Powertrain, generic (extended)

P273D Gear Shift Control Module A Supply Voltage High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P273D is the over-voltage counterpart of P273C: the gear shift control module A, the electronic selector of a by-wire gear selection, registers a supply above its permitted maximum. No manufacturer documents P273D publicly or names the limit. Excess voltage typically comes from the charging side – a regulator that has failed, jump-starting with a 24 V source or a booster left on – and may also be misread if the module's own measurement drifts. Audi gives an example of the latter on 2019–21 A6/A7 models: the selector lever J587 judged its voltage too strictly, logged faults and blocked range selection until a software update. Modules usually protect themselves by ignoring inputs, so expect a selector warning and a gearbox that holds its current range.

Likely causes

Alternator voltage regulator overcharging
Jump-start or charger delivering excessive voltage
Selector module misjudging its supply (software or hardware)

Symptoms

  • Selector or gearbox warning in the cluster
  • Range selection blocked
  • Other over-voltage faults in several modules

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

gear shift module acharging system

Related codes

P273CP273EP2DA2P0860U0103

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