• The fault code P0637 indicates that there is a high voltage issue in the power steering control circuit. This can cause the power steering to not function properly or at all.

Possible Symptoms:

  • Difficulty steering or loss of power steering

  • Illuminated power steering warning light

  • Unusual noises coming from the power steering system

  • Stiff, jerky, or erratic steering

  • Reduced or inconsistent steering assistance

Possible Causes:

  • Faulty power steering control module

  • Corroded or damaged wiring in the power steering control circuit

  • Loose or disconnected electrical connections

  • Failed power steering pump

  • Failed battery or alternator

Related Parts:

  • Power Steering Circuit: Circuit that controls the power steering in the car. Problems lead to hard steering

Possible Solutions:

  • Replace the power steering control module

  • Inspect and repair any damaged wiring in the power steering control circuit

  • Tighten or reconnect any loose or disconnected electrical connections

  • Replace the power steering pump if necessary

  • Replace the battery or alternator if necessary