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

Vacuum Reservoir Pressure Sensor

Diagnostic & Technical Explanation

Code P2525 (Vacuum Reservoir Pressure Sensor Circuit) sets when the ECM sees an open, shorted, or implausible signal from the pressure sensor monitoring the vacuum reservoir that supplies actuators such as the brake booster or emissions valves. Causes are a corroded sensor connector, a cracked sensor housing losing its vacuum seal, or wiring chafed near the reservoir's engine-bay mounting location.

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
P2525	Vacuum Reservoir Pressure Sensor Circuit	3 ranked fixes
P2526	Vacuum Reservoir Pressure Sensor Circuit Range/Performance	3 ranked fixes
P2527	Vacuum Reservoir Pressure Sensor Circuit Low	3 ranked fixes
P2528	Vacuum Reservoir Pressure Sensor Circuit High	3 ranked fixes
P2529	Vacuum Reservoir Pressure Sensor 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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