Powertrain, generic (extended)

P273C Gear Shift Control Module A Supply Voltage Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Gear shift control module A is the electronic selector used where the gearbox is shifted by wire – lever, rotary knob or push buttons – which turns the driver's choice into a message for the transmission control module. P273C means the supply voltage that this module sees, or reports, has fallen below its lower limit. No manufacturer documents P273C or its threshold publicly. A weak supply matters because a selector that resets or browns out can no longer confirm P, R, N or D; the gearbox then keeps its range or refuses to leave Park. Stellantis shows how sensitive these modules are: for a rotary selector stuck in Park, its 2022 case advised pulling and refitting fuse F94 to restart the module. Check battery, fuse, feed and ground first.

Likely causes

Weak or discharged 12 V battery, voltage dips at start
Corroded fuse contact, feed wire or ground of the selector module
Alternator or DC/DC converter not supplying enough voltage
Internal fault in the gear shift module

Symptoms

  • Selector warning, range cannot be changed
  • Vehicle will not shift out of Park
  • Gear indicator flickers or goes blank

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–800
Time0.5–3 h

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

Parts involved

gear shift module acharging systembattery

Related codes

P273DP273EP2DA1P0860U0103

References: en.wikipedia.org, static.nhtsa.gov, law.cornell.edu.