P0C4E: Motor A learned offset exceeded the accepted angle

P0C4E is the motor-A position-learning limit diagnostic in the cited GM controller. The key condition is that offset learning completes, but the absolute correction angle is greater than 30 degrees. This is different from a procedure that never produces a valid learned result.

Completion and acceptability are separate

The neighboring not-learned diagnostic addresses an unsuccessful learn without a previously valid value. P0C4E instead evaluates the value obtained after completion. A workshop should retain both the completion status and the learned correction rather than describe every learning-related code as a need to repeat the same procedure.

The listed learning conditions include absolute motor speed below 20 rpm and high-voltage supply above 192 volts. The table records a 300-millisecond learn time. These are historical monitor parameters, not instructions to energize or position a motor manually.

Use the stored result as evidence

An excessive learned angle does not identify a failed resolver, wiring connection or mechanical part by itself. The actual vehicle procedure must determine why the completed result is outside its accepted range and whether other position-sensing faults affect interpretation.

The motor-A designation requires the correct propulsion-system mapping. The source supplies no universal physical location or replacement instruction. Resolver learning and high-voltage motor work belong with qualified personnel using the applicable diagnostic routine, with the original correction value and operating conditions preserved for verification.

Source and applicability

15OBDG01 Hybrid Diagnostics, cited controller and monitor only. Historical calibration limits are not universal specifications; per-code vehicle, engine and hardware applicability must be verified.

GM source, physical page 665.