P3481Cylinder Deactivation (AFM/DoD)

Cylinder 8 Deactivation/Intake Valve Control Circuit/Open

P3481 indicates an open or malfunction in the cylinder 8 deactivation or intake valve control circuit on a GM AFM/DoD engine. Points to the cylinder 8 lifter oil manifold solenoid or its wiring.

🚗 Yes usually, but a stuck lifter risks valvetrain damage.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Cylinder 8 AFM solenoid open or failed$300-$700

40%

The lifter oil manifold solenoid for cylinder 8 is open or not responding.

#2Open or corroded wiring / connector$100-$300

30%

Break in the control circuit to the solenoid.

#3Stuck or collapsed cylinder 8 lifter$1200-$2500

20%

A failed deactivating lifter on cylinder 8.

#4Low oil pressure$50-$300

10%

Low oil pressure prevents lifter actuation.

🩺 Common Symptoms

Check engine light
Lifter tick
Misfire on cylinder 8
Rough idle
Reduced power

💰 Repair Cost: DIY vs Shop

DIY Cost

$100-$700

Shop Cost

$300-$2500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P3481

1Check for cylinder 8 misfire codes

2Inspect the cylinder 8 solenoid connector and wiring

3Test solenoid resistance and command it with a scan tool

4Replace the solenoid or lifter as needed

❓ Frequently Asked Questions

What is P3481?

An open or fault in the cylinder 8 deactivation valve control circuit, typically the AFM solenoid or wiring.

Can a lifter cause P3481?

Yes, a stuck cylinder 8 AFM lifter can set it, usually with a tick and misfire.

How much to fix P3481?

Wiring or solenoid repair is a few hundred dollars; a lifter job runs $1500 or more.

🔗 Related Codes

P3400P3485P0308P0300