Diagnostic article Generic OBD-II
P0BD3: a low inverter-temperature signal can appear as extreme heat
GM P0BD3 concerns inverter A temperature sensor 2 low voltage, represented by a high calculated temperature in the source.
Read before applying this article
Documented application
GM 2010 10OBDG10 Hybrid Diagnostics, cited BPCM or hybrid-controller monitor only. Historical calibration values are not universal specifications; no per-code model, engine or hardware fitment has been established.
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.
P0BD3 is the low-voltage circuit diagnosis for inverter A temperature sensor 2 in the GM table. Its generic label is inverter temperature sensor C circuit low. The word low refers to electrical signal voltage, not to a cold inverter.
Understand the inverse temperature indication
GM associates the low-voltage condition with PIM Temp 1 above 125°C, near zero signal volts. This relationship explains why an implausibly hot scan value can require a sensing-circuit investigation rather than immediately proving a real thermal event.
The controller must be awake. The timing field specifies 250 qualifying counts within 350 counts, at a 10.4 ms rate, and lists two-trip reporting. Those are detection details for this calibration; they are not instructions to heat an inverter until a code appears.
Separate electrical and thermal evidence
The same document has distinct in-range overtemperature monitors. A direct circuit-low fault should therefore be evaluated with the other sensor readings and related faults before a technician treats the displayed temperature as established physical heat.
The source does not identify a connector pin, resistance test or mandatory sensor replacement. Match PIM Temp 1 to the actual vehicle's service information and verify the measurement path using the prescribed procedure. Any physical work around the high-voltage inverter requires the correct isolation precautions. Clearing the fault without demonstrating a credible signal under eligible operation is not meaningful verification.
Source and applicability
GM 2010 10OBDG10 Hybrid Diagnostics, cited BPCM or hybrid-controller monitor only. Historical calibration values are not universal specifications; no per-code model, engine or hardware fitment has been established. GM PDF, physical page 290.
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
Drive Motor Inverter Temperature Sensor C Circuit 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