P0959Auto Shift Manual Mode Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- The signal reporting the selector lever in the manual gate drops out or toggles briefly while the lever is not moved, so the transmission control switches between manual and automatic mode on its own. The voltage is not stuck out of range as with P0957 or P0958 but jumps. Loose connector pins at the lever, a harness that flexes with the shifter or a worn microswitch are typical. A Hyundai patent shows such a microswitch actuated by the lever's sideways movement, a Nissan patent the two-contact mode switch. No manufacturer documents this exact code publicly; CARB requires circuit checks. P0955 is the general fault, P0954 the intermittent fault of the up/down circuit.
- What you may notice
- Manual mode switches on or off by itself
- Gear display flickers between D and manual gear
- Fault often appears on rough roads
- Likely causes
- LikelyLoose pins in the selector lever connector
- PossibleWorn or bouncing mode microswitch
- PossibleHarness damaged where it moves with the lever
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.