P24EFControl Module Wake-up Circuit/Open

How the car detects it: Some control modules drive a discrete wake-up output that switches other units on before or alongside the network. P24EF reports an open circuit on that line. GM uses it in the HPC2 battery-side processor of its 2016 and 2019 hybrid tables: with the output commanded off, a control voltage between 2.82 and 7.04 V counts as open, because an intact line would be pulled clearly low. The test samples every 12.5 ms and fails when 480 of 560 samples are bad, about seven seconds; it is Type A, so the MIL comes on after one trip. A broken wire, a backed-out pin or a module with a failed output are the typical reasons. The driver may face a module that does not wake up. P24F0 and P24F1 are the low and high faults.
What you may notice: Malfunction indicator lamp on
Connected module stays asleep, with related communication codes
Likely causes: LikelyBroken wake-up wire in the harness
PossiblePin pushed back or corroded in a module connector
RareWake-up output of the control module defective
Inspection (ITP): Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
Repair: Hard · Usually a job for a workshop.Typical cost: €100 – €900
Related codes: P24F0
P24F1

Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.