P2DA3Gear Shift Control Module B Overtemperature
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P2DA3 is a condition code: gear shift control module B reports that its internal temperature exceeds the safe limit. The circuit is fine, the module simply runs too hot. No manufacturer documents P2DA3 or a threshold publicly; Allison's 6th-generation controls, which give module 2 its own performance and communication codes, do not list it. Heat can enter from outside – a selector in a sun-heated console, a mounting close to heater ducts or other warm components – or arise inside, when output stages for display, lock solenoid or illumination draw too much current. A hot unit may reduce its functions until it cools. A code that also appears at normal temperatures points to an internal defect.
- What you may notice
- Shifter warning, mainly in hot weather or after long operation
- Second selector temporarily ignores range requests
- Fault disappears after the module has cooled down
- Likely causes
- PossibleStrong sun load or nearby heat source at the mounting location
- PossibleOutput stage for lock solenoid, display or lighting drawing excess current
- PossibleInternal defect or faulty temperature sensing in module B
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.