xDrive Acceleration Delay.

[allmightyASTON]

Good morning, everyone.

My N47 F31 has begun to exhibit significant hesitation during acceleration, resulting in a prolonged sense of sluggishness. Once at optimal velocity, it operates steadily and smoothly, devoid of any unpleasant sounds or other indications of malfunction.


During my recent trip, I observed that there is no hesitation during acceleration in 1st and 2nd gears, whereas the issue seems to begin from 3rd gear forward.

Initially, I suspected a Transfer Case malfunction; but, when recognizing that the problem mostly manifests from 3rd gear forward, I am now contemplating a gearbox issue.

I used ISTA+, which did not provide any fault codes for any component. However, when I scanned with Bimmerlink this morning, it documented the following codes:

Five faults in the central gateway module

101008: Non-resolvable ambiguous routing - SG absent from the SVT target table

101010: SIF error 100104: Hardware fault reason ZGW

100001: VcmResultSvtCheck - identification verification: Discrepancies between the actual SVT and the target SVT have been identified.

100204: Message monitoring: absence of system context signal 12

Two faults in motor electronics

27AC00: Internal DDE control unit (cyclical authentication): Program status verification failed
27AB00: Internal DDE control unit (cyclical authentication): data record verification failed 1C

Two faults in integrated chassis management

48276E: Autosar - StandardCore - Non-Volatile Memory - Integrity compromised 482656: Slip angle estimate - internal deterioration attributed to SBS


Does anybody possess insights or experiences about similar hesitation concerns, and if so, how were they resolved?

I own the ZF repair kit for the transmission and the appropriate fluid for the transfer case, which should address the issue; nevertheless, I anticipate that this may be too optimistic.

I appreciate your time in advance for reading this.

[nicebubby8]

My friend had a similar problem, occurring exclusively at certain speeds and gears, attributed to wrong tire sizing.
The only consideration I had was that torque requirements in various gears and RPM ranges caused it to manifest at particular intervals.

[allmightyASTON]

All tires are uniform and brand new. I have consistently changed them in sets of four, since I am aware that xDrive may be somewhat particular.

The issue has arisen unexpectedly, since everything was functioning well just a few days before. The engine operates smoothly in Neutral and functions optimally overall, mostly due to your work on the chains; thus, I suspect an issue with the gearbox or torque converter. It is disappointing because it does not generate a diagnostic code.

[allmightyASTON]

Update - I removed the TC fuse, and the vehicle operated flawlessly, confirming it was really a TC problem.

I replaced the fluid (about 450ml) and executed the calibration using ISTA+, resulting in the vehicle returning to a near-normal state.


I shall do another fluid change in about one week, since the fluid that was expelled was very dark and likely original from the manufacturer.

[DreamCatcher88]

Thank you for the forum; I am experiencing the same problem and same failure codes. 335D xDrive. I assume that by TC you are talking to the traction control fuse?

[DreamCatcher88]

Are you referring to the transfer case?

[nicebubby8]

It is perplexing that they no longer provide a drain cap, since it complicates the process of extracting the oil.
It is prudent to repeat the process in about one week if the condition was so severe.


I hope that resolves the issue completely.

I apologize for not seeing your previous post on the 21st.

[norbury.brook]

In this case, I believe you cannot disable the traction control.
However, I am elderly and may be mistaken, amusingly.

[nicebubby8]

That is the reason I mentioned the transfer case; I was under the impression that one cannot replenish the traction control fluid.