Powertrain, generic (extended)

P2DA3 Gear Shift Control Module B Overtemperature

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Strong sun load or nearby heat source at the mounting location
Output stage for lock solenoid, display or lighting drawing excess current
Internal defect or faulty temperature sensing in module B

Symptoms

  • Shifter warning, mainly in hot weather or after long operation
  • Second selector temporarily ignores range requests
  • Fault disappears after the module has cooled down

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

gear shift control module bwiring harness

Related codes

P2DA1P2DA2P273EP085EU0291

References: law.cornell.edu, static.nhtsa.gov.