Diagnostic article Generic OBD-II
P05BD: Ram stop-start switch faults versus the ignition module
FCA explicitly states that P05BD in this case is related to the electronic-shift-module stop/start on-off button, not the keyless ignition node.
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Documented application
FCA GPOP 9100676, dated October 29, 2025, concerns the specified 2025 Ram DT ignition-switch applications.
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 named switch can be misunderstood
FCA explicitly states that P05BD in this case is related to the electronic-shift-module stop/start on-off button, not the keyless ignition node. That distinction prevents replacing the ignition-switch module simply because a scan description contains the words “stop-start switch.”
A separate stored code has its own criteria
The note also discusses a stored B1A7D-2A start-button-stuck record in the radio-frequency hub. Its no-replacement guidance includes the absence of reported or observed functional problems. This is separate from identifying which module P05BD belongs to. Do not combine the two entries into an unsupported conclusion that every starting-system fault is harmless.
What the note supports next
Preserve the reporting module, full code and actual button behavior. Follow the referenced current service case for the relevant switch and electronic-shift-module circuit rather than substituting an ignition module. The short publication does not reproduce a complete electrical test tree, switch resistance or replacement threshold. If an actual functional fault is present, that needs diagnosis under the appropriate procedure. After repair, verify the original stop/start control behavior and returning faults. The useful result is correct system identification before buying parts, not a universal instruction to erase P05BD or disable stop/start.
Source and applicability
FCA GPOP 9100676, dated October 29, 2025, concerns the specified 2025 Ram DT ignition-switch applications.
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
Stop-Start Mode Switch Circuit Range/Performance
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