The P0637: Power Steering Control Circuit High code indicates that the power steering control circuit is experiencing high voltage. This can be caused by excessive voltage in the circuit, a faulty power steering control module, or wiring issues. If not addressed, it can lead to improper or reduced power steering assist.
P0637 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0637: Power Steering Control Circuit High |
| Is it serious? | Yes, as it can cause issues with steering assist and vehicle handling. |
| Possible causes | – High voltage in power steering control circuit – Faulty power steering control module – Wiring issue |
| How to diagnose? | – Test the power steering control circuit voltage – Inspect wiring and connectors – Replace power steering control module if necessary |
P0637 Meaning
The P0637 code indicates that the power steering control circuit is receiving higher-than-expected voltage. This high voltage may interfere with the proper function of the power steering system, reducing or disabling steering assist and making the vehicle harder to steer.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other codes that may indicate additional problems with the power steering system. | OBD-II Scanner |
| Test the Power Steering Control Circuit Voltage | Use a multimeter to measure the voltage in the power steering control circuit and verify that it is within the manufacturer’s specifications. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors related to the power steering control module for signs of damage, loose connections, or corrosion that could lead to high voltage. | Flashlight, Multimeter |
| Test the Power Steering Control Module | If the circuit is experiencing high voltage, test the power steering control module for proper operation. | Diagnostic Tool, Multimeter |
| Replace the Power Steering Control Module if Necessary | If the control module is faulty or unable to regulate the voltage, replace it to restore normal steering assist. | Replacement Module, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure the power steering system is functioning correctly. | OBD-II Scanner, Vehicle Manual |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko