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

Vehicle Speed Correlation

Diagnostic & Technical Explanation

P215A (Vehicle Speed - Wheel Speed Correlation) is a plausibility check comparing vehicle speed as calculated from two independent sources — wheel speed sensors, transmission output shaft speed, or a secondary vehicle speed sensor — and flags when they disagree beyond the expected tolerance for tire slip. A mismatched tire size or worn tire on one axle, a failing wheel speed or output shaft speed sensor feeding one of the two signals, and a transfer case or differential slipping internally are the common causes.

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
P215A	Vehicle Speed - Wheel Speed Correlation	3 ranked fixes
P215B	Vehicle Speed - Output Shaft Speed Correlation	3 ranked fixes
P215C	Output Shaft Speed - Wheel Speed Correlation	3 ranked fixes
P2162	Vehicle Speed Sensor A/B Correlation	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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