P26DEEngine Sound Control A Circuit Performance
- 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
- Unlike the pure wiring codes, P26DE means the circuit of sound actuator A is electrically intact but the part does not behave as commanded, for example a flap that sticks, moves too slowly or reports an implausible position. The best documented case is Nissan's GT-R: bulletin NTB19-036, last amended in 2023 for model years 2017 to 2020, sets the check engine lamp with P26DE and names the electric control valve on the main muffler. The fix is either new engine software or replacing that valve on its own rather than the whole muffler. Ford's 2014 code list also carries P26DE with the lamp marking. Soot, corrosion and frozen moisture are typical reasons a flap binds. P26DB to P26DD cover open, low and high faults.
- What you may notice
- Check engine light
- Exhaust note no longer changes, or changes late
- Rattling or buzzing from the silencer area
- Likely causes
- LikelyExhaust sound valve sticking or worn
- PossibleEngine software with too strict an evaluation, update available from the maker
- PossibleFlap linkage blocked by deposits, ice or damage
- RareWeak actuator motor or faulty position feedback
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.