P0D4E: very low high-voltage charger output is a reported sensor condition

P0D4E is the low-range check for the charger's hybrid/EV battery output-voltage sensor. The monitored quantity is the charger's reported high-voltage DC output, not the auxiliary battery voltage or an estimate of battery capacity.

Two controller states qualify the reading

The cited table requires the low-voltage secondary microcontroller and the high-voltage microcontroller to be awake. A failure is a sensor reading at or below 2.62 V for 400 milliseconds within a 500-millisecond window. The pass branch calls for a reading above 2.62 V for 500 milliseconds.

That near-zero boundary identifies the documented sensor-range condition. It is not a target pack voltage, a state-of-charge threshold or a safe-to-touch indication. The source classifies the diagnostic as one-trip Type A.

Do not turn a code into an isolation test

Keep the voltage report with the two controller states and relevant reference-voltage faults. A recorded low value does not prove that the physical high-voltage circuit is de-energized; an inaccurate measurement is among the possibilities that still require the correct diagnostic procedure.

Nor does this row determine whether the battery, charger or a connection has failed. It contains monitor criteria rather than a component-level repair sequence. Investigation must use the vehicle-specific procedure and trained high-voltage personnel. Clearing the fault and seeing a larger scan value later does not by itself verify the measurement path or establish that the original operating conditions have been reproduced.

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 719