Drive Motor Temperature Sensor Circuit High
The P0A33 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the drive motor temperature sensor that is higher than the expected range. This sensor monitors the temperature of the electric drive motor in hybrid/electric vehicles. A high voltage typically corresponds to a very high temperature reading or a short circuit to voltage. This can lead to reduced motor performance or safety shutdown to prevent damage.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or limp mode
- Overheating warning on dashboard
- Poor fuel economy (in hybrid mode)
- Vehicle may not start or move
2. Most Common Causes
- Faulty drive motor temperature sensor
- Short circuit to voltage in sensor wiring
- Open circuit in sensor ground or signal wire
- Corroded or damaged connector
- ECM software or hardware issue
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the drive motor temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor resistance and compare to manufacturer specifications; typically high resistance indicates a fault.
Step 4: Check for short to voltage or ground in the sensor circuit using a multimeter.
Step 5: If wiring and sensor are okay, test the ECM output and consider reprogramming or replacement.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, reducing power, and continued driving could cause motor damage due to overheating.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts (sensor $50-$150) and labor ($100-$250).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.