This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.
P1500 is an OBD-II Code that refers to Vehicle Speed Sensor Intermittent
A P1500 code is a manufacturer specific diagnostic trouble code that occurs with Ford and related makes and vehicles when the ECM/PCM detects a problem with the vehicle speed sensor (VSS). The VSS monitors the speed of the vehicle and sends a signal to the computer. The computer then uses this information to control things like fuel injection and ignition timing.
The code P1500 is set and stored when the computer detects that the VSS signal is missing or intermittent.
Common causes for this code include:
- Malfunctioning Vehicle Speed Sensor
- Open or shorted Vehicle Speed Sensor harness
- Poor electrical connection Vehicle Speed Sensor
- Faulty PCM (Rare)
The symptoms of a P1500 code are:
- Illuminated Check Engine Light
- Improper function of the speedometer
- Various issues at varying speeds
- Vehicle may enter limp mode
- Loss of power at low motor loads
- Erratic Transmission shifts
To diagnose a P1500 DTC code, a technician would:
- Scan for codes in the ECM and look at the freeze frame data for failure.
- Visually inspect the wiring and connectors for any damage or loose connections.
- Test the output of the Vehicle Speed Sensor with a lab scope or multimeter.
- Check for proper ground at the vehicle speed sensor connector.
- Compare the output from the vehicle speed sensor to other vehicles of the same make and model in order to verify normal operation.
The following are some of the most common mistakes that a technician may make when diagnosing a P1500 code:
- Not thoroughly inspecting all the wiring and connectors for damage or loose connections
- Not testing the vehicle speed sensor output with a lab scope or multimeter
- Failing to check for proper ground at the vehicle speed sensor connector
How serious is this?
A P1500 code is a serious code that should be addressed as soon as possible. This code can cause erratic transmission shifts, power loss at low motor loads, and various issues at varying speeds. The vehicle may also enter into limp mode, which will limit its speed and performance.
What repairs can fix the code?
The following are solutions that may fix this problem:
- Broken or faulty wirings must be repaired or replaced as needed
- All connectors must be inspected for damage or loose connection and repaired or replaced as needed
- The vehicle speed sensor output should be tested with a lab scope or multimeter and, if necessary, replaced
- The proper ground should be checked at the vehicle speed sensor connector
A P1500 is related to and may be accompanied by the following codes:
P0110 – P0115: Intake Air Temperature Sensor
P0100 – P0105: Mass Air Flow Sensor
P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
P0720: Output Shaft Speed Sensor Circuit No Signal
P0722: Output Shaft Speed Sensor Circuit No Signal 2
In conclusion, the P1500 code is a diagnostic trouble code that refers to a problem with the vehicle speed sensor. This code can cause various issues at varying speeds, power loss at low motor loads, and the vehicle may enter limp mode. The most common mistake made when diagnosing this code is failing to properly inspect all the wiring and connectors for damage or loose connections, not testing the vehicle speed sensor output with a lab scope or multimeter, and not checking for proper ground at the vehicle speed sensor connector. Always remember to follow the manufacturer’s recommendations when performing repairs.