P3485 code meaning
Cylinder 11 Exhaust Valve Control Circuit/Open
Powertrain system Generic code P34xx codes Check engine light
What P3485 means
P3485 is triggered by an open circuit on a separate exhaust valve actuator at cylinder 11. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. Bentley's engineers say their W12 shut-off leaves both valve sets working, and they rotate the dormant bank to keep it hot; Lamborghini's Aventador V12 and Audi's group V10 likewise talk only about banks. No published system on an engine of this size switches the exhaust valve of an individual cylinder. A GM patent explains why exhaust timing is a topic of its own: its hydraulic control valves deactivate the exhaust valves first and bring them back first. Electrically, treat P3485 like any open actuator line. P3487 and P3488 report shorts, P3486 a functional fault.
P3485 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 P3485
- Check engine lamp on
- Engine no longer drops to half its cylinders
Common causes of P3485
- PossibleOpen wire to the cylinder 11 exhaust actuator
- PossibleCoil of the cylinder 11 exhaust actuator open
- PossibleConnector at the exhaust actuator corroded
- Less likelyEngine control module output defective
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 P3485 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). |
| 85 | The exact fault in that area. |
What to do next
- Note P3485 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 P3485
What does P3485 mean?
P3485 means "Cylinder 11 Exhaust Valve Control Circuit/Open". P3485 is triggered by an open circuit on a separate exhaust valve actuator at cylinder 11. It is a generic code, so it means the same on every make.
Is it safe to drive with P3485?
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 P3485 fail an emissions test?
Yes, it can. P3485 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 P3485 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 P3485 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.