P3451Cylinder 7 Deactivation/Intake Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3451 means the switched ground line of the cylinder 7 deactivation solenoid has contact with ground somewhere along its way. GM documents the check for the L84 and L86 trucks and the LT4 Corvette (2019): with the driver off, less than 0.5 ohm to ground, 20 hits in 25 samples taken every 250 ms, Type B, meaning the warning lamp waits for a second faulty trip. According to GM, certain controllers log the open-circuit code P3449 along with it, so both codes together need not mean two faults. On the L84 the high-side feed of the same solenoid reports a ground short under its own code P3117. P3452 is the short to power on this channel, P3450 the mechanical fault.
- What you may notice
- Check engine lamp on after two trips
- P3449 may be stored as well
- No four-cylinder mode, higher fuel use
- Likely causes
- LikelyCylinder 7 control wire pinched or chafed to ground
- PossibleCylinder 7 solenoid shorted internally
- RareOil or water inside the solenoid connector
- RareDefective driver in the engine control module
- 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.