Diagnostic article Generic OBD-II
P0D43: low-voltage charger output disagrees with vehicle references
The GM P0D43 plausibility test changes its voltage comparisons with Run/Crank state and excludes specified reference and sensor circuit faults.
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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.
P0D43 is a rationality check of the charger's nominal 14 V output-voltage measurement. The table compares the charger report with other vehicle voltage information. That is more specific than simply deciding whether the auxiliary battery is charged.
Run/Crank selects the comparison
With Run/Crank high, the documented failure requires the charger output-voltage report to differ from both the Run/Crank voltage and the HVEMB-enable voltage by at least 6 V. With Run/Crank low, the specified comparison uses the HVEMB-enable voltage alone.
The failure must be present for four seconds in a five-second window. The low-voltage secondary controller must be awake. GM also excludes its specified reference-voltage faults and the P0D44/P0D45 voltage-sensor range faults, so those companion records affect whether this comparison is meaningful.
Investigate disagreement before replacing hardware
Keep the control-state information with the compared voltages. A technician who records only the charger reading loses the information needed to identify which branch was active. Likewise, a stored circuit-range fault should not be ignored while interpreting a rationality result that depends on a valid sensor signal.
The document does not identify which reference is inaccurate when the values disagree. It gives neither an auxiliary-battery replacement rule nor a universal output setting. Use the matching vehicle wiring and charger diagnostics to establish that. These are internal control comparisons in a historical calibration, not instructions for live probing of the charger or its high-voltage supply.
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
Battery Charger 14 Volt Output Voltage Sensor 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