P1351 – IDM Input Circuit Malfunction/ Ignition Coil Control Circuit High Voltage

The ODBII code P1351 indicates a malfunction in the IDM (Injector Driver Module) input circuit or a high voltage condition in the ignition coil control circuit, which can affect engine performance and fuel injection timing.

The severity of ODBII code P1351 is generally considered moderate to high.

Common Causes For: P1350 Fuel Level Sensor B Intermittent/Bypass Line Monitor

• Faulty Ignition Coil
• Faulty IDM (Injector Driver Module)
• Wiring issues (shorts or open circuits)
• Poor connections or corroded terminals
• Faulty PCM (Powertrain Control Module)
• Grounding issues
• Faulty sensors (e.g., crankshaft or camshaft position sensors)
• Voltage supply issues

Common misdiagnosis for P1351 IDM Input Circuit Malfunction/ Ignition Coil Control Circuit High Voltage

• Faulty ignition coil
• Bad spark plugs
• Ignition control module failure
• Wiring issues or shorts in the circuit
• Faulty PCM (Powertrain Control Module)
• Fuel system problems
• Vacuum leaks
• Timing issues
• Crankshaft or camshaft position sensor failure
• Battery or charging system issues

Common Troubleshooting Steps

The OBD-II code P1351 indicates an issue with the Ignition Coil Control Circuit, specifically related to the IDM (Ignition Driver Module) input circuit. This code is often associated with problems in the ignition system, which can lead to poor engine performance, misfires, or starting issues. Here are some common troubleshooting steps to diagnose and resolve the P1351 code:

• 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.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the ignition coils and the IDM. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harness for any fraying or breaks.
• Test the Ignition Coils: Use a multimeter to test the resistance of the ignition coils. Compare the readings to the manufacturer’s specifications.
• If any coils are out of spec, they may need to be replaced.
• Check the IDM: Test the Ignition Driver Module (IDM) for proper operation. This may involve checking the power and ground connections to the IDM.
• If the IDM is faulty, it may need to be replaced.
• Inspect the PCM (Powertrain Control Module): Check for any issues with the PCM, as it controls the ignition system. Ensure that it is receiving the correct signals and is functioning properly.
• If necessary, reflash or replace the PCM.
• Test for Short Circuits: Use a multimeter to check for short circuits in the ignition coil circuit. This includes checking for continuity between the ignition coil wires and ground.
• Check for Open Circuits: Ensure that there are no open circuits in the ignition coil control circuit. This can be done by testing the continuity of the wires from the PCM to the ignition coils.
• Inspect the Fuses: Check the fuses related to the ignition system. A blown fuse can cause a loss of power to the ignition coils.
• Perform a Visual Inspection of the Engine: Look for any signs of mechanical issues that could affect the ignition system, such as vacuum leaks or issues with the fuel system.
• Clear the Code and Test Drive: After performing the necessary repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1
• Consult Repair Manual: If the issue persists, consult the vehicle’s repair manual for specific diagnostic procedures and specifications related to the ignition system.1
• Seek Professional Help: If you are unable to resolve the issue, consider seeking help from a professional mechanic or automotive technician who has experience with ignition system diagnostics. By following these steps, you should be able to identify and resolve the underlying issue causing the P1351 code.