1 Answer

1994 chev 4x44l60 trans,np241c tcase,speedo stopped working trans immedeatly stopped shifting past 2 gear


Feb 21, 2013 | Cars & Trucks

1 Answer

I have a vy series 2 ss crewman we changed the auto trans in it today but whilst taking out the old one we broke the speedo wire, we have taped it up out of the way for now but when I took it for a test...

with the more modern cars that have automatic transmissions, the ECM (cars computer) uses the information from the sensors (speedo, and others) to send a signal to the trans to change gears. you will want to splice the wires back together (assuming that the sensor itself did not get broken) if the sensor itself WAS broken off, then you need the replace it.

Nov 20, 2011 | 2004 Pontiac GTO

1 Answer

I have a 1998 Ford F150. The transmission is a 4r70W, automatic. While driving it slipped into neutral and when I managed to get the gears to re-engage, it will only drive in the lower gears. Will not...

Does not matter what your told

You have to diagnose the problem

The TPS may have something to with
shift stratagy & on a 1998 may be worn out
by now, if original. Only testing it will tell
It won't have anything to do with changing gears

Torque Converter Clutch you can feel
separate from shifting
If you ride the brake pedal, you disengage TTC
Lock-up & pick up a few rpm

If the trans is all original, just pull it & rebuild it

If has been replaced, you could clean the valve body
& work on checking out the shift solenoids

Jun 13, 2011 | 1998 Ford F150 Regular Cab

1 Answer

I have a 2002 grand marquis with 373 gears and the computer has been performance programed. my problem is after putting in the gears it has my speed off by 15 mph when i do 55 mph or less but when i do 55...

Never heard of that one. You can change the speedo gear in the trans attached to your vehicle speed sensor. More teeth slow the speedo down. count the teeth on the one in there and see what the dealer has. about $5 each.

Dec 09, 2010 | 2002 Mercury Grand Marquis

1 Answer

Won't shift out of first gear

good diagnosis that is correct if the vehicle speed sensor is not working the speedo doesnt work and the trans doesnt know when to shift

Jul 17, 2009 | 1998 Ford Windstar

1 Answer

96 Taurus Speedo and Trans malf replaced the VSS

could be one of three things 1) could be a bad sensor 2) could be a wiring concern 3) could be a computer concern

Feb 24, 2009 | 1998 Mercury Sable

1 Answer

Speedometer goes to 0 and trans downshifts

There are 2 speed sensors on the transaxle. One is for vehicle speed and one is for trans output shaft speed. My guess is that you replaced the one for output shaft speed.

Nissan Scope Technician- 10 years with Nissan

Oct 26, 2008 | 1999 Nissan Sentra

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

88 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

85206 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

john h

Level 3 Expert

22486 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides