P06E4: 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. 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.

Symptoms

• Check engine light
• Permanent code blocks emission inspection
• Possibly battery drain (module stays awake)

Most likely causes

• Module software (false setting, permanent code does not clear)
• Wake-up line or connector open or shorted
• Weak 12 V battery, voltage dips at wake-up
• Engine or hybrid control module faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the battery and grounds
2. Compare the reading with other engine data while varying the engine speed.
3. Clear the code and see if it returns
4. If it is a reference voltage code, disconnect sensors one at a time and see if the voltage recovers
5. Check whether a software update is available
6. Do not replace the control module without a full diagnosis

Good to know

• Repair difficulty: medium

What each character of P06E4 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 6: Control modules and outputs
• E4: Specific fault in that system

Frequently asked questions

Can I keep driving with code P06E4?

It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

What causes code P06E4?

The most common causes are: module software (false setting, permanent code does not clear); wake-up line or connector open or shorted; weak 12 V battery, voltage dips at wake-up.

Related codes

• P0685ECM/PCM Power Relay Control Circuit/Open
• P0686ECM/PCM Power Relay Control Circuit Low
• P068AECM/PCM Power Relay De-Energized Performance Too Early
• P068BECM/PCM Power Relay De-Energized Performance Too Late
• P2534Ignition Switch On/Start Position Circuit Low

Sources

• static.nhtsa.gov: MC 10215945 9999
• static.nhtsa.gov: MC 10248033 9999
• static.nhtsa.gov: MC 11001128 0001
• gsi.ext.gm.com: 15OBDG02 Engine Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.