Fault Family System: Powertrain (P-Codes) 5 SAE Codes

Power Steering Pressure Sensor Circuit

Diagnostic & Technical Explanation

Code P0550 (Power Steering Pressure Sensor/Switch Circuit) sets when the ECM sees an open, shorted, or implausible signal from the power steering pressure sensor/switch used to add idle load compensation during parking maneuvers. Causes are a failed sensor/switch, power steering fluid contamination fouling the sensor port, or chafed wiring near the steering rack/pump.

These 5 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
P0550	Power Steering Pressure Sensor/Switch Circuit	3 ranked fixes
P0551	Power Steering Pressure Sensor/Switch Circuit Range/Performance	3 ranked fixes
P0552	Power Steering Pressure Sensor/Switch Circuit Low	3 ranked fixes
P0553	Power Steering Pressure Sensor/Switch Circuit High	3 ranked fixes
P0554	Power Steering Pressure Sensor/Switch Circuit Intermittent	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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