P0D9A: Battery Charger Coupler Temperature Sensor A Circuit Range/Performance

P0D9A covers a coupler temperature signal that is electrically valid but does not make sense, for example a rise that the charging current cannot explain or a value that disagrees with the rest of the system. GM's preliminary information PIT5904 lists it, with P298C and P0E5F, for the 2022 GMC Hummer EV and BrightDrop EV600: the MIL comes on and charging fails or aborts, often at heavily used public or dealer stations. GM suspects software or oversized and damaged terminals in the cable plug, advises clearing codes and trying another station, and notes that the test only re-runs after about 10 minutes of driving above 2 mph. Mercedes stores it as P0D9A97 (sensor malfunction) in the smart's 22 kW charger. Unlike P0D99, a worn station plug can trigger it on a healthy car; true overheating is P0E5F.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

MIL on (GM)
Charging fails or stops, often at busy public stations
Code returns only after a drive of about 10 minutes (GM)

Most likely causes

Oversized or damaged terminals in the charging station plug (GM)
Charging software calibration, update pending or available (GM)
Raised contact resistance at the vehicle inlet pins
Temperature element drifting out of its characteristic

What to check, in order

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

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Compare the reading with other engine data while varying the engine speed.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: medium

What each character of P0D9A means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
9A: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D9A?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0D9A?

The most common causes are: oversized or damaged terminals in the charging station plug (GM); charging software calibration, update pending or available (GM); raised contact resistance at the vehicle inlet pins.

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.