P0A40 2016 Chevrolet Silverado Code - Drive Motor Position Sensor Performance
Quick Answer
The generator control module also called the starter/generator control module, is comprised of the following three control modules: the hybrid/EV powertrain control module 1, 14 V power module, and the drive motor control module. Common causes include Faulty Starter/Generator, Starter/Generator harness is open or shorted, Starter/Generator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0A40 2016 Chevrolet Silverado indicates Drive Motor Position Sensor Performance.
- Common causes
- Common causes include Faulty Starter/Generator, Starter/Generator harness is open or shorted, Starter/Generator circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0A40 2016 Chevrolet Silverado Description
The generator control module monitors the angular position, speed, and direction of the starter generator rotor based upon the signals of the resolver-type motor 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 starter generator.
At ignition ON, an AC voltage, 10 kHz excitation signal is output to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregular-shaped rotor. The generator control module then monitors the two driven coil circuits for a return signal. 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 coils signals allows the generator control module to determine the exact position, speed, and direction of the starter generator rotor. The position sensor is a non-serviceable part of the starter generator.
The Diagnostic Trouble Code (DTC) will be set when the Sin or Cos signal is greater than 4 V or Sin or Cos amplitude mismatch is greater than 0.385V.
What are the Possible Causes of the DTC P0A40 2016 Chevrolet Silverado?
- Faulty Starter/Generator
- Starter/Generator harness is open or shorted
- Starter/Generator circuit poor electrical connection
- Faulty Starter/Generator Control Module
How to Fix the DTC P0A40 2016 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0A40 2016 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0A40 2016 Chevrolet Silverado Code
1. What does the OBDII code P0A40 mean for a 2016 Chevrolet Silverado?
The code P0A40 indicates a "Drive Motor Position Sensor Performance" issue, meaning the vehicle's powertrain control module has detected a performance problem with the motor position sensor.
2. What are the common symptoms of the P0A40 code in a 2016 Chevrolet Silverado?
Symptoms may include reduced power, warning lights such as the check engine light or hybrid system warning, poor acceleration, or the vehicle entering limp mode.
3. What causes the P0A40 code in a 2016 Chevrolet Silverado?
Common causes include a faulty drive motor position sensor, wiring issues, corroded or loose electrical connections, or a malfunctioning hybrid/drive motor control module.
4. How is the P0A40 code diagnosed?
A technician will use a scan tool to verify the code, inspect the motor position sensor and wiring, check for loose or corroded connections, and test the sensor’s performance against manufacturer specifications.
5. Can I drive my 2016 Chevrolet Silverado with the P0A40 code?
Driving with this code is not recommended, as it can lead to reduced performance, potential damage to the hybrid system, or unsafe driving conditions.
6. How do you fix the P0A40 code on a 2016 Chevrolet Silverado?
Repairs may include replacing the drive motor position sensor, repairing damaged wiring or connectors, or reprogramming or replacing the hybrid control module if necessary.
7. How much does it cost to repair the P0A40 code on a 2016 Chevrolet Silverado?
Repair costs can vary but typically range from $200 to $800, depending on whether the sensor, wiring, or control module needs replacement.
8. Can a faulty drive motor position sensor trigger other codes in a 2016 Chevrolet Silverado?
Yes, a faulty sensor can trigger related codes, such as those for hybrid system performance or other motor-related issues.
9. How can I prevent the P0A40 code from occurring in my 2016 Chevrolet Silverado?
Regular maintenance, inspecting electrical connections for corrosion, and ensuring the hybrid system is serviced as recommended can help prevent this issue.
10. Does the P0A40 code only affect hybrid 2016 Chevrolet Silverado models?
Yes, this code is specific to hybrid or electric drivetrain components, so it typically applies only to Silverado models equipped with hybrid systems.
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