P0552 — Power Steering Pressure Sensor Circuit Low Input

OBD2 code P0552 flags a problem with the sensor and actuator circuits (power steering pressure sensor circuit low input). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.

powertrain (engine/transmission)

Is it safe to drive?

Caution: monitor power steering operation If steering assist remains normal and there is no leak, noise, or warning beyond P0552, a short trip to a repair shop is generally reasonable. Do not continue driving if steering becomes heavy, assistance is lost, fluid is leaking, or the pump is groaning.

Typical symptoms

The check engine light or malfunction indicator lamp may illuminate with P0552 stored in the controller
An OBD scanner may report a power steering pressure signal below the expected range, if live data is supported
Power steering assist may be reduced, inconsistent, or unavailable while P0552 is active
Some vehicles show no obvious symptom beyond the warning lamp and stored diagnostic trouble code
Groaning, whistling, stiffness, or fluid leakage may be present if a separate hydraulic fault is also affecting the system

Common causes

A short to ground in the power steering pressure sensor signal wire
An open circuit, high resistance, or damaged wiring between the sensor and powertrain control module
A corroded, loose, or water-contaminated power steering pressure sensor connector
A failed power steering pressure sensor with an internally shorted or faulty signal element
An incorrect sensor reference voltage or poor sensor ground, including wiring damage at the powertrain control module

How to diagnose with an OBD scanner

Confirm P0552 with an OBD scanner Connect an OBD scanner, ELM327 adapter, or AIScanAuto and read stored, pending, and active codes. Confirm that P0552 is present and record any freeze-frame data before clearing the code.
Review the pressure sensor signal If the scanner supports a power steering pressure parameter, compare it with engine-off and engine-running conditions. A near-zero or implausibly fixed value suggests a low-input circuit fault, although parameter availability varies by vehicle.
Inspect the sensor wiring and connector Locate the power steering pressure sensor connector and inspect it for corrosion, bent terminals, pushed-back pins, oil contamination, or water intrusion. Follow the harness and check for chafing or damage near moving steering components.
Test the circuit with the specified wiring diagram Using the vehicle wiring diagram, verify the sensor reference voltage, sensor ground, signal-wire continuity, and absence of a short to ground. Backprobe the connector while checking for voltage drop across suspect sections; the specified reference is commonly 5 volts but should not be assumed.
Isolate the sensor and hydraulic condition If the wiring, reference voltage, and grounds are normal, test or replace the power steering pressure sensor. Check fluid level, aeration, leaks, and restricted flow only after the electrical fault is addressed because P0552 itself is an electrical input code.
Clear and verify the repair Clear P0552 with the scanner, restart the vehicle, and road test while monitoring the code and power steering operation. P0552 should not return if the corrected circuit or sensor is operating within the specified range.

Approximate repair cost

Typical independent-shop cost for diagnosing and repairing P0552 is approximately USD 150–650, depending on whether the required work is wiring or connector repair, sensor replacement, or additional hydraulic service. These figures are estimates and vary by region and vehicle-specific labor rates.

Common questions

Does P0552 mean the power steering has no hydraulic pressure?

No. P0552 identifies an abnormally low electrical input from the power steering pressure sensor circuit; it is not a direct measurement of hydraulic pressure, although another fault may be reducing pressure.

Is it safe to drive a vehicle with P0552 stored?

Driving may be possible if steering assist remains normal and there are no leaks or unusual noises, but reduced or lost assistance requires prompt repair and cautious handling of the steering.

What commonly causes P0552?

The usual causes include a shorted signal wire, damaged or corroded wiring, a faulty connector, an incorrect reference voltage, poor ground, or a failed power steering pressure sensor.

Do I need to replace the pressure sensor for P0552?

Not automatically. The circuit, connector, reference voltage, and ground should be tested first; the sensor should be replaced only when testing confirms that it is producing an invalid low signal.

The engine control module (ECM) logs trouble code P0552 when it detects that the power steering pressure sensor circuit is feeding back a voltage signal that falls below the acceptable minimum threshold. In plain terms, P0552 tells you the sensor is either not receiving proper voltage or the signal line is being pulled unexpectedly close to ground. This code falls within the powertrain category of OBD2 codes, meaning it relates directly to engine and drivetrain management rather than chassis or body systems.

The power steering pressure sensor monitors hydraulic pressure in the steering system and reports that data back to the ECM. The module uses this information to adjust idle speed, transmission shift points, and in some cases power steering assist. When P0552 triggers, the ECM has confirmed that the signal voltage on that circuit has remained abnormally low through multiple test cycles—not just a single momentary glitch. This distinction matters because it means the problem is persistent enough for the module to consider it a genuine fault rather than electrical noise.

When the module logs P0552, it also captures a freeze frame snapshot: engine load, RPM, coolant temperature, vehicle speed, and other sensor readings at the exact moment the fault occurred. That snapshot is your roadmap for recreating the failure condition during diagnosis. Without those specific conditions—often a particular RPM range under load—the sensor may behave normally on a bench test or during casual driving, making the fault difficult to reproduce.

Common Symptoms of P0552

The Check Engine Light illuminates and remains on until the fault is cleared.
The affected system (power steering assist or related functions) may operate intermittently or fail entirely.
Limp-home mode activation is possible, depending on which component the module prioritizes when it detects the fault.
Fuel consumption may increase because the ECM adjusts engine operation based on incorrect steering system data.
In rare cases, the vehicle may experience hesitation or stumble under load when the module relies on faulty sensor input.

What Causes P0552?

A failed power steering pressure sensor internally shorting the signal circuit to ground.
Chafed or cut wiring insulation allowing the signal wire to contact bare metal and short to ground.
A blown fuse interrupting the supply voltage feed to the power steering pressure sensor.
Corrosion, looseness, or physical damage at the sensor connector or any inline harness junction.
Missing or insufficient reference voltage reaching the sensor due to circuit interruption.
An open circuit somewhere in the wiring preventing the signal from reaching the ECM.
A poor ground connection at the sensor causing unreliable circuit reference.
In less common cases, an internal driver fault within the ECM itself outputting incorrect voltage on that circuit.

How to Diagnose P0552

Connect a scan tool and confirm P0552 is stored in the ECM memory. Record the freeze frame data immediately—this information shows the engine conditions present when the module first detected the fault and is essential for recreating the problem during testing.
Check for any other stored trouble codes. Related codes in the same circuit often point directly to the root cause, such as a short or open affecting multiple sensors. Also search for any manufacturer technical service bulletins (TSBs) specific to P0552 for your vehicle—some makes have documented software updates or known issues with this code.
Perform a thorough visual inspection of the wiring harness and connectors associated with the power steering pressure sensor. Look for damaged insulation, rubbed-through wires, corrosion buildup, pushed pins, or loose connections that could interrupt voltage or create a short.
At the sensor connector, use a multimeter to check for proper supply voltage first. Then measure resistance from the signal wire to ground—if you read near-zero ohms, the harness has a direct short to ground that must be repaired before the sensor will function.
Verify reference voltage, ground integrity, and signal continuity at the component side of the connector. This step isolates whether the fault lies in the harness or within the sensor itself.
Perform a wiggle test on the harness while monitoring live data on the scan tool. Any signal dropouts or irregularities during physical manipulation of the wiring point to broken strands inside the insulation or intermittent connector issues.
Clear the code after repairs and complete a full drive cycle that reproduces the conditions recorded in the freeze frame. If P0552 does not return, the repair is confirmed.

Repair Options and Costs

The appropriate repair depends entirely on which component the diagnostic process identifies as faulty. Labor rates assume an independent repair shop in the United States.

Repair wiring or replace connectors: $80–$250
Replace the power steering pressure sensor (or related actuator): $150–$500
Control module repair or replacement (rarely the cause): $300–$1,000

Most P0552 faults resolve at the lower end of the cost spectrum when wiring damage or a failed sensor is confirmed. Control module issues account for a small percentage of cases and should be ruled out only after thoroughly inspecting the harness and connectors.

Can You Drive with P0552?

In most instances, the vehicle remains drivable. The ECM may reduce performance or disable certain auxiliary functions, but the car will still move under its own power. However, if the underlying condition causes stalling, unresponsive steering assist, or triggers brake system warnings, the situation becomes urgent and the vehicle should not be driven until diagnosed. Treat P0552 as a maintenance issue to be addressed promptly rather than a breakdown risk, but do not ignore persistent drivability symptoms.