P2143: Fuel Injector Group A Supply Voltage Circuit High

Definition

The OBD2 code P2143 indicates that there is a high voltage detected in the fuel injector group A supply voltage circuit, which may affect the operation of the fuel injectors in that group

Common causes

Faulty fuel injector driver module
Short circuit in the wiring harness
Open circuit in the wiring harness
Faulty fuel injectors
Poor ground connection
Malfunctioning engine control module (ECM)
Corroded or damaged connectors
Voltage supply issues from the battery or alternator

Common misdiagnoses

Faulty fuel injectors
Bad engine control module (ECM)
Wiring issues or shorts
Fuel pump problems
Faulty fuel injector driver circuit
Poor ground connections
Corroded connectors
Battery or charging system issues
Ignition system faults
Vacuum leaks

Troubleshooting steps

1. Check for Additional Codes

Before proceeding, check for any other related trouble codes that may provide more context to the issue
2. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors associated with the fuel injectors in group A. Look for signs of damage, corrosion, or loose connections
4. Pay special attention to the wiring harness for any fraying or short circuits
5. Test the Fuel Injector Circuit
6. Use a multimeter to measure the voltage at the fuel injector connector. Ensure that the voltage is within the manufacturer's specified range
7. Check for any short circuits to ground or to power that could cause the voltage to be too high
8. Check the Power Supply
9. Verify that the power supply to the fuel injector circuit is functioning correctly. This may involve checking the fuel injector relay and associated fuses
10. If the relay is faulty, it may be providing an incorrect voltage to the injectors
11. Inspect the Engine Control Module (ECM)
12. The ECM controls the fuel injectors, so ensure that it is functioning properly. Check for any signs of damage or corrosion on the ECM connectors
13. If necessary, perform a software update or reprogramming of the ECM
14. Test the Fuel Injectors
15. If the wiring and connectors are in good condition, test the fuel injectors themselves. They may be stuck open or malfunctioning, causing an excessive voltage reading
16. Use a noid light or an oscilloscope to check the injector pulse width and operation
17. Check for Ground Issues
18. Ensure that the ground connections for the fuel injectors are secure and free of corrosion. A poor ground can lead to erratic voltage readings
19. Inspect for Other Electrical Issues
20. Look for any other electrical issues in the vehicle that could be affecting the fuel injector circuit, such as a failing battery or alternator
21. Consult Technical Service Bulletins (TSBs)
22. Check for any TSBs related to the P2143 code for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations
23. Clear the Code and Test Drive
24. After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns. If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect Wiring and Connectors

3. Visually inspect the wiring and connectors associated with the fuel injectors in group A. Look for signs of damage, corrosion, or loose connections

4. Pay special attention to the wiring harness for any fraying or short circuits

5. Test the Fuel Injector Circuit

6. Use a multimeter to measure the voltage at the fuel injector connector. Ensure that the voltage is within the manufacturer's specified range

7. Check for any short circuits to ground or to power that could cause the voltage to be too high

8. Check the Power Supply

9. Verify that the power supply to the fuel injector circuit is functioning correctly. This may involve checking the fuel injector relay and associated fuses

10. If the relay is faulty, it may be providing an incorrect voltage to the injectors

11. Inspect the Engine Control Module (ECM)

12. The ECM controls the fuel injectors, so ensure that it is functioning properly. Check for any signs of damage or corrosion on the ECM connectors

13. If necessary, perform a software update or reprogramming of the ECM

14. Test the Fuel Injectors

15. If the wiring and connectors are in good condition, test the fuel injectors themselves. They may be stuck open or malfunctioning, causing an excessive voltage reading

16. Use a noid light or an oscilloscope to check the injector pulse width and operation

17. Check for Ground Issues

18. Ensure that the ground connections for the fuel injectors are secure and free of corrosion. A poor ground can lead to erratic voltage readings

19. Inspect for Other Electrical Issues

20. Look for any other electrical issues in the vehicle that could be affecting the fuel injector circuit, such as a failing battery or alternator

21. Consult Technical Service Bulletins (TSBs)

22. Check for any TSBs related to the P2143 code for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations

23. Clear the Code and Test Drive

24. After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns. If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis