BMW Warning

BMW B1001 Fault Code — FRM — Configuration Data Lost

B1001 is a fault code stored on BMW vehicles and it means “FRM — Configuration Data Lost”. This page explains what the code means on the BMW side, the possible causes held in the CarCoding database, and where to start diagnosing.

Make
BMW
Code
B1001
System
Body and comfort
Severity
Warning

In short

  • BMW B1001 = FRM — Configuration Data Lost. This code is defined for BMW.
  • CarCoding classifies this code as warning severity under body and comfort.
  • The database lists 2 possible causes; freeze frame and live data decide which one applies — work by measuring, not by replacing parts.

What does BMW B1001 mean?

The control unit stores a standard fault code when a measurement falls outside its expected range. B1001 corresponds to FRM — Configuration Data Lost.

B1001 is a manufacturer-specific code: because its second digit is 1, it is defined by the manufacturer rather than by SAE/ISO. You will not find this code in a standard OBD-II list, and the same number can mean something completely different on another make.

For the make-independent standard definition: fault code B1001.

CarCoding files this code under Body and comfort. Body-side codes are stored when an output does not draw the expected current, a switch reports an impossible position, or comfort modules cannot reach each other. Standard codes in this group →

All BMW fault codes →

Vehicles supported in CarCoding: BMW models.

Possible causes

Possible causes the CarCoding database holds for BMW B1001:

  1. Programming required (ISTA)
  2. Coding needed after battery replacement

The order is not a probability ranking or a diagnostic sequence. The same code can have different causes on different vehicles, so treat the list as a starting set to be narrowed down by measurement.

How is it diagnosed?

The sequence below is not specific to B1001; it applies to OBD-II fault code diagnosis in general. These are the steps that are most often skipped:

  1. Read all the codes together. A single code is rarely the whole story; the other codes stored at the same time often point to the real cause.
  2. Read the freeze frame. The rpm, engine load, coolant temperature and speed at the moment the code was stored tell you under what conditions the fault occurred. It is the single most valuable piece of data you have.
  3. Identify which list the code is in. Confirmed (Mode 03), pending (Mode 07) and permanent (Mode 0A) codes are not the same thing. A code that appears only in the pending list means the fault has not been confirmed yet — most likely it is intermittent.
  4. Look at live data. Deliberately recreate the condition from the freeze frame and watch the relevant sensor values in real time. If you can reproduce the fault, you no longer have to guess.
  5. Clear and verify. After fixing the fault, clear the code (Mode 04), take a verification drive similar to the freeze frame conditions and read the pending codes again. An empty list means the fault is really gone.
The cost of clearing codes: Clearing also resets the emissions readiness monitors. Until those monitors return to “complete”, the vehicle may not pass an emissions test. So read and record the codes before clearing them.

Can you keep driving?

CarCoding classifies BMW B1001 as warning severity: it is not in the group that requires stopping immediately, but the fault will not clear itself. If you notice changed driving behaviour, loss of power, higher consumption or unusual noise, bring the diagnosis forward.

A stored code can also affect the emissions readiness monitors and the outcome of a roadworthiness test. How your vehicle behaves right now matters more than this general classification: if there is a red warning on the dashboard, do not keep driving.

Other BMW fault codes

Other manufacturer-specific codes for the same make:

All BMW fault codes →

Read BMW B1001 on your own vehicle

With an ELM327-based BLE OBD2 adapter, CarCoding reads confirmed, pending and permanent fault codes separately, pulls the freeze frame and explains every code in plain language. Clearing codes is done from the app as well. The app is free to download.

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Some advanced features require an in-app purchase.

Frequently asked questions

What does BMW fault code B1001 mean?

BMW B1001 means “FRM — Configuration Data Lost”. In the CarCoding database it sits in the Body and comfort group with warning severity. This code is manufacturer-specific; it does not appear in standard OBD-II code lists.

What are the possible causes of BMW B1001?

The CarCoding database lists the following possible causes for BMW B1001: Programming required (ISTA); Coding needed after battery replacement. This list is not a diagnostic order; measurement decides which one applies.

Can you drive with fault code BMW B1001?

BMW B1001 is in the warning severity class: it is not in the group that requires stopping immediately, but the fault will not clear itself. If you notice changed driving behaviour, loss of power or higher consumption, bring the diagnosis forward. Base the decision on how the vehicle behaves right now and on the freeze frame data.

Will clearing BMW B1001 fix it?

Clearing a code (OBD-II Mode 04) only resets the record in the control unit and the warning lamp; if the fault is still present the code returns once the verification cycle completes. Clearing also resets the emissions readiness monitors, so clearing codes before an emissions test can cause the vehicle to fail. The right order is: record the code and the freeze frame, fix the fault, clear the code, take a verification drive and read the pending codes again.

Data source: the CarCoding fault code database. Code definitions follow the SAE J2012 standard; manufacturers may use different wording for their own codes. Everything on this page is generated from the code-specific database records.

Disclaimer: This page offers general diagnostic guidance and does not replace an inspection by a qualified workshop. Any work carried out on the vehicle is your own responsibility.