1. Diagnose the Specific Problem:
The P0500 code is very general. The *actual* problem could be several things:
* Faulty Vehicle Speed Sensor (VSS): This is the most common culprit. The sensor itself might be failing, producing intermittent or incorrect signals.
* Wiring Issues: Broken, corroded, or shorted wires between the VSS and the PCM (Powertrain Control Module) can interrupt the signal. This includes connectors.
* Faulty PCM: While less common, a malfunctioning PCM can also cause this code. This is usually diagnosed *after* other potential issues are ruled out.
* Transmission Problems: In some cases, problems within the transmission itself (like a faulty output speed sensor on automatic transmissions) can affect the VSS signal.
* ABS Sensor Issues (rare): In some vehicles, the ABS system shares information with the PCM that contributes to vehicle speed calculation. A faulty ABS sensor might, in some rare cases, contribute to a P0500 code.
2. Troubleshooting Steps:
* Visual Inspection:
* Locate the VSS (usually on the transmission). It's a small sensor with a single or multiple wire connectors.
* Carefully inspect the sensor for physical damage, loose connections, or corrosion. Pay close attention to the wiring harness leading to and from the sensor.
* Clean any corrosion you find with electrical contact cleaner.
* Check the Wiring:
* Disconnect the VSS connector and visually inspect the wires for breaks, chafing, or damage. Use a multimeter to check for continuity between the sensor and the PCM connector. Refer to a wiring diagram for your specific year and model Voyager.
* Check the connector itself for corrosion or broken pins.
* Test the VSS (if possible):
* This often requires a multimeter and specialized knowledge. The test involves checking the sensor's resistance and voltage output while the vehicle is running (or possibly simulating a wheel rotation). You'll need a wiring diagram and potentially a service manual to perform this test correctly.
* If you're not comfortable with this step, skip it and proceed to professional diagnosis.
* Check the Transmission Fluid (Automatic Transmissions): Low or dirty transmission fluid can affect sensor performance.
* Check for other trouble codes: A scanner can often reveal additional codes that provide clues to the root cause.
3. Repairing the Problem:
* Replace the VSS: If the sensor is faulty or the wiring is damaged beyond repair, you'll need to replace the VSS. This usually involves disconnecting the connector, removing the sensor, and installing the new one. Torque specifications are crucial; use a repair manual.
* Repair Wiring: Repair or replace damaged wiring. Solder and use heat shrink tubing for durable repairs.
* PCM Replacement (rare): If all other components check out, the PCM might be faulty. This is an expensive repair, best left to a qualified mechanic.
* Transmission Repair (rare): If the problem stems from the transmission, professional repair is necessary.
4. Clear the Code: After making any repairs, use an OBD-II scanner to clear the code and test-drive the vehicle to see if the code returns.
Important Considerations:
* Vehicle Year and Model: The location of the VSS and the specifics of the repair will vary slightly depending on the exact year and model of your Plymouth Voyager.
* Safety: Working on a vehicle can be dangerous. Disconnect the battery's negative terminal before starting any electrical work.
* Professional Help: If you're not comfortable performing these repairs yourself, take your Voyager to a qualified mechanic for diagnosis and repair. Incorrect repairs can lead to further damage or safety hazards. A professional will have the tools and expertise to accurately diagnose and fix the problem efficiently.
This detailed guide should help you approach repairing the P0500 code. Remember safety and proper procedures are crucial when working on your vehicle's systems. Consult a repair manual specific to your Plymouth Voyager's year and model for detailed diagrams and specifications.
