Diagnostic article Generic OBD-II
P0A1E: Starter-generator controller internal execution checks
P0A1E reports a failure of specified internal starter-generator controller performance checks.
Read before applying this article
Documented application
2009 General Motors diagnostic parameter file 09OBDG08 Engine Diagnostics.pdf. Section-specific modules and calibrations; no per-code model or engine applicability established.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
The P0A1E entry in GM's BAS hybrid section concerns internal performance of the starter/generator control module. Its listed checks cover calculation, task execution, dual-path agreement, a secondary processor and clock supervision. The code is therefore broader than a single failed memory location.
Neighboring module codes describe different checks
The same page assigns separate codes to RAM, ROM checksum and internal driver faults. Those distinctions matter when interpreting a code bundle. P0A1E should not automatically be rewritten as a RAM fault or a failed power driver just because all are inside the same module.
The documented check operates with the module awake and can register a failure from one internal check result. Its trip classification is separate from the individual detection event. A single historical code does not reveal which listed internal test failed.
Obtain the detailed module evidence
Preserve the originating module's full diagnostic record, identification and companion faults. The summary does not provide a component-level repair procedure or establish that replacement is appropriate without the vehicle-specific diagnostic process.
Use the applicable hybrid service information to assess the internal fault and any relevant supporting conditions. Do not open or probe power electronics based on this code description. Verification should show that the relevant internal checks complete successfully after the prescribed correction. An engine controller showing no codes immediately after clearing does not independently confirm the starter/generator module's internal health.
Source and applicability
2009 General Motors diagnostic parameter file 09OBDG08 Engine Diagnostics.pdf. Section-specific modules and calibrations; no per-code model or engine applicability established. This explanation describes the documented monitor, not a universal repair procedure.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Starter/Generator Control Module
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT