From Ross-Tech Wiki

18538/P2106 - Throttle Valve Actuator Module (J338): Power Limited due to Malfunction

Possible Symptoms

  • MIL on
  • Engine performance

Possible Causes

  • Throttle Body issue
  • Wiring Harness issue
  • ECM issue

Possible Solutions

  • Follow test plan for Throttle Body testing, see Factory Repair Manual

Special Notes

  • When found on the Audi 3.2L FSI engine, there may be a firmware update:
    • TSB 01-05-05
    • TSB 01-05-06