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Home / DTC / P1622 — Engine control module malfunction input code engine immobilizer

P1622 — Engine control module malfunction input code engine immobilizer

Detailed page for trouble code P1622.

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P1622

LAND ROVER P — Powertrain

Engine control module malfunction input code engine immobilizer

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or unrecognized key/transponder
  • Antenna coil (immobilizer reader) fault or wiring open/short
  • Poor ground or low battery/vehicle supply voltage
  • Faulty immobilizer module or Body Control Module (BCM)
  • ECM internal fault or corrupted software/calibration
  • CAN bus or communication wiring fault between modules

Symptoms

  • Engine will not start (cranks or no-crank depending on vehicle)
  • Starter cranks but engine does not fire
  • Immobilizer/security warning lamp illuminated or flashing
  • Intermittent starting issues or random shut-downs
  • No communication with ECM/immobilizer module on a scan tool
  • Vehicle may start only with certain keys or after multiple attempts

What to check

  • Read all stored codes with a capable scan tool (ECM, BCM, immobilizer/security module). Note freeze-frame and related U-codes.
  • Check battery voltage (should be >12.2 V while cranking) and secure battery terminals.
  • Verify key is recognised: try known-good/programmed spare key.
  • Inspect fuses and relays for ECM and immobilizer circuits.
  • Visual inspection of antenna coil and ignition barrel; check connectors for corrosion or damage.
  • Check wiring harness continuity between antenna/immobilizer and BCM/ECM; inspect grounds.

Signal parameters

  • Transponder ID read / Key ID present or absent
  • Immobilizer module status (armed/disarmed/communication OK)
  • Voltage supply to immobilizer module and antenna coil (approx battery voltage)
  • Antenna coil resistance/continuity (manufacturer spec)
  • CAN bus messages between immobilizer/BCM and ECM (presence and frequency)
  • ECM input pin state for immobilizer code (valid/invalid or pulsed signal)

Diagnostic algorithm

  1. Confirm the customer complaint and verify P1622 is current or historic. Record freeze-frame and any concurrent codes (U-codes, other P-codes).
  2. Check battery voltage and charging system. Low voltage can cause module comms faults; restore normal voltage before further testing.
  3. Attempt to start with a known-good/programmed spare key. If vehicle starts with spare, suspect primary key transponder or key programming.
  4. Inspect ignition barrel/antenna coil area and connectors. Measure antenna coil resistance and compare to spec (manufacturer data required).
  5. Scan immobilizer/security module and BCM for status and events. Confirm whether the immobilizer module is receiving and sending key ID to the ECM.
  6. Check fuses and power/ground for immobilizer, BCM and ECM circuits. Repair any poor grounds or open circuits.
  7. Use a scope or scan tool capable of showing CAN traffic to verify communication between immobilizer/BCM and ECM. Investigate any CAN errors or lost-communication codes.
  8. If wiring and connectors are good but communication or recognition fails, follow manufacturer reprogramming/relearning procedure for keys/immobilizer. Use OEM tools to attempt re-flash if software corruption suspected.
  9. If immobilizer module or ECM is confirmed faulty by substitution or bench testing, replace only after verifying keys and immobilizer data are retained/reprogrammed per manufacturer procedure.
  10. Clear codes and perform a full functional test including multiple key starts and a road test to confirm repair.

Likely causes

  • Key transponder not recognized (worn, damaged, or unprogrammed spare key)
  • Antenna coil around ignition barrel has failed or connector loose
  • Loss of communication between immobilizer module and ECM (CAN/UART)
  • Blown fuse or poor supply to immobilizer/ECM circuit
  • ECM not accepting immobilizer code due to failed module or software mismatch

Fault status

⚠️ Status
ECM reports invalid or missing immobilizer input code. The engine management system is not receiving/accepting a valid security authorization from the immobilizer; vehicle may be immobilized until communication or authorization is restored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4 hours

Similar codes

P1620 P1621 P1623 U0100 U0073
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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