OBD2 Car ScannerWhat does P3491 mean?
P3491 stands for Cylinder 12 Deactivation/Intake Valve Control Circuit Low. This is a manufacturer-specific code: its exact meaning can differ between car brands. The description below is the most common one.
Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Look up the code for your exact make and model
- Check for related generic (P0) codes
- Ask a dealer or specialist if unsure
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does P3491 mean?
P3491 means “Cylinder 12 Deactivation/Intake Valve Control Circuit Low”. It belongs to the manufacturer-specific code group: This is a manufacturer-specific code: its exact meaning can differ between car brands. The description below is the most common one.
Is it safe to drive with P3491?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear P3491?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- P3487Cylinder 11 Exhaust Valve Control Circuit Low
- P3488Cylinder 11 Exhaust Valve Control Circuit High
- P3489Cylinder 12 Deactivation/Intake Valve Control Circuit/Open
- P3490Cylinder 12 Deactivation/Intake Valve Control Circuit Performance
- P3492Cylinder 12 Deactivation/Intake Valve Control Circuit High
- P3493Cylinder 12 Exhaust Valve Control Circuit/Open
- P3494Cylinder 12 Exhaust Valve Control Circuit Performance
- P3495Cylinder 12 Exhaust Valve Control Circuit Low
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.