P340ADeactivation/Intake Valve Control Circuit Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P340A is meant for engines that switch the intake valves of a whole bank through a shared control circuit, rather than one solenoid per cylinder. It reports an electrical fault in that bank 1 circuit, without saying whether it is open or shorted. No manufacturer documents this code publicly, which leaves it without known limits; CARB merely demands that outputs of this kind be monitored for breaks and shorts. The common systems are built per cylinder: GM's DFM V8 has one solenoid per cylinder in the valley, so faults go to codes such as P3401. Honda's VCM V6 reports bank-level trouble as P3400. Bank 2 is P340B, the exhaust side P340C, the bank 1 function check P341A. Expect a warning lamp and no reduced-cylinder mode.
- What you may notice
- Check engine lamp on
- Cylinder deactivation disabled on bank 1
- Higher fuel consumption at light load
- Likely causes
- PossibleDamaged, open or shorted wire in the bank 1 control circuit
- PossibleCorroded or loose connector at the bank 1 actuator
- PossibleBank 1 intake deactivation actuator with open or shorted coil
- RareOutput stage fault 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.