L0008 - Invalid Key: Key Authentication Unsuccessful

Fault Code

Possible cause

Action

L0008

or

Alarm/immobiliser warning indicator light is on when the ignition switch is at the ON position (only visible on motorcycles without the accessory alarm fitted)

Invalid key: Key authentication unsuccessful

Check that the key has been registered with the immobiliser control module, if it is a new key or an additional key.

Check that there are no additional keys with a transponder chip fitted close to the ignition key and proceed to pinpoint test 1:

Subheading - Pinpoint Test

Pinpoint Tests

Test

Result

Action

1

If available, try to start the motorcycle with the second registered key:

OK

Transponder chip in the key not functioning correctly. Register a new key using the Triumph Diagnostic Tool then proceed to test 5

Faulty

Proceed to test 2

2

Check the condition of cable, connector housing and terminals for the following:

- Ignition switch

- Immobiliser control module

OK

Disconnect the ignition switch, proceed to test 3

Faulty

Rectify fault, proceed to test 5

3

Check antenna coil resistance:

- Ignition switch pin 2 to ignition switch pin 7

7 Ohms to 13 Ohms

Proceed to test 4

Faulty

Replace the ignition switch, register new keys and proceed to test 5

4

Check cable continuity:

- Ignition switch pin 2 to Immobiliser control module pin 5

- Ignition switch pin 7 to Immobiliser control module pin 10

OK

Proceed to test 4

Faulty

Rectify fault, proceed to test 5

5

Reconnect harness, clear fault code and run engine.

OK

Action complete - quit test

Fault still present

Contact Triumph service

Subheading - Circuit Diagram

Circuit Diagram

L0008 - Invalid Key: Key Authentication Unsuccessful - Circuit Diagram - LG1; LGX

Immobiliser control module communication LG1
  1. Engine ECM Connector C

  2. Immobiliser/TPMS Control Module

  3. Fuse Box

  4. Ignition Switch