P0552
Power Steering Pressure Sensor Circuit Range/Performance
Powertrain Chassis/Safety Power Steering 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Your car's power steering pressure sensor is sending a signal that's outside its normal operating range, like a gauge needle stuck in the wrong zone. The ECU can't trust the reading, so it triggers this code to alert you.

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Symptoms You May Notice
3 known symptoms for this code
Stiff or hard steering wheel, especially at low speeds
Power steering warning light illuminated on dashboard
Intermittent loss of power steering assist
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors voltage output from the power steering pressure sensor, which should vary proportionally with hydraulic pressure. When pressure changes, the sensor output should smoothly track within expected voltage limits. If the signal stays too high, too low, or doesn't respond to pressure changes, the ECM logs this fault.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Voltage Output 0.5–4.5 volts (varies with pressure) Below 0.2V or above 4.9V continuously
Pressure Response Rate Voltage changes smoothly with steering demand No change or erratic spikes during steering input
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Sensor connector and wiring harness
Inspect for corrosion, loose pins, or damaged insulation at the power steering pressure sensor connector and repair or reseat as needed.
2
Power steering fluid level and condition
Top off fluid to the correct level and verify it's not contaminated; low or dirty fluid can cause erratic sensor readings.
3
Power steering pressure sensor
Replace the sensor if connectors are clean and fluid level is correct but code persists.