DTC P0352 Ignition signal coil B fault


What is the Circuit like?

  • A ground for the electronic spark timing 3 circuit is enabled by the engine control module (ECM).
  • The magnetic field created by the coil collapses when the ECM removes the ground path of the ignition primary coil.
  •  This dying magnetic field generates a voltage in the secondary coil which shoots the spark plug.
  •  A close monitoring is done to the circuit between the ECM and the electronic ignition system for an open circuit, short to voltage, and low voltage.
  •  DTC PO352 is introduced the moment the ECM sniffs a problem in the spark timing 3 circuit.
  • What leads to the setting of  DTC?

·   This DTC can be stored in "key-on" status.

·   Time of fault fall occurrence is > time of the DIS fall occurrence.

·   Must receive more than 40 failures within 80 test cycles.

What happens when DTC sets?

When will DTC clear?

1) The Malfunction Indicator Lamp (MIL) will illuminate

1) The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault.


2) The ECM will record operating conditions at the time the diagnostic fails which will be stored in the Freeze Frame and failure records will buffer.


2) A history DTC will clear after 40 repetitive warm up cycles without a fault.


3) A history DTC is stored.


3) Using the scan tool can clear DTC(s).


4) The ECM will default to 6 degree timing.


4) Disconnecting the ECM battery feed for 10 seconds


Diagnostic Tools

Check and correct any unusual engine noise before implementing the diagnostic table.


Any circuitry that is suspected to initiate engine noise complaint should be thoroughly checked for the following conditions:

·   Backed-out terminals.

·   Improper mating.

·   Broken locks.

·   Improperly formed.

·   Damaged terminals.

·   Poor terminal-to-wire connections.

·   Physical damage to the wiring harness.

DTC P0352 - Ignition Signal Coil B Fault



Task Done? (Yes)

Task Done? (No)


Perform EOBD System Check.


Go to Step 2

Go to "On-Board Diagnostic System Check"


Look for an erroneous connection or a damaged terminal 3 at the ignition coil.


Go to Step 8

Go to Step 3


  1. Turn the ignition switch to LOCK.
  2. Disconnect the ECM.
  3. Check the ignition control circuit for a short to ground


Go to Step 8

Go to Step 5


Inspect the ignition control circuit for a short to battery voltage.


Go to Step 8

Go to Step 6


See whether there is any open in the ignition control.


Go to Step 8

Go to Step 7


Replace the ECM.


Go to Step 8



  1. Clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and Idle at normal operating temperature.
  3. Run  the vehicle within the conditions for setting this DTC as specified in the supporting text.

Does the scan tool indicate that this diagnostic has been run and passed the test?

Go to Step 9



Check if any additional DTCs are set.


Are any DTCs visible that have not been diagnosed?

Go to Applicable DTC table

The System of your vehicle is OK