P24F0Control Module Wake-up Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P24F0 means that a control module drives its wake-up output on, but the line voltage stays down, pointing to a ground short or a load drawing far too much current. In GM's 2016 and 2019 hybrid tables the HPC2 module runs this check whenever the output is commanded on and reports a fault if the control voltage is at or below 5.52 V. Sampling every 12.5 ms, it needs 480 failures in a window of 560, roughly seven seconds; as a Type A code it lights the MIL on the first trip. The unit at the far end then never sees its wake signal and may stay off or drop out. Search the harness for a chafed spot or a wet connector. P24EF is the open-circuit fault, P24F1 the high one.
- What you may notice
- Malfunction indicator lamp on
- Hybrid or charging functions unavailable
- Likely causes
- LikelyWake-up line shorted to ground at a chafe point
- PossibleMoisture in a connector bridging the line to ground
- RareReceiving module loading the wake-up input too heavily
- 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
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.