Power Steering Control Circuit Low Voltage
The P0636 code indicates that the Power Steering Control Module (PSCM) has detected a low voltage condition in the control circuit. This typically means the voltage signal from the steering angle sensor or the control module itself is below the expected range. The issue can be caused by a faulty steering angle sensor, damaged wiring, poor electrical connections, or a failing power steering control module. Low voltage can lead to erratic power steering assist or complete loss of power steering functionality.
01. Most Common Causes
- Faulty steering angle sensor
- Damaged or corroded wiring/connectors in the power steering control circuit
- Failing power steering control module
- Low battery voltage or charging system issues
02. Symptoms You Will Notice
- Power steering warning light illuminated
- Increased steering effort or intermittent power steering assist
- Steering wheel vibration or unusual noises
- Vehicle may enter fail-safe mode with reduced steering assist
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional related codes.
Step 2: Inspect the power steering control circuit wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the steering angle sensor voltage and resistance per manufacturer specifications.
Step 4: Check battery voltage and charging system output; repair if low.
Step 5: If all else is okay, suspect a faulty power steering control module and consider replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to sudden loss of power steering assist, making the vehicle difficult to control, especially at low speeds.
How much does it cost to fix?▼
The cost to fix P0636 typically ranges from $50 to $150 for diagnosis and minor repairs like wiring fixes, but could be higher if the power steering control module needs replacement.