P0A1C: A motor-B controller fault has a mislabeled source heading

The generic P0A1C definition concerns motor B control-module performance. In this GM PDF the row appears inside the MCP B controller-fault section, but its component cell says motor A. That naming conflict is retained here rather than silently presenting the row as a verified hardware-location map.

What the row does establish

The listed criteria concern internal processor status, stack-address overrun and incomplete EEPROM writing during powerdown. Evaluation requires the wakeup signal, and the watchdog-related branch excludes certain reset, overflow and low-12V interrupt conditions.

Separate rows on the same page identify motor B RAM, ROM, EEPROM and programming diagnostics. Their presence helps distinguish a general internal-performance report from a specifically named memory test, although it does not resolve the incorrect component label.

Keep module identity with the evidence

Record which controller actually reported P0A1C, its calibration and accompanying supply or internal-status codes. Do not identify a physical motor-A assembly from the single conflicting cell, or assume a generic scanner's expanded title establishes the module location.

The source is useful for understanding the types of internal checks involved but insufficient for a replacement or programming decision. The matching service information must resolve applicability and component identity. High-voltage motor-control equipment requires trained professional isolation and diagnosis; this table provides no safe invasive test procedure.

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 300.