P3452Cylinder 7 Deactivation/Intake Valve Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine lamp on, often only after longer warm drives
- Cylinder deactivation unavailable
- Likely causes
- LikelyCylinder 7 control wire shorted to a voltage feed
- PossibleLow-resistance coil in the cylinder 7 solenoid
- RareEngine control module driver defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.