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OBD Code P0637

Power Steering Control Circuit High

CodeP0637
DescriptionPower Steering Control Circuit High
Possible CausesShort to voltage|Faulty EPS module
SymptomsPower steering erratic|Warning light
SystemChassis

What Does P0637 Mean?

Power Steering Control Circuit High. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the chassis.

Code Breakdown

P = Powertrain code

0 = Generic (SAE standard)

How to Fix P0637

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check power steering fluid level and condition (hydraulic systems).
  2. Inspect the power steering pump for noise or leaks.
  3. Check the pressure hose and return hose for leaks.
  4. For electric power steering, check the EPS motor connector and wiring.
  5. Test the torque sensor if the code relates to assist level.
  6. Clear codes and verify steering assist at low and high speeds.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P0637 serious?

Yes — P0637 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear P0637 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P0637?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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