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B2191 fault code: what it means

B2191: Key ID not recognised by the BCM (difference of key). Engine will not start with that key; steering lock may not release.

Body · Minor

Usual causes, most likely first

  1. unregistered key
  2. Intelligent Key battery flat
  3. key registration needed

B2191 by make

Nissan

Key ID not recognised by the BCM (difference of key). Engine will not start with that key; steering lock may not release.

Usual causes: unregistered key; Intelligent Key battery flat; key registration needed

Not sure what B2191 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.