DTC P0351-P0354. Chevrolet Cobalt 2007

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2007 🢒 Cobalt 🢒 Engine 🢒 Engine Controls and Fuel - 2.0L 🢒 DTC P0351-P0354

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0351: Ignition Coil 1 Control Circuit

DTC P0352: Ignition Coil 2 Control Circuit

DTC P0353: Ignition Coil 3 Control Circuit

DTC P0354: Ignition Coil 4 Control Circuit

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Ignition Coil 1 Control Circuit	P0351	P0351	P0351	P0351	P0351
Ignition Coil 2 Control Circuit	P0352	P0352	P0352	P0352	P0352
Ignition Coil 3 Control Circuit	P0353	P0353	P0353	P0353	P0353
Ignition Coil 4 Control Circuit	P0354	P0354	P0354	P0354	P0354

The ignition system uses individual ignition coil/module assemblies for each cylinder. The powertrain control module (PCM) controls the individual coils by transmitting timing pulses on the ignition control (IC) circuit of each ignition coil/module to enable a spark event. The PCM monitors each IC circuit for improper voltage levels. Each ignition coil/module has the following circuits:

•	An ignition voltage circuit

•

A ground

•	An IC control circuit

•	A low reference circuit

Conditions for Running the DTC

•	The engine is running.

•	DTCs P0351-P0354 runs continuously when the above condition is met.

Conditions for Setting the DTC

•	The PCM detects an open on the circuit or the ignition coil/module for less than 1 second.

•	The PCM detects a short to ground on the circuit or the ignition coil/module for less than 1 second.

•	The PCM detects a short to voltage on the circuit or the ignition coil/module for less than 1 second.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

•	Engine Controls Connector End Views

•	Powertrain Control Module Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

•	Scan Tool Data List

•	Scan Tool Output Controls

Circuit/System Verification

•	Start and idle the engine.

•	Observe the scan tool DTC Information and the Misfire Current Cylinder parameters. This will indicate the affected ignition coil/modules, and if the condition is current.

Circuit/System Testing

Turn OFF the ignition.
Disconnect the PCM.

Important: A high resistance on any IC circuit can cause a misfire before the DTC sets.

Test the affected IC circuit for an open, a high resistance, a short to ground and for a short to voltage.

⇒	If a fault is found, repair the circuit as needed.

Connect the PCM.
Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
Start the engine and observe the scan tool.

⇒	If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed.

⇒	If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the PCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Ignition Coil Replacement

•	Control Module References for PCM replacement, setup, and programming