Error Code P0635 is defined as Power Steering Control Circuit, meaning there’s a problem in the power steering control circuit, often caused by defective steering position, broken wiring, or pressure switch.
What the P0635 code means:
If one of the relevant control modules registers a problem with the power steering control circuit, the P0635 trouble code will be logged in the vehicle’s onboard computer. This may result in a host of steering issues for the vehicle.
➢ Inconsistent or stiff steering
➢ Noise while turning
➢ Check Engine Light illumination
➢ Noise from P/S steering system
➢ Loss of hydraulic fluid from the reservoir
➢ Decrease in power-assist whereas turning the steering wheel
➢ Noticeable lack of power assist when turning the steering wheel
➢ Abnormally hard steering effort while driving
➢ Abnormality Steering Feeling while at the same time driving
➢ Service Engine Soon Warning Light
Common causes for this code include-
➢ Faulty Power Steering Control
➢ Power Steering Control circuit poor electrical connection
➢ Bad Power Steering Control Module
➢ Leak in Hydraulic System (Low or High Pressure)
➢ Open or Short in Sensors and Lines
➢ Defective power steering pressure switch
➢ Defective power steering position switch
➢ Defective steering wheel
➢ Loose control module ground strap
➢ A Leak or insufficient fluid level
A mechanic may initially diagnose a P0635 by reading the code with an OBD-II code reader.
Firstly, the position/ place and pressure switches in the steering system should be checked for probable signs of faultiness. Each control module relating to the steering circuit should be checked for voltage and visible signs of malfunction. Because there are a lot of control modules potentially associated with the steering circuit, you should concentration first on the modules your vehicle may have had problems with in the past.
To diagnose a P0635 DTC code, an automotive technician would:
- Check the power steering fluid level. If it is low, top off and carry on with the diagnosis.
- Inspect the condition of all related elements, including cables, lines/hoses, reservoir bag, power steering pump pulley, belt tensioner assembly, etc.
- Check for external leaks at the pressure control switch/pulsation dampener assemblage under the vehicle near or on the brake fluid reservoir
- Check for inside leaks by checking high-pressure hydraulic hoses for small splits in them
- Test for short to the voltage at both ends of lines from power steering pressure switch dampener assembly to PCM.
- Use a scan tool to view live data while turning the steering wheel, and check the pressure to power the steering control module.
- Check for low / high pressure in hydraulic system.
- Reset DTCs and road test vehicle to recheck issues.
To avoid any misdiagnosis be sure of the fact that if you receive multiple trouble codes after that focus on the ones first that are related to CAN and then move on to others. Besides, make use of a specialized scanner to highlight the control module issues accurately and efficiently.
➢ P0635 relates to a control module’s failure to communicate entirely, another trouble codes may be logged and repaired needlessly.
➢ Failed to observe closely for small leaks, which may be difficult to detect.
➢ Checked short circuits but missed open circuits while checking resistance in wires and all connectors
➢ Did not use a scan tool to recheck trouble codes later resetting them with a scan tool
If you have received many trouble codes, you should focus on the ones that pertain immediately to the Controller Area Network (CAN) prior to tending to component related issues themselves.
What are the common repairs for this code?
➢ Replacing the blown fuse or fusible link (if equipped)
➢ Repair power steering leak
➢ Replace power steering controller
➢ Flasher or replace PCM
➢ Supervises all related components for damage
➢ In the event of a power steering pump failure, replace it.
➢ Supervises PCM sensor harness connector and wiring for open circuits, short circuits, and loose connections
➢ Repair short to voltage in wires from power steering pressure switch/pulsation dampener assembly to PCM
➢ Remove kinked or blocked hoses or external leaks from under vehicle near brake fluid reservoir
➢ Replace PCM if any other problem is found beyond the scope of these checks.
➢ Replacement of the power steering pressure switch
➢ Replacement of the power steering position switch
➢ Repair or replacement of faulty wiring
How serious is the P0635 code?
Error Code P0635 will termination your vehicle’s drivability if left unchecked. Even if your vehicle may be drivable, limited steering can prove to be a safety hazard on the road. Remember, a P0635 code should be addressed As early as possible.
How much does it cost to fix the P0635 code?
The repair cost of a P0635 code depends on the range of the problem and who fixes it. The mean cost for a P0635 repair is between $100-$200. For a high-end account, an automotive service professional may charge almost $200-300 to diagnose and repair a power steering system with this code or other problems that are related.
If you are having stiff or difficult steering while driving, be sure to have your vehicle towed in for repair as soon as possible because it can become risky without power assist. If left unattended, severe damage could occur to internal components of the hydraulic system. Even if your car is still drivable, poor steering may put you and other drivers at hazard on the road.
As s result a P0635 fault should be addressed as soon as possible – the cost of repairing the code depends on where you go for service and how expansive the damage is. I hope the information in this article was helpful in pointing you in the right direction to fix the problem with your power steering circuit fault code. This article is strictly informational and technical data and service bulletins specific to your vehicle should always take priority.