P06E4 code meaning
Control Module Wake-up Circuit Performance
Powertrain system Generic code P06xx codes Check engine light
What P06E4 means
Control modules are woken by a dedicated wake-up line or a network wake-up – at ignition on, when a charging cable is plugged in, or on a timer for engine-off diagnostics and battery management. P06E4 means this wake-up signal is implausible: the module wakes too late or not at all, stays awake, or the line state does not match the network status. In practice the code appears mainly on hybrids: FCA fixes it on the Pacifica plug-in hybrid and the Wrangler 4xe with module software, where it remained as a permanent code that blocked emission inspections; GM's hybrid integration module lists it as a fault bundle. No manufacturer publishes thresholds or timing.
P06E4 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P06E4
- Check engine light
- Permanent code blocks emission inspection
- Possibly battery drain (module stays awake)
Common causes of P06E4
- Most likelyModule software (false setting, permanent code does not clear)
- PossibleWake-up line or connector open or shorted
- PossibleWeak 12 V battery, voltage dips at wake-up
- Less likelyEngine or hybrid control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Wake up circuitEngine control moduleHybrid control module
What each part of P06E4 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| E4 | The exact fault in that area. |
What to do next
- Note P06E4 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 P06E4
What does P06E4 mean?
P06E4 means "Control Module Wake-up Circuit Performance". Control modules are woken by a dedicated wake-up line or a network wake-up – at ignition on, when a charging cable is plugged in, or on a timer for engine-off diagnostics and battery management. It is a generic code, so it means the same on every make.
Is it safe to drive with P06E4?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P06E4 fail an emissions test?
P06E4 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P06E4 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P06E4 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.