Powertrain
generic / SAE
P24EF
Control Module Wake-up Circuit/Open
The wake-up line that brings a sleeping ECU back from low-power mode is open. Many networks use a dedicated hardware wake-up wire (door-latch trigger, terminal 15, CAN wake-up) so modules can stay asleep with the ignition off. Without it, the module either fails to wake up at start-up or stays awake and drains the battery.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / EF
Possible causes
- Broken wake-up wire or unplugged connector high
- Failed wake-up input stage in the module medium
- Pin pushed back out of connector body low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: wake up circuit
- Component: control module
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012