Fault codes › Body › Manufacturer-specific › comfort, lighting or restraints

B1000 Control module fault

Needs attention Have it looked at soon. The car is usually driveable with care in the meantime.

What does B1000 mean?

B1000 is a manufacturer-specific body code: control module fault. The exact meaning can vary by make. It belongs to the comfort, lighting or restraints group of codes.

A control module stores the code when something it watches stays outside what it expects for long enough. On its own the code says which system complained, not which part has failed — the causes below, most likely first, are where to start.

Is it safe to drive with B1000?

Needs attention. Rarely affects driving; have it read by a specialist.

Common causes of B1000

Internal body module fault.
Power or earth problem.

Symptoms

Varies by vehicle — lighting, locking or comfort features misbehaving.

What to check first

Module supply and earth.
Manufacturer-specific diagnosis.

Can I just clear B1000?

You can, and the light goes out — but a fault that is still there sets the code again, often within a drive or two. Clearing also erases the freeze frame (what the engine was doing when the code was stored) and resets the emissions readiness monitors, so an MOT, smog or inspection test will wait until they have run again. Fix the cause first, then clear it, then watch whether it returns.

Read and clear B1000 from your iPhone with OBDTrip

Plug a Bluetooth OBD-II adapter into the car and OBDTrip reads every stored, pending and permanent code, explains each one in plain English like this, shows what the engine was doing when it was set, and clears the check engine light once the fault is fixed. It keeps a history of when each code comes back, and records every drive on its own from then on.

Needs a Bluetooth Low Energy adapter such as the Vgate iCar Pro — which adapters work with iPhone. Reading and clearing codes is part of an OBDTrip subscription.

General guidance from OBDTrip's fault-code catalogue, not a diagnosis of your car. When a code points to brakes, steering, overheating or a flashing check engine light, have the car looked at before driving on.