What Does P0C59 Mean?
This code indicates the powertrain controller has detected intermittent signal dropouts, erratic voltage spikes, or inconsistent readings from drive motor "B" position sensor circuit "A." The signal is not continuously out of range but exhibits sporadic deviations that compromise reliable rotor position tracking. This can cause momentary torque disturbances, vibration, or brief power interruptions during driving.
Common Causes
30%
Loose or partially backed-out connector pin causing intermittent contact
25%
Chafed or damaged wire insulation creating occasional shorts
20%
Intermittent sensor failure due to thermal cycling or internal crack
15%
Electromagnetic interference from adjacent high-voltage cables or inverter switching noise
10%
Corroded connector terminal with temperature-dependent resistance
Diagnostic Steps
1
Monitor the position sensor signal in real-time using an oscilloscope while test-driving to capture the intermittent fault.
2
Perform a thorough wiggle test on the sensor connector and harness while monitoring live data for signal dropouts.
3
Inspect the harness routing for points where the sensor wires run close to high-voltage cables or inverter components—look for chafing or inadequate shielding.
4
Check connector terminals for corrosion or looseness; measure terminal tension with a pin tension gauge.
5
If the fault correlates with temperature, use a heat gun and freeze spray on the sensor to isolate a thermally intermittent component.
Estimated Repair Cost
$250 - $1,600
Parts + labor, varies by vehicle and location
This code indicates the powertrain controller has detected intermittent signal dropouts, erratic voltage spikes, or inconsistent readings from drive motor "B" position sensor circuit "A." The signal is not continuously out of range but exhibits sporadic deviations that compromise reliable rotor posi...
The most common cause of P0C59 (Drive Motor "B" Position Sensor Circuit "A" Intermittent/Erratic) is: Loose or partially backed-out connector pin causing intermittent contact
Typical repair costs for P0C59 range from $250 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent position sensor faults can cause brief, unpredictable torque disturbances. While the vehicle may operate normally most of the time, sudden signal loss at high speed could result in momentary power interruption. Diagnose promptly to prevent escalation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C59 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor System
Difficulty
Type
Generic (SAE)
Recommended Tools
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