What it means
The control module wake-up circuit signal is below the expected range. The code does not establish whether this prevents wake-up or keeps a module awake.
At a glance
- Usually lights the check-engine light
How it works
A wake-up circuit carries a signal that tells a control module to become active. The monitoring module checks the signal level against its expected range. P24F0 sets when the wake-up signal is too low, which can result from a short to ground, a stuck switch, or resistance in a connection.
Common causes
Most likely first.
- Wake-up wire shorted to ground
- Door, hood or terminal switch stuck closed
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Intermittent electrical functions
- A control module may not wake reliably
How to diagnose it
- Scan for related module communication and wake-up codes, and note which module or electrical functions fail to wake reliably.
- Inspect the wake-up wire and connectors for a shorted or pinched section, water intrusion, or corroded terminals.
- Check whether a door, hood, or terminal switch tied to the wake-up circuit is stuck in a state that holds the signal low.
- Using the wiring diagram, measure the wake-up signal at the affected module and compare it with the manufacturer's specification in the relevant key and switch states.
- Check voltage drop or connection resistance across suspect terminals and harness sections to find high resistance pulling the signal down.
- If the circuit wiring and switches pass, test the module's wake-up input according to the manufacturer's procedure.
Common fixes
- Free or replace a stuck door, hood, or terminal switch that is holding the wake-up signal low.
- Repair a wake-up wire shorted to ground or pinched against the body.
- Clean or replace corroded connector terminals causing high resistance.
- Repair the affected module only if its input fails the manufacturer's test.
Can I keep driving?
Use caution if important electrical systems wake intermittently; lighting, stability, or other module-controlled functions may not be dependable. Avoid driving when an essential system is unavailable and have the circuit checked promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.