Diagnostic article Generic OBD-II
P0D6A: high compressor voltage includes a recovery-state requirement
GM P0D6A uses separate high-voltage failure and recovery boundaries and requires the compressor speed request to return to zero before passing.
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Documented application
GM 2015 15OBDG01 Hybrid Diagnostics, only the cited EACCM monitor and calibration. Per-code vehicle and engine applicability has not been established; these historical thresholds are not universal service specifications.
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.
P0D6A is the high-range voltage check for the electric A/C compressor in this GM calibration. Its prerequisite comparison with battery-voltage information helps distinguish the documented evaluation from a free-standing sensor reading taken in an arbitrary operating state.
Failure and recovery are not identical
The failure boundary is at least 450 V, with 30 failures out of 60 samples at a 50-millisecond interval. System voltage must exceed 10.25 V and the hardware state must indicate Accessory or Run/Crank. The listed battery-voltage fault must be inactive, and the compressor reading must be within 15 V of the battery reference.
The pass boundary is 440 V or less. After a failure, the compressor speed request must also go to zero before passing is enabled. Thus, merely seeing voltage drop below the failure boundary does not establish that the stated recovery requirements were met.
Interpret a qualified high-voltage report
Capture the compressor reading, battery reference, hardware state and speed request together. Their relationship explains which diagnostic branch could run and whether a later normal-looking value represented an eligible pass.
The table does not prove a failed compressor, nor does it specify a universal battery charging limit. It supplies monitor criteria for a historical system. Physical diagnosis belongs to qualified high-voltage personnel using the matching service information. The thresholds are not instructions to apply voltage, bypass controls or access energized compressor wiring.
Source and applicability
GM 2015 15OBDG01 Hybrid Diagnostics, only the cited EACCM monitor and calibration. Per-code vehicle and engine applicability has not been established; these historical thresholds are not universal service specifications.
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
A/C Compressor Motor Voltage Sensor A Circuit High
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