P24F0 code meaning
Control Module Wake-up Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P24F0 means
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.
P24F0 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24F0
- Malfunction indicator lamp on
- Hybrid or charging functions unavailable
Common causes of P24F0
- Most likelyWake-up line shorted to ground at a chafe point
- PossibleMoisture in a connector bridging the line to ground
- Less likelyReceiving module loading the wake-up input too heavily
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wake up circuitControl module
What each part of P24F0 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| F0 | The exact fault in that area. |
What to do next
- Note P24F0 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P24F0
What does P24F0 mean?
P24F0 means "Control Module Wake-up Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P24F0?
Drive gently and only to a workshop. With P24F0 the car can go into limp mode (reduced power) to protect itself.
Will P24F0 fail an emissions test?
Yes, it can. P24F0 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P24F0 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P24F0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.