OBD-II Code P0552 — What It Means & How to Fix It

What Does This Error Mean?

P0552 means the power steering pressure sensor circuit voltage is lower than the minimum valid range. A low-voltage signal typically means the sensor or its wiring is shorted to ground. The PCM sees a signal that indicates extremely low or zero power steering pressure — even when the pump is working. This can cause the PCM to not raise idle speed when needed, potentially leading to engine stumble on tight, slow turns.

Affected Models

Vehicles 1996 and newer with hydraulic power steering and a pressure sensor
Common on GM vehicles (Chevrolet, GMC, Buick, Saturn) with V6 and V8 engines
Ford, Chrysler, Toyota, Honda, and Nissan models
Front-wheel-drive vehicles with belt-driven power steering pumps
Any vehicle where the PCM uses power steering pressure data for idle speed compensation

Common Causes

Power steering pressure sensor has an internal short causing low voltage output
Sensor wiring is shorted to chassis ground between the sensor and the PCM
Sensor connector has a corroded or shorted terminal creating a low-resistance fault
Power steering fluid has contaminated the sensor connector, causing electrical faults
PCM 5V reference supply to the sensor has a partial short reducing reference voltage below normal

How to Fix It

Unplug the power steering pressure sensor connector. Measure resistance between the signal wire terminal and chassis ground. If resistance is low (close to zero), the signal wire is shorted to ground or the sensor itself is shorted.

With the connector unplugged, resistance from the PCM-side signal wire to ground should be very high — hundreds of thousands of ohms.
Measure resistance across the sensor terminals directly. If the sensor reads low resistance between the signal terminal and ground terminal, the sensor has an internal short and needs replacement.

Power steering pressure sensors are 5V reference sensors. A shorted sensor pulls the reference line low and can affect other sensors on the same reference circuit.
Inspect the sensor connector for power steering fluid contamination. Fluid that wicks into the connector can create a conductive path between terminals, causing false low-voltage readings.

Clean the connector thoroughly with electrical contact cleaner. If the connector housing is cracked or fluid has been there for a long time, replace the connector pigtail.
Trace the wiring from the sensor to the PCM looking for any shorted wires. Pay attention to areas where the harness may have been pinched between the engine and frame during previous engine mounts or steering rack service.

Power steering system wiring often runs alongside hydraulic lines — check for chafing anywhere the wiring is in close proximity to metal lines or brackets.
Replace the sensor if it has an internal short. Install correctly — do not overtighten. Purge air from the system by turning the steering wheel lock-to-lock several times with the engine idling. Clear codes and verify the power steering pressure reading in scan tool live data.

After repair, the PCM should begin raising idle speed correctly when you turn the wheel at low speed — you can verify this by watching idle RPM on the scan tool while turning.

When to Call a Professional

Sensor replacement and wiring repair are DIY-friendly tasks. If the PCM reference circuit is compromised, a shop with electrical diagnostics can find the issue efficiently. Total repair cost is typically $50 to $200 for parts and labor.

Frequently Asked Questions

Can a shorted power steering pressure sensor affect other sensors?

Yes — potentially. Many sensors share a common 5V reference circuit from the PCM. A sensor with an internal short can pull the reference voltage down for all sensors on that shared circuit. If you are seeing multiple sensor codes alongside P0552, check whether they all use the same reference circuit.

Will the engine stall when turning with P0552?

Possibly. If the PCM cannot see the pressure rise when turning, it will not compensate with increased idle RPM. On a car that already has a somewhat low or rough idle, this can tip it into a stall when making a slow, sharp turn. Vehicles with otherwise healthy idle control usually have no noticeable stalling.

Is P0552 an emissions-related code?

Not directly — power steering pressure monitoring is not part of the emissions control system. However, a stored P0552 will still illuminate the check engine light, which will cause an automatic emissions test failure in most states. Fix it before your next emissions inspection.