P3488 code meaning
Cylinder 11 Exhaust Valve Control Circuit High
Powertrain system Generic code P34xx codes Check engine light
What P3488 means
With P3488, the cylinder 11 exhaust actuator line sits too high, most often since the wire has picked up battery voltage. No manufacturer documents this code publicly; cylinders 9 to 12 only exist on engines with nine or more, and J2012 keeps these codes for them. Later V12 and W12 designs give it no job: Bentley's W12 idles a bank of six with its valves still moving, while the Aventador from Lamborghini parks one bank under 135 km/h. Only Mercedes' V12 of around 2000 uncoupled exhaust valves, using two solenoids for that bank. GM's comparable V8 check calls a circuit high below 0.5 ohm to supply while the driver is on, 20 of 25 samples, Type B. The actuator then cannot be engaged, and the engine just runs on all cylinders. P3487 is the ground fault.
P3488 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 P3488
- Check engine lamp on
- Engine stays on all twelve cylinders
Common causes of P3488
- Most likelyControl wire of the cylinder 11 actuator touching a battery feed
- PossibleShorted turns in the actuator coil
- Less likelyOutput stage in the engine control module failed
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 P3488 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). |
| 88 | The exact fault in that area. |
What to do next
- Note P3488 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 P3488
What does P3488 mean?
P3488 means "Cylinder 11 Exhaust Valve Control Circuit High". With P3488, the cylinder 11 exhaust actuator line sits too high, most often since the wire has picked up battery voltage. It is a generic code, so it means the same on every make.
Is it safe to drive with P3488?
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 P3488 fail an emissions test?
Yes, it can. P3488 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 P3488 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 P3488 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.