P3492 code meaning
Cylinder 12 Deactivation/Intake Valve Control Circuit High
Powertrain system Generic code P34xx codes Check engine light
What P3492 means
P3492 records a high condition on the control circuit of the cylinder 12 deactivation or intake valve actuator, generally a short to a supply voltage seen while the output is commanded on. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. The Variable displacement overview notes that a V12 can stop up to six cylinders, and the production engines doing so (Mercedes M137, Lamborghini Aventador, Bentley W12) differ widely in method, from a hydraulic solenoid pack (M137) to bank shut-off with the valves left running (Bentley). Only a design with valve actuators has a cylinder 12 actuator to short. Expect deactivation to be inhibited and the engine to run on all twelve. P3489 and P3491 are the electrical siblings, P3496 the exhaust high code.
P3492 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P3492
- Check engine lamp on
- Engine runs permanently on twelve cylinders
Common causes of P3492
- Most likelyCylinder 12 control wire shorted to supply voltage
- PossibleShorted turns in the cylinder 12 actuator
- Less likelyEngine control module output damaged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder deactivation solenoidWiring harnessECM
What each part of P3492 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 3 | Mixed range: generic and manufacturer-specific codes. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 92 | The exact fault in that area. |
What to do next
- Note P3492 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P3492
What does P3492 mean?
P3492 means "Cylinder 12 Deactivation/Intake Valve Control Circuit High". P3492 records a high condition on the control circuit of the cylinder 12 deactivation or intake valve actuator, generally a short to a supply voltage seen while the output is commanded on. It is a generic code, so it means the same on every make.
Is it safe to drive with P3492?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P3492 fail an emissions test?
Yes, it can. P3492 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P3492 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P3492 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.