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

Vehicle Speed Sensor B Circuit

Diagnostic & Technical Explanation

P2158 (Vehicle Speed Sensor B Circuit) is a secondary vehicle speed sensor, separate from the primary wheel-speed-derived signal, used by some transmissions or transfer cases as a redundant input. The ECM/TCM distinguishes a missing signal, a signal reading low, or one that is intermittent/erratic, and the leading causes are a worn tone-ring/reluctor at the sensor's mounting point, a corroded connector, and a chafed signal wire near the transmission or transfer case.

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
P2158	Vehicle Speed Sensor B Circuit	3 ranked fixes
P2159	Vehicle Speed Sensor B Circuit Range/Performance	3 ranked fixes
P2160	Vehicle Speed Sensor B Circuit Low	3 ranked fixes
P2161	Vehicle Speed Sensor B Circuit Intermittent/Erratic/High	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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