P3452 code meaning
Cylinder 7 Deactivation/Intake Valve Control Circuit High
Powertrain system Generic code P34xx codes Check engine light
What P3452 means
Unlike the open and ground-short checks, GM can only detect P3452 while the cylinder 7 solenoid driver is switched on, because a short to supply voltage shows up as an output that will not pull low when it should. The 2019 tables for the L84, L86 and LT4 set the limit at 0.5 ohm to controller power and need 20 errors out of 25 samples, Type B. The check therefore depends on the ECM actually commanding deactivation; on GM's DFM engines that only happens with coolant above 40 °C, more than 20 s after start and above 13 km/h, according to NHTSA. Typical causes are a harness pressed against a feed wire or a solenoid with shorted windings. P3449 and P3451 are the other circuit codes for cylinder 7.
P3452 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 P3452
- Check engine lamp on, often only after longer warm drives
- Cylinder deactivation unavailable
Common causes of P3452
- Most likelyCylinder 7 control wire shorted to a voltage feed
- PossibleLow-resistance coil in the cylinder 7 solenoid
- Less likelyEngine control module driver 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 P3452 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). |
| 52 | The exact fault in that area. |
What to do next
- Note P3452 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 P3452
What does P3452 mean?
P3452 means "Cylinder 7 Deactivation/Intake Valve Control Circuit High". Unlike the open and ground-short checks, GM can only detect P3452 while the cylinder 7 solenoid driver is switched on, because a short to supply voltage shows up as an output that will not pull low when it should. It is a generic code, so it means the same on every make.
Is it safe to drive with P3452?
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 P3452 fail an emissions test?
Yes, it can. P3452 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 P3452 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 P3452 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.