The P0859 OBD-II code indicates that there is a problem with the traction control input signal in your vehicle. Specifically, it suggests that the signal is reading high, which can disable the traction control system.
What Does the P0859 Code Mean?
The P0859 code is logged when the Powertrain Control Module (PCM) detects a high input signal from the traction control system. This usually leads to the disabling of the traction control feature, which can affect vehicle stability and control.
What Causes the P0859 Code?
Several factors can trigger the P0859 code, including:
- Failure of the Electronic Brake Control Module (EBCM)
- Failure of the Powertrain Control Module (PCM)
- Wiring issues between the EBCM and PCM
What Are the Symptoms of the P0859 Code?
When the P0859 code is present, you may experience the following symptoms:
- Traction control system is disabled (this may be indicated by a warning light on the dashboard)
- Reduced engine power during braking
- Poor vehicle handling, especially in slippery conditions
How Serious Is the P0859 Code?
The P0859 code is considered urgent. It indicates a significant malfunction that can lead to serious vehicle damage or compromise the safety of the driver and passengers. Immediate action is recommended to address this issue.
How to Diagnose the P0859 Code
To accurately diagnose the P0859 code, follow these steps:
- Use an OBD-II scanner to confirm the presence of the P0859 code and check for any related codes.
- Inspect the wiring and connectors between the EBCM and PCM for damage or corrosion.
- Test the EBCM and PCM for proper operation.
- Check for any software updates or recalls related to the vehicle’s control modules.
Common Repairs for the P0859 Code
Repairs for the P0859 code may include:
- Replacing a faulty Electronic Brake Control Module (EBCM)
- Replacing a faulty Powertrain Control Module (PCM)
- Repairing or replacing damaged wiring or connectors
How Much Does It Cost to Fix the P0859 Code?
The cost to fix the P0859 code can vary widely based on the specific repairs needed. Expect to pay anywhere from $100 to $1,000 or more, depending on whether you need a simple wiring fix or a complete module replacement.
Can I Fix the P0859 Code Myself?
While some aspects of diagnosing and fixing the P0859 code can be done by a knowledgeable DIYer, it is often best to consult with a professional mechanic. Because this code involves critical safety systems, proper diagnosis and repair are essential to ensure the vehicle operates safely.
