Diagnostic article Generic OBD-II
P0D7A: compressor phase-U current needs a polarity-aware interpretation
The GM P0D7A row names phase-U current low, but its printed signed-current comparison requires clarification before being used as a service limit.
Read before applying this article
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.
P0D7A identifies the phase-U current diagnostic of the electric A/C compressor in this GM table. The specific phase matters: it is not the DC-link current measurement and is not interchangeable with the V- or W-phase records.
The label does not establish signal polarity
The source labels the fault current low but prints a positive upper-side comparison for its phase-U input. Without the internal sensing and sign convention, that relationship cannot be translated into a universal physical-current rule. This article therefore leaves the exact numerical service interpretation unresolved instead of silently reversing the source's label or inequality.
The operating-state criteria are usable: the compressor speed request must be zero, low-voltage supply must be sufficient, and Accessory or Run/Crank must be active. The monitor counts 30 failures out of 60 samples at a 50-millisecond interval.
A stopped-command test is a distinct diagnostic event
Record the phase identifier, current report and zero-speed request together. A current value observed during a running request is not the same evidence as the stopped-command evaluation described here. The continuation also records a reset prerequisite before passing is enabled after failure.
Neither the phase label nor that reset prerequisite proves a winding defect or prescribes a repair. The applicable professional procedure must establish signal mapping and component condition. Do not probe or disconnect high-voltage compressor phases using this monitor summary as a test guide.
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.
General Motors source, physical page 712 · General Motors source, physical page 713
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 Phase U Current Low
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