One day the steering is light enough to turn with a finger. The next, parking feels like wrestling an old truck. It's an unsettling change, but it's usually the car protecting itself rather than something about to fall apart. Here's what's normally behind it.
First, how modern steering is assisted
Older cars used a belt-driven hydraulic pump to make steering easier. Most cars built in the last decade or so use electric power steering instead: an electric motor on the steering rack or column, a torque sensor that measures how hard you're turning, a steering angle sensor that tracks where the wheel is pointing, and a control unit that decides how much help to give. When any part of that chain reports a problem, the system often reduces or switches off the assistance.
The most common causes
- A torque sensor fault, which leaves the system unsure how much help you need
- A failing assist motor, or worn motor connections
- A control unit fault, sometimes triggered by heat or moisture
- Low system voltage from a tired battery or a charging problem
- Lost calibration after a sensor, rack or alignment job
- Worn mechanical parts inside the rack itself
On older hydraulic systems, the usual suspects are low or leaking fluid, a slipping belt, or a worn pump.
Check the battery first
Electric steering draws a lot of current at parking speeds. If the battery or alternator is struggling, the system may cut back assistance to protect itself, and the problem can come and go. It's one of the cheapest causes to rule out, so it's always worth testing before anything else.
When the warning light comes on
A steering warning light means the system has stored a fault code. Sometimes the steering still feels normal; sometimes assistance drops straight away. Either way the code tells a technician where to start looking, so have it read promptly rather than waiting to see whether it clears.
Is it safe to keep driving?
If the steering is still assisted and the light is on, drive gently and have it checked as soon as you can. If the steering suddenly becomes very heavy while you're moving, slow down, stop somewhere safe and call for advice. You can still steer without assistance, but it takes much more effort, especially at low speed.
Repair, not always replace
A heavy-steering fault doesn't automatically mean a new steering rack. In many cases only one sensor, the motor or the control unit has failed, and that part can be repaired or replaced on its own. The rack then has to be calibrated so the car can read the wheel position correctly again.
If your steering has gone heavy, or the steering light is on, read more about our electric steering rack repair in Pretoria, or call the workshop on 012 335 3360 and describe what you're feeling.
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