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Home / DTC / B1BA0 — Excessive requests for challenge or attempts to start in mode storage

B1BA0 — Excessive requests for challenge or attempts to start in mode storage

Detailed page for trouble code B1BA0.

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B1BA0

LAND ROVER B — Body

Excessive requests for challenge or attempts to start in mode storage

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or intermittent key transponder (weak battery or damaged key)
  • Damaged or misaligned immobiliser antenna ring (key reader)
  • Poor wiring/connector connection between antenna, BCM, immobiliser or gateway module
  • Faulty body control/security module or firmware/software error
  • Repeated attempted starts (user or attempted theft) while vehicle in storage mode
  • Aftermarket alarm/immobiliser or remote starter interfering with transponder communications

Symptoms

  • Vehicle fails to recognise key or immobiliser lamp flashes when attempting start
  • No-crank or crank/no-start condition intermittently
  • Security/Immobiliser warning or message displayed on instrument cluster
  • Unexpected entries in security module event log (multiple challenges or start attempts)
  • Keyless entry/start may be unreliable or unresponsive
  • Possible parasitic battery drain if repeated wake events occur

What to check

  • Read and record stored DTC(s) and freeze-frame data with a capable manufacturer scan tool
  • Check for related codes on BCM, immobiliser and engine modules (U- and B- codes)
  • Verify vehicle battery voltage and supply to security modules
  • Try starting with a known-good/spare programmed key
  • Check key fob battery and replace if low
  • Observe immobiliser indicator light behaviour during key presentation and start attempt

Signal parameters

  • Count of challenge/response attempts recorded by security module
  • Key transponder ID presence/recognition status
  • Ignition switch/start request signal timestamps
  • Antenna coil resistance or voltage during key present test
  • Battery/ignition supply voltage to immobiliser/BCM during wake and start attempts
  • CAN gateway messages between BCM, immobiliser and ECU (comms status)

Diagnostic algorithm

  1. Capture full scan report from all modules (BCM, immobiliser/security, engine, gateway). Note related codes and times.
  2. Verify vehicle battery and charging system; ensure stable supply (clear low voltage as a variable).
  3. Check/replace key fob battery; attempt with factory spare key to rule out key transponder failure.
  4. Reproduce issue: with scan tool connected, attempt starts while monitoring security module live data (challenge counts, key ID recognition).
  5. Inspect and measure antenna ring/reader: check connector, continuity and coil resistance according to manufacturer data. Replace antenna ring if out of spec or damaged.
  6. Inspect wiring harness and connectors between antenna ring, BCM and immobiliser module; repair any corrosion, chafing or intermittent connections.
  7. If an aftermarket alarm or remote starter is fitted, disconnect its interface and retest.
  8. If communications errors are present (U-codes), trace CAN wiring and connectors; repair and retest.
  9. If hardware checks pass, review module software level and available technical service bulletins; perform reflash or module reprogramming with manufacturer tool if applicable.
  10. If immobiliser module is confirmed faulty after testing, follow manufacturer procedure for module replacement and key reprogramming. Always re-check for recurrence after repair.
  11. If signs of attempted theft or tampering are present, advise owner and consider security inspection by a specialist/dealer.

Likely causes

  • Weak/dead key fob battery or damaged key transponder
  • Faulty or open/shorted antenna ring or its connector
  • Loose or corroded connector(s) at the security/BCM/antenna harness
  • Intermittent BCM/immobiliser module fault or software anomaly
  • Aftermarket device causing repeated wake/commands to security system

Fault status

⚠️ Status
Security module recorded excessive immobiliser challenge or excessive start attempts while vehicle was in storage/sleep mode. May indicate faulty key/transponder, antenna/harness fault, module communication error, or repeated/unauthorised start attempts.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0422 P0606 B1A00
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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