What Does P0A43 Mean?
DTC P0A43 indicates that the drive motor "A" position sensor circuit is experiencing intermittent signal disruptions. The Hybrid Control Module has detected momentary dropouts, spikes, or glitches in the position sensor data that appear and resolve without the signal failing completely. Intermittent position sensor faults are particularly concerning because even brief position data loss or corruption during motor operation can cause commutation errors, resulting in torque disturbances that the driver may feel as jerks or hesitation. The HCM may log this code over multiple drive cycles before taking protective action.
Common Causes
35%
Loose or corroded connector pins at the motor position sensor causing intermittent contact
25%
Vibration-induced wire fatigue creating intermittent open circuits in the harness
15%
Degrading resolver with intermittent winding continuity
15%
Intermittent shield grounding allowing periodic noise ingress
10%
Motor bearing developing play that intermittently changes the resolver air gap
Diagnostic Steps
1
Step 1: Review freeze frame data to identify the conditions under which the intermittent fault occurs. Note motor speed, torque, temperature, and vibration levels.
2
Step 2: Perform an extended wiggle test on the position sensor connector and wiring while monitoring live sensor data. Apply gentle pressure to connectors and flex the harness to reproduce the intermittent.
3
Step 3: Inspect all connector terminals for corrosion, reduced pin tension, or evidence of intermittent contact such as arcing marks or discoloration.
4
Step 4: Check the resolver wiring harness for any chafing, sharp bends, or areas where the harness passes through grommets or clips that could cause wire fatigue.
5
Step 5: Check motor bearings for developing play that could cause intermittent resolver air gap changes during operation. This may require removing the motor for inspection.
6
Step 6: If the intermittent cannot be reproduced statically, install a data logger to capture resolver signal quality during driving to identify the failure mode.
Estimated Repair Cost
$250 - $2,000
Parts + labor, varies by vehicle and location
DTC P0A43 indicates that the drive motor "A" position sensor circuit is experiencing intermittent signal disruptions. The Hybrid Control Module has detected momentary dropouts, spikes, or glitches in the position sensor data that appear and resolve without the signal failing completely. Intermittent...
The most common cause of P0A43 (Drive Motor "A" Position Sensor Circuit Intermittent) is: Loose or corroded connector pins at the motor position sensor causing intermittent contact
Typical repair costs for P0A43 range from $250 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent position sensor faults can cause momentary torque disturbances during driving, which the driver may experience as jerking or hesitation. If the fault becomes more frequent, the HCM may disable motor operation entirely during a drive cycle.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A43 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drivetrain
Difficulty
Type
Generic (SAE)
Recommended Tools
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