Faulty power steering pressure sensor or switch reading high or stuck; Damaged, chafed or corroded wiring or connector at the sensor, causing a short to voltage on the signal circuit; Genuine high power steering pressure from a restriction, blocked hose or steering rack fault; Low, contaminated or incorrect power steering fluid causing abnormal pressure or pump behaviour; Faulty reference voltage supply or ground fault on the sensor circuit; Fault inside the engine control unit.

P0553

Power Steering Pressure Sensor/Switch Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
53: FaultThe specific fault in that area

What it means

P0553 means the engine control unit has seen the signal from the power steering pressure sensor or switch sitting higher than expected for too long. The sensor tells the ECU when the hydraulic steering system is under load, so it can raise idle speed or adjust fuelling to stop the engine stalling at full lock. A high reading can come from a real pressure problem or from a wiring or sensor fault.

Symptoms

Engine warning light on
Idle speed unstable, too high or too low when steering
Engine stalls or nearly stalls at parking speeds or full lock
Heavy or inconsistent steering feel
Whining or groaning noise from the power steering pump
Idle speed dips or hunts when the steering is turned

Possible causes

Faulty power steering pressure sensor or switch reading high or stucklikely
Damaged, chafed or corroded wiring or connector at the sensor, causing a short to voltage on the signal circuitlikely
Genuine high power steering pressure from a restriction, blocked hose or steering rack faultpossible
Low, contaminated or incorrect power steering fluid causing abnormal pressure or pump behaviourpossible
Faulty reference voltage supply or ground fault on the sensor circuitpossible
Fault inside the engine control unitrare

How to diagnose

Read the stored codes and freeze frame data to see engine speed, load and whether the steering was being turned when the code set
Check the power steering fluid level and condition, and look for leaks, aerated or dirty fluid
Inspect the sensor, its connector and the wiring for damage, corrosion, water ingress or chafing
Watch the live data for the sensor signal or switch state with the engine idling and the steering straight, then compare with the signal at full lock
Check the sensor supply voltage, ground and signal wire with a multimeter against the manufacturer's wiring diagram
Check for a short to voltage on the signal wire with the sensor unplugged, and see whether the reading changes
Inspect the hoses and pipes for kinks or restrictions and check the system pressure if the manufacturer specifies a test procedure
Clear the code and road test to see if it returns, which helps separate a fault that is still present from a one-off

How to fix

Replace the power steering pressure sensor or switch if it is faulty or stuck
Repair or replace damaged wiring and connectors, and fix any short to voltage, poor ground or supply fault
Correct the fluid level and flush and refill with the specified fluid if it is contaminated
Replace restricted or damaged hoses or pipes, or repair the pump or steering rack if a genuine pressure fault is confirmed
Have the ECU checked and repaired or replaced only after all wiring and sensor faults are ruled out

Can I keep driving?

Medium severity

The car can usually be driven short distances, but expect unstable idle, possible stalling at low speed and altered steering feel. Get it checked soon, and stop if the steering becomes very heavy or the pump is noisy.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.