Fault Family System: Powertrain (P-Codes) 4 SAE Codes

Fan Speed Sensor Circuit

Diagnostic & Technical Explanation

Code P0526 (Fan Speed Sensor Circuit) sets when the ECM does not see a plausible tachometer/speed feedback signal from the cooling fan motor, distinct from a fault in the fan's power driver circuit. Causes are a failed Hall-effect speed sensor inside the fan motor, a damaged connector at the fan shroud, or chafed wiring where the harness flexes near the fan.

These 4 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 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P0526	Fan Speed Sensor Circuit	3 ranked fixes
P0527	Fan Speed Sensor Circuit Range/Performance	3 ranked fixes
P0528	Fan Speed Sensor Circuit No Signal	3 ranked fixes
P0529	Fan Speed 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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