General topics » Return of Limp Mode

Well, the last fix, a re-flash of the ECU software in May 2020, has just failed with the reappearance of a throttle valve fault and limp mode operation. That's 9200-miles ago, but the latest event occurred after a 45-mile run on a US Interstate with a lot of truck (lorry) traffic. And, for those non-Americans, US highways aren't known for generous or paved berms (aprons).

Anybody else having these adventures?

Could you drop one of your blue pills in the petrol tank? That might cure its limp mode

Have you tried unplugging and re-plugging the connectors to the throttle valves? I suggest this because I once had a fuel injector fault and fixed it by doing that to the electrical connector. Apparently resistance can build up in the connectors and re-plugging them fixes that.

Zitat von Bravo im Beitrag #2

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Could you drop one of your blue pills in the petrol tank? That might cure its limp mode

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Zitat von Tod1d im Beitrag #3

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Have you tried unplugging and re-plugging the connectors to the throttle valves? I suggest this because I once had a fuel injector fault and fixed it by doing that to the electrical connector. Apparently resistance can build up in the connectors and re-plugging them fixes that.

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Zitat von Bravo im Beitrag #2

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Could you drop one of your blue pills in the petrol tank? That might cure its limp mode

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took my rs1200 out this morning for what was going to be a nice ride out meeting my mate on his new to him 2019 RT. got around the corner and limp mode plus yellow warning triangle and the engine symbol illuminated .
Bike serviced Frida so naturally one would start jumping to conclusions!
Also yesterday I fitted my bar rises that went on very easily with no raught cables.
Also readapted my bark busters in view of them not hitting the puig screen when on full lock. Also washed the bike
so after pondering and looking at the forum, i took out the tools. end screw on the barkbuster I had tightened to prevent the guard slipping was tight and when I slacken it I could rev the engine properly again, still had light but the throttle response even tho I had statically tested yesterday but did not take it for a run.
Then i moved the cables under the hub (mode hub etc ) and waning triangle was off when I started the motor again.
so I have undone the plastic shroud to the left of the throttle and checked the wiring, nothing obvious found and no water ingress.
Re assembled and tested .
Back to normal and throttle responsive.
So either the issue will return or maybe not, im summising the fault is wiring connection/sensor or damp.
the should i'm referring to doesn't look like its a very tight fitted water proof unit neither and thinking maybe some silicone would maybe worth while when reassembling.
It may help others with this problem tho and thought it would be good to share .

Thanks for sharing but lots of coincidences there. I would still go back to the dealer to see if a fault code has been stored.

Zitat von Ray im Beitrag #8

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Thanks for sharing but lots of coincidences there. I would still go back to the dealer to see if a fault code has been stored.

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Yes food for thought Ray.
It would do no harm, and if it has stored a fault maybe they can detect where to look for diagnosing where/if there is a fault.

Apologies too as I just read over my post and I never proof read it.

It was difficult to understand what I was saying in that post. In a hurry !

Thanks for getting back Ray and Mr 36654

At about 1000-miles since the last limp mode event (at 27500-miles), I had another one. In both cases, the limp mode occurred while engine braking (nearly closed throttle) running downhill.

Tomorrow, I'll read the codes.

Update, same fault codes as previously, 21F961 & 21F971, "Out of Range" readings. I updated the service department at my dealership and asked about service. According to the service department, the latest BMW AG fix is cleaning the pin connections at the DME Control Module. Unfortunately, I can't get a service appointment until early October.

That's a bummer.
If I remember correctly your bike has a regular key.
I would start parking in bad neighborhoods and leave the key in the ignition :)
Remember to not park near any Harleys because a thief will never notice your bike.

Zitat von Lee im Beitrag #13

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That's a bummer.
If I remember correctly your bike has a regular key.
I would start parking in bad neighborhoods and leave the key in the ignition :)
Remember to not park near any Harleys because a thief will never notice your bike.

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Took my bike in today for the current BMW specified service for random limp mode events. The latest BMW theory is some of the dielectric grease/sealant used in the first couple of years of R1200LC production could corrode and cause electrical connection issues at the ECU. According to BMW, this really works....