Engine-Codes - Cadillac - P0A40 CADILLAC

P0A40 CADILLAC Code - Drive Motor 1 Position Sensor Performance

- Code Popularity: 708 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0A40 CADILLAC Code?

  • Faulty Drive Motor 1 Position Sensor
  • Drive Motor 1 Position Sensor harness is open or shorted
  • Drive Motor 1 Position Sensor circuit poor electrical connection
  • Faulty Power Inverter Module

|How to Fix the P0A40 CADILLAC Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0A40 CADILLAC code?

Labor: 1.0

The cost to diagnose the P0A40 CADILLAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0A40 CADILLAC code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0A40 CADILLAC Code Mean?

The drive motor position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed, and direction of the drive motor rotor based upon the signals of the resolver-type position sensor. The position sensor contains a drive coil, two driven coils, and an irregular-shaped metallic rotor. The metallic rotor is mechanically attached to the shaft of the drive motor. At vehicle ON, the motor control module outputs a 7 V AC, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular-shaped rotor. The motor control module then monitors the two driven coil circuits for return signals, often referred to as Sine and Cosine waveforms, abbreviated SIN and COS. The position of the irregular metallic rotor causes the magnetically induced return signals of the driven coils to vary in size and shape. A comparison of the two driven coil signals allows the motor control module to determine the exact position, speed, and direction of the drive motor rotor. The drive motor 1 position sensor is serviceable separately from the drive motor assembly. The Diagnostic Trouble Code (DTC) will be set when the motor control module detects a degraded motor position sensor signal.

Drive Motor 1 Position Sensor Performance

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