P1355: Ignition Coil D Primary Circuit Malfunction

Definition

The OBD2 code P1355 indicates a malfunction in the primary circuit of ignition coil D, which can lead to issues with engine performance, misfires, or starting problems

Common causes

Faulty ignition coil
Damaged wiring or connectors
Poor electrical connections
Failed ignition control module
Faulty engine control unit (ECU)
Short circuit in the primary circuit
Open circuit in the primary circuit
Faulty spark plugs or ignition components

Common misdiagnoses

Faulty ignition coil
Bad spark plugs
Ignition control module failure
Wiring issues or shorts
Engine control unit (ECU) malfunction
Fuel injector problems
Vacuum leaks
Timing belt or chain issues
Crankshaft or camshaft position sensor failure
Battery or charging system problems

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 Ignition Coil
3. Visually inspect the ignition coil for any signs of damage, such as cracks, corrosion, or burnt areas
4. Ensure that the electrical connector is secure and free of corrosion or dirt
5. Test the Ignition Coil
6. Use a multimeter to test the resistance of the ignition coil. Compare the readings to the specifications provided in the vehicle's service manual
7. If the resistance is out of spec, the ignition coil may need to be replaced
8. Check Wiring and Connectors
9. Inspect the wiring harness and connectors leading to the ignition coil for any signs of damage, fraying, or short circuits
10. Repair or replace any damaged wiring or connectors
11. Test the Power and Ground
12. Use a multimeter to check for proper voltage at the ignition coil connector while the ignition is on (but the engine is off)
13. Ensure that the ground connection is solid and that there is no voltage drop
14. Inspect the Engine Control Module (ECM)
15. If the ignition coil and wiring are in good condition, the issue may lie with the ECM. Check for any software updates or known issues with the ECM for your vehicle model
16. In some cases, reprogramming or replacing the ECM may be necessary
17. Check for Vacuum Leaks
18. Inspect the intake manifold and vacuum lines for leaks, as these can affect engine performance and may trigger misfire codes
19. Perform a Compression Test
20. Conduct a compression test on the affected cylinder to ensure that there are no mechanical issues such as a blown head gasket or worn piston rings
21. Clear Codes and Test Drive
22. After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns
23. Consult a Professional
24. If the issue persists after following these steps, it may be best to consult a professional mechanic for further diagnosis. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the P1355 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect the Ignition Coil

3. Visually inspect the ignition coil for any signs of damage, such as cracks, corrosion, or burnt areas

4. Ensure that the electrical connector is secure and free of corrosion or dirt

5. Test the Ignition Coil

6. Use a multimeter to test the resistance of the ignition coil. Compare the readings to the specifications provided in the vehicle's service manual

7. If the resistance is out of spec, the ignition coil may need to be replaced

8. Check Wiring and Connectors

9. Inspect the wiring harness and connectors leading to the ignition coil for any signs of damage, fraying, or short circuits

10. Repair or replace any damaged wiring or connectors

11. Test the Power and Ground

12. Use a multimeter to check for proper voltage at the ignition coil connector while the ignition is on (but the engine is off)

13. Ensure that the ground connection is solid and that there is no voltage drop

14. Inspect the Engine Control Module (ECM)

15. If the ignition coil and wiring are in good condition, the issue may lie with the ECM. Check for any software updates or known issues with the ECM for your vehicle model

16. In some cases, reprogramming or replacing the ECM may be necessary

17. Check for Vacuum Leaks

18. Inspect the intake manifold and vacuum lines for leaks, as these can affect engine performance and may trigger misfire codes

19. Perform a Compression Test

20. Conduct a compression test on the affected cylinder to ensure that there are no mechanical issues such as a blown head gasket or worn piston rings

21. Clear Codes and Test Drive

22. After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

23. Consult a Professional

24. If the issue persists after following these steps, it may be best to consult a professional mechanic for further diagnosis. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the P1355 code