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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (2.9L Pcm 1 - DTCS P3406-00 To U143B-00) >> DTC Troubleshooting >> P3420-00-Cylinder 3 Deactivation/Intake Valve Control Circuit High >> Possible Causes

Possible Causes

WARNING: This page is about a different variant/trim than selected.
Possible Causes
MDS 1 CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
POWERTRAIN CONTROL MODULE (PCM)

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

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