P0A2B: Motor A temperature is checked against the inverter after a long soak

P0A2B compares motor A temperature with the average power-inverter-module temperature. This is an in-range rationality check: the sensor may report an electrically valid value while its relationship to the inverter temperatures is implausible.

The soak is essential context

The documented comparison requires ignition-off time of at least 360 minutes. Both the motor-temperature value and inverter average must be at least −40°C. A difference greater than 28°C is the listed failure quantity, after a startup delay and sampling interval.

The continuation on the next physical page excludes the named motor and inverter out-of-range temperature faults. Those exclusions mean that an invalid reference temperature should not be treated as trustworthy evidence against motor A's sensor.

Capture the startup temperatures together

A useful record includes the off-time history, motor A temperature and the inverter average at startup. Comparing a cold motor reading with an inverter value taken later under load does not reproduce the documented thermal relationship.

The table does not determine which temperature sensor is wrong or provide a sensor resistance curve. It also does not establish actual motor overheating; P0A2F handles a separate thermal condition. Applicability and any circuit tests must come from the matching motor-controller service information. Access to motor and inverter electronics requires professional high-voltage isolation and verification, not live probing based on the monitor thresholds.

Source and applicability

GM 2010 10OBDG10 Hybrid Diagnostics, only the cited controller and monitor. These are historical calibration examples; individual vehicle, engine and hardware applicability is not established. GM PDF, page 286. GM PDF, page 287.