P0637: Power Steering Control Circuit High
HighPowertrainEngine Electronics
What does P0637 mean?
P0637 is a diagnostic trouble code indicating "Power Steering Control Circuit High". The ECU is reading a voltage that is above the expected range. This can be caused by a short to power in the wiring, a failed sensor, or a connector issue in the engine electronics.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $500 AUD
Common causes
- Damaged or corroded wiring harness
- Loose or disconnected electrical connector
- Failed engine electronics sensor or actuator
- Blown fuse in the related circuit
- Poor ground connection
What should you do?
This code sits in the steering system. Power assistance can cut out without warning, which makes the wheel go heavy, usually worst at parking and low speeds. Steering itself does not disappear, but the effort changes suddenly. Get it diagnosed before driving.
Get a diagnosis for YOUR car
Code P0637 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.