LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Alfa Romeo >> 2017 >> Giulia Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Cruise Control Systems >> (Active Cruise Control Module (Acc) - Electrical Diagnostics) >> DTC Troubleshooting >> C1450-86-Engine Speed Signal Fail From Engine Control Module (ECM) - Signal Invalid >> Possible Causes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Possible Causes

Possible Causes
DTCS SET IN THE POWERTRAIN CONTROL MODULE (PCM)
POWERTRAIN CONTROL MODULE (PCM)
ADAPTIVE CRUISE CONTROL (ACC) MODULE

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  STANDARD PROCEDURE  .