P035A: Ignition Coil 'A' Primary/Secondary Circuit Range/Performance Problem

Definition

The OBD2 code P035A indicates a performance issue with the ignition coil 'A', specifically related to the primary and secondary circuit range, suggesting that the coil is not functioning within the expected parameters

Common causes

Faulty ignition coil
Damaged wiring or connectors
Faulty engine control module (ECM)
Poor ground connection
Short circuit in the ignition coil circuit
Open circuit in the ignition coil circuit
Faulty spark plugs
Engine misfire
Corroded terminals or connectors

Common misdiagnoses

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

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 coil is securely mounted and that all connections are tight
5. Check Wiring and Connectors
6. Inspect the wiring harness and connectors leading to the ignition coil for any signs of wear, fraying, or damage
7. Look for loose or corroded connections that could affect the circuit's performance
8. Test the Ignition Coil
9. Use a multimeter to test the resistance of the ignition coil. Compare the readings to the specifications provided in the vehicle's service manual
10. If the resistance is outside the specified range, the ignition coil may need to be replaced
11. Check the Power and Ground Supply
12. Verify that the ignition coil is receiving the correct voltage and ground signal. Use a multimeter to check for power at the coil connector while the ignition is on
13. If there is no power, trace the wiring back to the ignition control module or power source to identify any issues
14. Inspect the Ignition Control Module (ICM)
15. If the ignition coil and wiring are in good condition, the issue may lie with the ignition control module. Test the ICM according to the manufacturer's specifications
16. If the ICM is faulty, it may need to be replaced
17. Check for Engine Ground Issues
18. Ensure that the engine has a good ground connection. Poor grounding can lead to erratic performance and trigger codes like P035A
19. Look for Vacuum Leaks
20. Vacuum leaks can affect engine performance and may contribute to ignition issues. Inspect hoses and intake components for leaks
21. Perform a Visual Inspection of Related Components
22. Check other components related to the ignition system, such as spark plugs and wires, for wear or damage
23. Clear the Codes and Test Drive
24. After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. 1
25. Consult a Professional
26. If the issue persists after following these steps, it may be best to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P035A 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 coil is securely mounted and that all connections are tight

5. Check Wiring and Connectors

6. Inspect the wiring harness and connectors leading to the ignition coil for any signs of wear, fraying, or damage

7. Look for loose or corroded connections that could affect the circuit's performance

8. Test the Ignition Coil

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

10. If the resistance is outside the specified range, the ignition coil may need to be replaced

11. Check the Power and Ground Supply

12. Verify that the ignition coil is receiving the correct voltage and ground signal. Use a multimeter to check for power at the coil connector while the ignition is on

13. If there is no power, trace the wiring back to the ignition control module or power source to identify any issues

14. Inspect the Ignition Control Module (ICM)

15. If the ignition coil and wiring are in good condition, the issue may lie with the ignition control module. Test the ICM according to the manufacturer's specifications

16. If the ICM is faulty, it may need to be replaced

17. Check for Engine Ground Issues

18. Ensure that the engine has a good ground connection. Poor grounding can lead to erratic performance and trigger codes like P035A

19. Look for Vacuum Leaks

20. Vacuum leaks can affect engine performance and may contribute to ignition issues. Inspect hoses and intake components for leaks

21. Perform a Visual Inspection of Related Components

22. Check other components related to the ignition system, such as spark plugs and wires, for wear or damage

23. Clear the Codes and Test Drive

24. After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. 1

25. Consult a Professional

26. If the issue persists after following these steps, it may be best to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P035A code