The OBD2 code P0637 refers to an issue in the power steering control circuit, indicating that the circuit is functioning at a higher level than expected. This code is triggered when the Powertrain Control Module (PCM) detects a fault related to the power steering system.
What Does the P0637 Code Mean?
When the PCM identifies a problem with the power steering control circuit, it records the P0637 code. This typically indicates that the alternator is not supplying adequate voltage to the vehicle’s electrical systems, which can lead to the disabling of non-essential electronics.
What Causes the P0637 Code?
Several factors can trigger the P0637 code, including:
- Alternator failure
- Powertrain Control Module (PCM) failure
- Wiring issues in the power steering control circuit
What Are the Symptoms of the P0637 Code?
Common symptoms associated with the P0637 code include:
- Battery/charging system warning light illuminated
- Non-essential electronic devices being turned off (e.g., radio, climate control)
How Serious Is the P0637 Code?
The P0637 code is considered to have moderate severity. While it may not pose an immediate threat to your vehicle’s safety or functionality, it should be diagnosed and repaired within a reasonable timeframe to prevent further issues.
How to Diagnose the P0637 Code
Diagnosing the P0637 code typically involves the following steps:
- Use an OBD-II scanner to confirm the presence of the P0637 code and any related codes.
- Inspect the alternator and battery for proper operation.
- Check wiring and connectors in the power steering control circuit for damage or corrosion.
- Test the PCM for proper functionality.
Common Repairs for the P0637 Code
Repairs for the P0637 code may include:
- Replacing a faulty alternator
- Repairing or replacing damaged wiring in the power steering circuit
- Replacing a malfunctioning PCM
How Much Does It Cost to Fix the P0637 Code?
The cost to repair the P0637 code can vary widely based on the specific issue and the labor rates in your area. Generally, you might expect to pay between $100 and $1000, depending on whether you need to replace the alternator, wiring, or PCM.
Can I Fix the P0637 Code Myself?
While some aspects of diagnosing and repairing the P0637 code can be done by a knowledgeable DIYer, it is often recommended to seek professional help, especially when it comes to testing and replacing electrical components. Proper tools and equipment are essential for an accurate diagnosis.
