P3460 code meaning
Cylinder 8 Deactivation/Intake Valve Control Circuit High
Powertrain system Generic code P34xx codes Check engine light
What P3460 means
P3460 reports a short to supply voltage on the control circuit of the cylinder 8 deactivation solenoid, found while the output is switched on. GM lists it for the 2019 L84: under 0.5 ohm between output and controller power, 20 of 25 samples spaced 250 ms apart, Type B, with the same 11 V and 425 rpm enable limits as the other cylinder 8 circuit checks. GM's table contains a slip here: the strategy column for P3460 speaks of the cylinder 7 solenoid, while code and component name cylinder 8. Typical causes are harness damage against a feed wire or a solenoid with shorted turns; the visible result is that the engine stops using cylinder 8 deactivation. Siblings: P3457 (open) and P3459 (short to ground).
P3460 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 P3460
- Check engine lamp on
- Cylinder deactivation inactive, slightly higher fuel use
Common causes of P3460
- Most likelyCylinder 8 control wire in contact with a voltage source
- PossibleShorted turns in the cylinder 8 solenoid
- Less likelyFaulty driver in the engine control module
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 P3460 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). |
| 60 | The exact fault in that area. |
What to do next
- Note P3460 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 P3460
What does P3460 mean?
P3460 means "Cylinder 8 Deactivation/Intake Valve Control Circuit High". P3460 reports a short to supply voltage on the control circuit of the cylinder 8 deactivation solenoid, found while the output is switched on. It is a generic code, so it means the same on every make.
Is it safe to drive with P3460?
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 P3460 fail an emissions test?
Yes, it can. P3460 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 P3460 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 P3460 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.