BMW 21A117: EME requests engine to start
BMW code 21A117 means the EME (Electric Motor Electronics) has asked the emergency run manager to switch on the petrol engine because something is limiting electric drive. It is a consequence code, not the root fault, and most commonly points to the EME inverter itself, the electric coolant pump or connector, or a weak 12V battery.
Quick facts
- System
- Hybrid Drive / Electric Motor Electronics
- Severity
- Serious
- Can you still drive?
- Short drives only, diagnose soon
- Applies to
- BMW plug-in hybrids using the EME: F15 X5 xDrive40e, F30 330e, F10/G30 530e, G12 740e, and related G05 45e with drift noted below.
Also shown by some scanners as: 21A117, bmw dtc 21a117, 21A111, 21A003, 21A11A, 21A124, 21A005, 235410
Symptoms
- Drivetrain malfunction message with reduced power
- Electric drive temporarily restricted or Max eDrive disabled
- Petrol engine cuts in immediately and stays on instead of running electric
- Hybrid battery will not charge or holds an unusually low state of charge
- Car sometimes clears after a restart then faults again, logged as intermittent
Common causes, most likely first
- 1
EME (Electric Motor Electronics) inverter module internal failure
Most common root cause reported for this code
- 2
Electric coolant pump failure or its connector contaminated by leaking PCV fluid
Covered under recall campaign 24V-608 on some models
- 3
Weak or failed auxiliary 12V battery feeding the engine start circuit
- 4
Corroded or loose EME earth and ground connection
Can trigger the code without the module itself being faulty
- 5
Starter motor fault preventing the switch from electric to hybrid drive
- 6
High voltage safety box or its internal current sensor
Less common, usually confirmed only after other causes are ruled out
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Frequently asked questions
Can I still drive with code 21A117?
In most cases the car still moves on the petrol engine with electric drive restricted, but this is a high voltage drivetrain fault so it should only be driven straight to the workshop. Tow it instead if drive power is lost, the car will not enter ready mode, or a red high voltage warning appears.
Does 21A117 always mean the EME module itself is faulty?
Not always. This code names the request to start the engine, not the exact underlying fault. It can come from the EME inverter, but just as often from the electric coolant pump connector, a weak 12V battery, or a corroded earth point. A proper diagnostic read is needed to confirm the exact sub-code and cause before ordering parts.
How do I fix code 21A117?
First get a proper diagnostic read to confirm which sub-code and system is behind the request. Depending on the finding, the fix path usually involves the EME inverter module, the electric coolant pump, the auxiliary 12V battery, an EME earth strap repair, the high voltage safety box, or the starter motor. WhatsApp us the code and car model for stock and today's price.
Which BMW models does code 21A117 apply to?
It applies to BMW plug-in hybrid models using the EME, including the F15 X5 xDrive40e, F30 330e, F10/G30 530e, G12 740e, and the newer G05 45e. Note that on the G05 45e the EME hardware and part numbers differ from the F-chassis cars, so diagnosis on one does not automatically transfer to the other.
