P273C: Gear Shift Control Module A Supply Voltage Low

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.

Medium severity. Can I keep driving?It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

Check the battery and grounds
With the connector unplugged, check whether the signal wire is making contact with ground.
Clear the code and see if it returns
If it is a reference voltage code, disconnect sensors one at a time and see if the voltage recovers
Check whether a software update is available
Do not replace the control module without a full diagnosis

Good to know

Repair difficulty: medium
It can trigger limp mode.

What each character of P273C means

P: Powertrain: engine and transmission
2: Generic code: same on every make
7: Transmission
3C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P273C?

It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

What causes code P273C?

The most common causes are: 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.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.