Fault Family System: Powertrain (P-Codes) 6 SAE Codes

Shift Motor Position Sensor

Diagnostic & Technical Explanation

Code P28E7 (Shift Motor Position Sensor Circuit/Open) sets when the TCM sees an open, shorted, or implausible signal from the shift motor's position sensor, a position that has never been learned, or a learned value that has drifted past its limit, leaving the TCM unsure which gear position the mechanism physically occupies. Causes are a worn position sensor, a lost calibration after battery disconnection or repair, and mechanical wear letting the true position drift from the learned map.

These 6 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 6 times.

Codes in this family (6)

Code	Definition	Repair coverage
P28E7	Shift Motor Position Sensor Circuit/Open	3 ranked fixes
P28E8	Shift Motor Position Sensor Circuit High	3 ranked fixes
P28E9	Shift Motor Position Sensor Circuit Low	3 ranked fixes
P28EA	Shift Motor Position Sensor Circuit Range/Performance	3 ranked fixes
P28EB	Shift Motor Position Not Learned	3 ranked fixes
P28EC	Shift Motor Position Sensor Exceeded Learning Limit	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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