P0A2C: Drive Motor A Temperature Sensor A Circuit Low

The motor A sensor is an NTC thermistor, so its signal voltage falls as the winding heats; Hyundai's Sonata Hybrid bulletin gives about 11 to 13 kOhm at 20 °C for 2014-15 units. P0A2C means the voltage is too low, which the module reads as an impossibly hot motor: GM sets it on 2013 two-mode trucks above 230 °C (near 0 V), Type B, two trips; the 2011 table uses 184 °C, the 2013 MGU mild hybrid 236 °C. The usual cause is a signal wire shorted to ground or a shorted sensor. P0A2D is the opposite fault, P0A2F a real over-temperature that only counts while the sensor is in range. Hyundai reports a stuck 417 °F reading as a circuit fault. The driver sees a warning and derated electric drive.

Symptoms

• Hybrid system warning or check engine light
• Motor temperature shows a very high fixed value in live data
• Electric drive power reduced or disabled

Most likely causes

• Sensor signal wire shorted to ground
• Thermistor internally shorted (often only with transaxle or motor)
• Chafed extension harness between drive unit and inverter
• Faulty sensor input in the inverter/motor control module

What to check, in order

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

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. With the connector unplugged, check whether the signal wire is making contact with ground.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0A2C means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• A: Hybrid or air and fuel
• 2C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0A2C?

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 P0A2C?

The most common causes are: sensor signal wire shorted to ground; thermistor internally shorted (often only with transaxle or motor); chafed extension harness between drive unit and inverter.

Related codes

• P0A2ADrive Motor A Temperature Sensor A Circuit
• P0A2BDrive Motor A Temperature Sensor A Circuit Range/Performance
• P0A2DDrive Motor A Temperature Sensor A Circuit High
• P0A2FDrive Motor A Over Temperature
• P2DAEDrive Motor A Temperature Sensor B Circuit Low

Sources

• gsi.ext.gm.com: 13OBDG06 Hybrid Diagnostics
• gsi.ext.gm.com: 13OBDG05C Hybrid Diagnostics
• static.nhtsa.gov: SB 10082433 0699

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.