What Does P3470 Mean?
The PCM detects that cylinder 9's exhaust valve control circuit is functioning but not performing within expected parameters. The solenoid responds but valve timing changes are too slow, erratic, or incomplete.
Common Causes
35%
Sluggish or sticking exhaust valve control solenoid due to carbon or debris
25%
Low engine oil level or pressure affecting hydraulic valve actuation
20%
Restricted oil passages to exhaust valve control system
12%
High resistance in wiring causing slow solenoid response
8%
Worn or damaged valve train components preventing proper deactivation
Diagnostic Steps
1
Step 1: Verify engine oil level is at proper mark and oil pressure meets specifications using mechanical gauge
2
Step 2: Monitor exhaust valve solenoid response time using scan tool while commanding activation/deactivation cycles
3
Step 3: Remove and inspect exhaust valve control solenoid for carbon buildup, debris in screen, or mechanical binding
4
Step 4: Measure solenoid electrical characteristics including resistance, inductance, and current draw during operation
5
Step 5: If solenoid tests acceptable, inspect valve train components and oil passages for restrictions or mechanical wear
Estimated Repair Cost
$150 - $950
Parts + labor, varies by vehicle and location
The PCM detects that cylinder 9's exhaust valve control circuit is functioning but not performing within expected parameters. The solenoid responds but valve timing changes are too slow, erratic, or incomplete.
The most common cause of P3470 (Cylinder 9 Exhaust Valve Control Circuit Performance) is: Sluggish or sticking exhaust valve control solenoid due to carbon or debris
Typical repair costs for P3470 range from $150 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Improper exhaust valve timing on cylinder 9 may cause reduced power, increased emissions, or engine vibration. Generally safe to drive but continued operation may damage catalytic converter or cause engine mechanical problems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3470 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Cylinder Deactivation System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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