P2307: Ignition Coil "C" Primary Control Circuit High

Definition

The OBD2 code P2307 indicates that there is a high voltage or an open circuit in the primary control circuit of ignition coil "C," which can lead to improper ignition coil operation

Common causes

Faulty ignition coil "C"
Open or shorted wiring in the ignition coil circuit
Poor electrical connections or corroded terminals
Faulty engine control module (ECM)
Failed ignition coil driver in the ECM
High resistance in the ignition coil circuit
Faulty spark plug or spark plug wire associated with coil "C"

Common misdiagnoses

Faulty ignition coil
Bad spark plugs
Wiring issues or shorts
Faulty engine control module (ECM)
Fuel injector problems
Vacuum leaks
Faulty crankshaft or camshaft position sensors
Bad connectors or terminals
Incorrectly installed ignition components
Battery or charging system issues

Troubleshooting steps

1. Check the Code

Use an OBD-II scanner to confirm that P2307 is the only code present. If there are other codes, they may provide additional context for the problem
2. Visual Inspection
3. Inspect the wiring and connectors associated with ignition coil "C" for any signs of damage, corrosion, or loose connections
4. Look for any frayed wires or broken insulation that could cause a short circuit or high resistance
5. Test the Ignition Coil
6. Remove the ignition coil "C" and test it with a multimeter. Check the primary and secondary resistance according to the specifications in the vehicle's service manual
7. If the coil is out of specification, replace it
8. Check the Power and Ground
9. Verify that the ignition coil is receiving the correct voltage. Use a multimeter to check for battery voltage at the coil connector with the ignition on
10. Check the ground connection for the ignition coil. A poor ground can cause high resistance and trigger the code
11. Inspect the Ignition Control Module (ICM)
12. If applicable, check the ignition control module for proper operation. The ICM controls the ignition coils, and a malfunctioning module can lead to high voltage readings
13. Check for Short Circuits
14. Inspect the wiring harness for any shorts to power or ground that could cause the circuit to read high voltage
15. Use a multimeter to check for continuity and resistance in the wiring
16. Scan for Additional Codes
17. If the problem persists, scan for additional trouble codes that may indicate related issues, such as problems with other ignition coils or the engine control module (ECM)
18. Check the Engine Control Module (ECM)
19. If all other components check out, the issue may lie with the ECM itself. Ensure that the ECM is functioning correctly and is not sending incorrect signals to the ignition coil
20. Clear the Codes and Test Drive
21. After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns
22. Consult a Professional
23. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P2307 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Code

2. Visual Inspection

3. Inspect the wiring and connectors associated with ignition coil "C" for any signs of damage, corrosion, or loose connections

4. Look for any frayed wires or broken insulation that could cause a short circuit or high resistance

5. Test the Ignition Coil

6. Remove the ignition coil "C" and test it with a multimeter. Check the primary and secondary resistance according to the specifications in the vehicle's service manual

7. If the coil is out of specification, replace it

8. Check the Power and Ground

9. Verify that the ignition coil is receiving the correct voltage. Use a multimeter to check for battery voltage at the coil connector with the ignition on

10. Check the ground connection for the ignition coil. A poor ground can cause high resistance and trigger the code

11. Inspect the Ignition Control Module (ICM)

12. If applicable, check the ignition control module for proper operation. The ICM controls the ignition coils, and a malfunctioning module can lead to high voltage readings

13. Check for Short Circuits

14. Inspect the wiring harness for any shorts to power or ground that could cause the circuit to read high voltage

15. Use a multimeter to check for continuity and resistance in the wiring

16. Scan for Additional Codes

17. If the problem persists, scan for additional trouble codes that may indicate related issues, such as problems with other ignition coils or the engine control module (ECM)

18. Check the Engine Control Module (ECM)

19. If all other components check out, the issue may lie with the ECM itself. Ensure that the ECM is functioning correctly and is not sending incorrect signals to the ignition coil

20. Clear the Codes and Test Drive

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

22. Consult a Professional

23. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the P2307 code