B1B22

Code

LAND ROVER B — Body

Key of identifier 20

Brand: LAND ROVER

Type: B — Body

Views: UK: 20 EN: 23 RU: 15

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Page language: EN

Causes

Key transponder (chip) damaged or not presenting a valid ID
Key battery depleted (for proximity / smart keys) preventing antenna wake-up
Key not programmed or lost from vehicle key set
Faulty immobilizer/BCM/module or corrupted key data in the module
Antenna ring or inductive coil (around ignition/steering column) fault or wiring/connectors poor
Intermittent CAN/serial communication between immobilizer and BCM/ECM

Symptoms

Engine will not start or no crank when using the affected key
Security/immobilizer warning lamp or message on dash
Remote/keyless entry functions inconsistent or non-functional from that key
Other keys may work normally (only the key with ID 20 affected)
Intermittent recognition or need to hold key in a specific position to start

What to check

Verify which key(s) trigger the code — test with known good/spare key
Check key fob battery voltage and replace battery if low
Visually inspect key for physical or water damage
Use OEM diagnostic tool to read stored key identifier list and confirm presence/absence of ID 20
Check immobilizer/BCM DTCs and freeze frame data for related communication errors
Inspect antenna ring/read coil wiring, connectors, and ground at the ignition/reader

Signal parameters

Key transponder ID / key identifier reported by immobilizer (value should match key label)
Antenna/read coil detect signal or voltage when key presented (LF coil wake-up)
Key fob battery voltage (V)
CAN/Serial messages between immobilizer and BCM (presence, error frames)
Immobilizer/module supply voltage and ground integrity
RF/inductive signal strength (where supported by diagnostics)

Diagnostic algorithm

Confirm symptom and attempt start with each available key to isolate affected key(s).
Check and, if required, replace the key fob battery; retest recognition and note any change.
Inspect the key for damage or corrosion. If suspect, try a known-good spare key.
Retrieve DTCs with an OEM-capable scanner (Jaguar/Land Rover IDS or equivalent). Record key IDs listed by the immobilizer and related communication codes.
Using diagnostics, verify the immobilizer recognizes the physical key transponder ID when presented to the reader. If the ID is missing or different, the key is not being read.
Inspect antenna ring/read coil and associated wiring/connectors at the steering column/ignition reader for damage, loose pins, or corrosion. Measure coil resistance per manufacturer spec.
Check module power, ground and CAN bus communication for errors. Repair any wiring or connector faults and clear codes.
Attempt key re-learn/programming per factory procedure for that model. If programming fails, capture any error messages from the tool.
If the key cannot be read but the antenna and wiring test good, try replacing/testing the immobilizer reader module. If module replacement is required, ensure proper programming/coding is completed.
After repairs or re-programming, clear codes and perform repeated start/recognition tests with each key. Monitor for re-occurrence and check for related module software updates or technical service bulletins.

Likely causes

Key battery dead or weak (easy, common)
Specific key not programmed / removed from stored keys (common)
Antenna ring or transponder reader fault (medium probability)
Immobilizer module software or memory corruption (less common)
Damaged key transponder (less common, especially if key dropped or exposed to water)

Fault status

⚠️ Status

Immobilizer: Key identifier 20 not recognized (key not authorized).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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LAND ROVER

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