P34xx OBD-II Codes (P3400–P3499)

100 fault codes in the P34xx range. Click any code for causes, diagnostic steps, severity, and common fixes.

Cylinder Deactivation System (Bank 1)

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Cylinder 4 Deactivation / Intake Valve Control Circuit High (GM/Chrysler V8 cylinder-deactivation)

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Cylinder 5 Exhaust Valve Control Circuit Performance — cylinder-deactivation valve solenoid (Chrysler/GM and others)

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Cylinder 6 Exhaust Valve Control Circuit / Open — cylinder-deactivation, AFM/DoD V8 (GM; also Honda/Chrysler systems)

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

Manufacturer-specific powertrain code — definition not reliably documented; its meaning varies by make, model, and year, so confirm it against your manufacturer's service information

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