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Body electronics

B1000 Control module internal fault

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B1000 means: Control module internal fault. The body electronics (lights, doors, climate, windows, keys) found a fault. OK to drive, but have it checked soon. The most common repair costs about €120–220 in Estonia, depending on make and model. The most common cause: low battery voltage.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.
Battery replacement€120–220parts and labour in Estonia, depending on make and model

What it means

The body electronics (lights, doors, climate, windows, keys) found a fault. It usually doesn't affect the engine.

This is a make-specific code (several makes). The exact meaning can vary by model and year.

What you may notice

  • A comfort function doesn't work
  • Warning on the dashboard

What could be wrong

  1. 1Low battery voltage · Battery replacement €120–220
  2. 2Wire or connector (often in the door hinge loom) · Wiring or connector repair €45–90
  3. 3Faulty switch, motor or sensor · Switch replacement €50–100
  4. 4Module software or the module itself · Control unit check and software €150–300

Repair difficulty: Moderate

What you can check yourself

Check the battery and the fuse. If the fault appeared after a battery change, relearning the function may help. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We read the module codes and data
  2. We check the supply and wiring
  3. We relearn the function or replace the switch or module

Standard SAE description: ECU Malfunction (internal)

Check the fuse · If a light, the horn, wipers, a socket or the fuel pump is dead, a blown fuse may be the cause.Fuse boxes by car →

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

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Questions

What does fault code B1000 mean?

Control module internal fault. The body electronics (lights, doors, climate, windows, keys) found a fault. It usually doesn't affect the engine.

Can I drive with code B1000?

OK to drive, but have it checked soon.

How much does it cost to fix B1000?

It depends on the cause: battery replacement €120–220; wiring or connector repair €45–90; switch replacement €50–100. Prices include labour at €45/h, depending on make and model.

How is B1000 fixed?

We read the module codes and data. We check the supply and wiring. We relearn the function or replace the switch or module.

Related codes

B1352Key-in-ignition circuit faultB2477Module configuration faultB1342Control module defective

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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