P1914: Manually Shifted Automatic (MSA) Sw Circuit Malf

Definition

The OBD2 code P1914 indicates a malfunction in the Manually Shifted Automatic (MSA) switch circuit, which affects the transmission's ability to shift properly when manually controlled

Common causes

Faulty transmission control module (TCM)
Damaged wiring or connectors in the shift circuit
Malfunctioning manual shift switch
Short circuit or open circuit in the shift circuit
Faulty transmission range sensor
Software issues in the TCM
Poor ground connection in the circuit

Common misdiagnoses

Transmission Control Module (TCM) failure
Faulty shift solenoid
Wiring issues or shorts in the circuit
Malfunctioning transmission range sensor
Incorrectly adjusted or damaged gear shift linkage
Faulty brake switch
Issues with the vehicle's battery or charging system
Engine control module (ECM) problems
Low transmission fluid levels or contamination
Faulty or worn-out transmission components

Troubleshooting steps

1. Check for Additional Codes

Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues
2. Inspect the MSA Switch
3. Locate the MSA switch in your vehicle. This is often found on the gear shifter or near the transmission
4. Check for any visible damage, corrosion, or loose connections at the switch
5. Test the MSA Switch
6. Use a multimeter to test the continuity of the MSA switch. Ensure that it operates correctly when shifted between positions
7. If the switch is faulty, it may need to be replaced
8. Check Wiring and Connectors
9. Inspect the wiring harness and connectors leading to the MSA switch for any signs of damage, fraying, or corrosion
10. Repair or replace any damaged wiring or connectors
11. Inspect the Transmission Control Module (TCM)
12. The TCM may be receiving incorrect signals from the MSA switch. Check for any software updates or known issues with the TCM for your specific vehicle model
13. If necessary, test the TCM for proper operation
14. Check for Ground Issues
15. Ensure that the ground connections related to the MSA switch and TCM are secure and free of corrosion. Poor grounding can lead to erratic behavior
16. Clear Codes and Test Drive
17. After performing any repairs or replacements, clear the trouble codes using the OBD-II scanner
18. Take the vehicle for a test drive to see if the code reappears
19. Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the MSA switch and transmission system
20. Seek Professional Help
21. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who specializes in transmission systems. By following these troubleshooting steps, you should be able to identify and resolve the issue associated with the P1914 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect the MSA Switch

3. Locate the MSA switch in your vehicle. This is often found on the gear shifter or near the transmission

4. Check for any visible damage, corrosion, or loose connections at the switch

5. Test the MSA Switch

6. Use a multimeter to test the continuity of the MSA switch. Ensure that it operates correctly when shifted between positions

7. If the switch is faulty, it may need to be replaced

8. Check Wiring and Connectors

9. Inspect the wiring harness and connectors leading to the MSA switch for any signs of damage, fraying, or corrosion

10. Repair or replace any damaged wiring or connectors

11. Inspect the Transmission Control Module (TCM)

12. The TCM may be receiving incorrect signals from the MSA switch. Check for any software updates or known issues with the TCM for your specific vehicle model

13. If necessary, test the TCM for proper operation

14. Check for Ground Issues

15. Ensure that the ground connections related to the MSA switch and TCM are secure and free of corrosion. Poor grounding can lead to erratic behavior

16. Clear Codes and Test Drive

17. After performing any repairs or replacements, clear the trouble codes using the OBD-II scanner

18. Take the vehicle for a test drive to see if the code reappears

19. Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the MSA switch and transmission system

20. Seek Professional Help

21. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who specializes in transmission systems. By following these troubleshooting steps, you should be able to identify and resolve the issue associated with the P1914 code