Powertrain
Definition only
Lights the check engine lamp
P273D: Gear Shift Control Module A Supply Voltage High
Standardized SAE J2012 code · P27xx — Transmission
What does P273D mean?
The gear shift control module A reports a supply voltage above the operating range.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
- High Alternator regulator failed to limit output
- Low Load dump transient after disconnecting a heavy load
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P273D on the same make and model first.
P273D in the community
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