P341DDeactivation/Exhaust Valve Control Circuit Performance Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P341D appears once the bank 2 exhaust valves respond wrongly to a deactivation or reactivation request while the electrical side is intact. No manufacturer documents this code publicly. Timing is the critical part: a GM patent application has the exhaust valves stop before the intake valves when a cylinder is switched off and resume before them when it comes back, so that burnt gas is expelled and no fresh charge is trapped. GM's DFM V8, as NHTSA describes it, reverses this and stops the intake side first. If the exhaust side lags, the planned order breaks. CARB expects outputs like this to be checked for proper function. The circuit code for this bank is P340D, the bank 1 equivalent P341C, the intake function on bank 2 P341B. Expect a lamp, harsh mode changes and higher fuel use.
- What you may notice
- Check engine lamp on
- Bump or shudder during mode changes
- Higher fuel consumption
- Likely causes
- PossibleExhaust lifter or rocker on bank 2 switching late or not at all
- PossibleOil too thin, too old or too low for fast switching
- RareSluggish bank 2 exhaust actuator valve
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.