P2DEF code meaning
Cylinder 6 Intake Valve Lift Range/Performance
Powertrain system Generic code P2Dxx codes Check engine light
What P2DEF means
P2DEF covers cylinder 6, typically on a V6 or straight six: its intake valves do not reach the commanded lift or take too long to switch. Detection follows the same idea as for the other cylinders; for the driver the reaction matters more. GM's patent on stuck lift mechanisms reports which cylinder failed and whether it hangs in high or low lift, and the engine computer may then drive every mechanism into one default lift, stop further switching, limit engine speed and turn on the MIL. When several cylinders on one bank or the whole engine are off target, P2DF0, P2DF1 or P2DF2 are the matching codes instead. No manufacturer documents P2DEF publicly; CARB treats any lift error that raises emissions as an OBD fault.
P2DEF at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2DEF
- Check engine light on
- Engine speed limited or lift switching disabled (substitute mode)
- Cylinder 6 misfire, rough running
Common causes of P2DEF
- Most likelyLift mechanism of cylinder 6 stuck in high or low lift
- PossibleRestricted oil feed to the cylinder 6 element
- Less likelyActuator for cylinder 6 slow despite correct wiring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Intake valve lift actuator cyl 6VVT system
What each part of P2DEF means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| EF | The exact fault in that area. |
What to do next
- Note P2DEF 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 P2DEF
What does P2DEF mean?
P2DEF means "Cylinder 6 Intake Valve Lift Range/Performance". P2DEF covers cylinder 6, typically on a V6 or straight six: its intake valves do not reach the commanded lift or take too long to switch. It is a generic code, so it means the same on every make.
Is it safe to drive with P2DEF?
Drive gently and only to a workshop. With P2DEF the car can go into limp mode (reduced power) to protect itself.
Will P2DEF fail an emissions test?
Yes, it can. P2DEF 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 P2DEF to fix?
Difficulty: hard. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P2DEF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.