Low power mode after 2.5 hours driving

[OptimusMiles]

I have a little problem with my 28i.
Normally the car is absolutely fine but whenever I go on a longer journey, after about 2.5 hours the engine warning light come on and we go into low power mode.
Oil temp reads normal on the dash.
The next day after it’s cool down the car sorts itself after a short while and everything goes back to normal.
Any ideas?
I have bimmer code and fired it up yesterday when the fault came up.

387F
3447
2D61
2C58

There are probably more, I’ll plug in again later and have a proper look.

Thanks

 

[bigwinn]

Code​	Description​	Likely Cause​
387F	Power management: standby current violation	Weak battery, excessive battery drain, IBS sensor issue, charging system problem. Â
3447	Usually related to DME power management/communication (need engine variant for exact definition)	Often appears with battery voltage or electrical supply issues.
2D61	VANOS exhaust control fault – position not reached	Faulty VANOS solenoid, dirty oil, timing issue, worn VANOS actuator. BMW issued guidance on this fault family for E89 models. Â
2C58	Boost pressure control disabled as a consequential reaction	Often a secondary fault caused by another engine management issue (VANOS, air metering, sensor, or electrical fault).

 

[B21]

So possible cam chain wear..what year is it? Mileage?

 

[OptimusMiles]

…it’s a 2012 on 101k miles

 

[B21]

Yes likely worn cam chain causing timing fault..best guess, if oil regularly changed then actual VANOS on N20 fault rare..

I'd have someone look at the camchain sub system

 

[OptimusMiles]

Thanks for the suggestion, I’ll investigate!