P0A2A: Drive Motor A Temperature Sensor Circuit
Electrical fault on the temperature sensor inside drive motor A windings. The sensor is used to derate motor torque when winding temperature approaches the insulation limit.
What P0A2A means
P0A2A is a generic OBD-II powertrain code in the hybrid & EV group. In plain English: the computer found an electrical fault in that circuit: an open, short or bad connection, or a failed component.
- Check engine light
- Usually on
- Emissions-related
- No
- Limp mode possible
- Not typical
- Drive cycle to clear
- Not required
Get it fixed
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Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Common causes
- 01Sensor failedMost likely
- 02Wiring faultPossible
Can I drive with P0A2A?
Usually yes, for a short time.
The car will often drive normally, but get it diagnosed soon. If you notice rough running, warning lights flashing, overheating or a burning smell, stop driving.
Why we rate it moderate
- Turns on the check engine light
Severity is our rule-based rating from the code’s flags in OBDex and the system it affects, not an inspection of your car. If the check engine light is flashing, or you notice overheating, low oil pressure, or brake or steering problems, stop driving and get help.
How to diagnose P0A2A
- 1
Confirm the code and save freeze-frame data
Read the codes with an OBD-II scan tool and note every code, not just P0A2A. Save the freeze-frame data (speed, load, temperature when the fault set) before clearing anything; it tells you when the fault happens.
- 2
Check for related codes first
Look for P0A30. Related codes often share a cause; a circuit or sensor code usually needs fixing before a performance code like this one.
- 3
Test the circuit
Inspect the wiring and connector at the drive motor a and motor temperature sensor for damage, corrosion or chafing. With a multimeter, check supply voltage, ground and signal against the specifications in the service manual for your vehicle.
- 4
Test the likely causes in order
Start with the most likely cause and work down: Sensor failed; wiring fault. Test before replacing parts.
- 5
Check for recalls and service bulletins
Look up recalls for your exact vehicle with its VIN, and ask a dealer about technical service bulletins (TSBs). Manufacturers sometimes issue software updates or extended warranties for known faults.
- 6
Clear the code and verify the repair
After the repair, clear the code and drive the car under the conditions in the freeze-frame data to confirm it does not return.
P0A2A repair cost estimate
Estimate, not a quote. Labor times are typical ranges for this code from OBDex, and $125/hr is an assumed rate. Shop rates and labor times vary by vehicle and region. Diagnosis time may be billed separately.
- DIY difficulty
- Shop only
- Good DIY job?
- Usually a shop job
Needs dealer-level tools or high-voltage training.
Parts and systems involved
- Drive motor A
- Motor temperature sensor
- Wiring harness
P0A2A FAQ
What does P0A2A mean?
P0A2A means “Drive Motor A Temperature Sensor Circuit”. Electrical fault on the temperature sensor inside drive motor A windings. The sensor is used to derate motor torque when winding temperature approaches the insulation limit.
Is P0A2A serious? Can I keep driving?
We rate P0A2A as moderate severity. Usually yes, for a short time. The car will often drive normally, but get it diagnosed soon. If you notice rough running, warning lights flashing, overheating or a burning smell, stop driving.
What causes P0A2A?
The most common causes, from most to least likely: Sensor failed; Wiring fault. Test before replacing parts, because several causes can set the same code.
How much does it cost to fix P0A2A?
Typical labor is about $250–$1,250 at an assumed $125/hour shop rate, plus parts. That is an estimate, not a quote: labor times and rates vary by vehicle and region, and diagnosis may be billed separately.
Can I fix P0A2A myself?
DIY difficulty is shop only. Most owners leave this to a shop because it needs involved testing or specialist tools. Always confirm the cause before buying parts.
Will P0A2A clear itself?
If the fault was intermittent, the warning may go off once the computer stops seeing it, but the code stays in memory. Fix the cause; clearing the code alone doesn’t repair anything.