C0000 - Vehicle Speed Information Circuit Malfunction

This code indicates that there is a problem with the vehicle speed information circuit, which is used by the power steering control module (PSCM) to determine the amount of steering assist needed.

If you have a car with an electronic power steering system, you may encounter the C0000 code on your diagnostic scanner. In this article, we will explain what causes the C0000 code, how to diagnose it, and how to fix it.

What Causes the C0000 Code?

The C0000 code is triggered when the PSCM does not receive a valid vehicle speed signal from the powertrain control module (PCM) via the serial data circuit. This could be due to:

• A faulty PSCM
• A faulty PCM
• A damaged or loose wiring harness or connector
• A poor electrical connection in the circuit
• A blown fuse or relay

Here are some possible symptoms that you can add to the article:

• The check engine light will be triggered
• Loss of steering power, that is, the steering will become stiffer and more difficult to control.
• Anti-lock Brake System (ABS) warning light
• Dwindling turning radius
• The speedometer begins to malfunction

How to Diagnose the C0000 Code?

To diagnose the C0000 code, you will need a scan tool that can communicate with both the PCM and the PSCM. Follow these steps to perform a diagnosis:

• Connect the scan tool to the OBD-II port under the dashboard and turn on the ignition.
• Check for any other codes stored in the PCM and the PSCM. If there are other codes related to the power steering system, such as C0035 (left front wheel speed circuit malfunction) or C0040 (right front wheel speed circuit malfunction), you should diagnose and fix them first before proceeding with the C0000 code.
• Check the live data from the PCM and the PSCM and compare the vehicle speed readings. If they are not consistent or if one of them is missing, there is a communication problem between the modules.
• Check the wiring diagram of the vehicle speed information circuit and locate the wires and connectors involved. Inspect them for any signs of damage, corrosion, looseness, or short circuits. Repair or replace any faulty components as needed.
• Check the fuses and relays that supply power to the PCM and the PSCM and make sure they are not blown or faulty. Replace them if necessary.
• Clear the codes and test drive the vehicle to see if the C0000 code returns. If it does, you may have a defective PCM or PSCM that needs to be replaced.

How to Fix the C0000 Code?

To fix the C0000 code, you will need to replace either the PCM or the PSCM, depending on which one is causing the problem. However, before you do that, you should make sure that you have ruled out all other possible causes, such as wiring issues, electrical problems, or other codes. Replacing a module can be expensive and requires programming, so you should only do it as a last resort.

To replace a module, follow these steps:

1. Disconnect the negative battery cable and wait for 10 minutes to deactivate the airbag system.
2. Locate the module that you want to replace and disconnect its electrical connectors.
3. Remove any bolts or screws that secure the module to its mounting bracket and remove it from the vehicle.
4. Install the new module in reverse order and reconnect its electrical connectors.
5. Reconnect the negative battery cable and turn on the ignition.
6. Use a scan tool to program the new module with the vehicle identification number (VIN) and other parameters as required by your vehicle manufacturer.
7. Clear any codes and test drive the vehicle to verify that everything works properly.

Conclusion

The C0000 code is a common problem for vehicles with electronic power steering systems. It indicates that there is a malfunction in the vehicle speed information circuit, which affects the steering assist function. To fix this code, you need to diagnose and repair any wiring, electrical, or communication issues in the circuit, or replace either the PCM or the PSCM if they are faulty.

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