DTC P0201, P0202, P0203, P0204, P0205, or P0206. Chevrolet Silverado

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2008 🢒 Silverado - 4WD 🢒 DTC 🢒 DTC P0201, P0202, P0203, P0204, P0205, or P0206

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 P0201: Injector 1 Control Circuit

DTC P0202: Injector 2 Control Circuit

DTC P0203: Injector 3 Control Circuit

DTC P0204: Injector 4 Control Circuit

DTC P0205: Injector 5 Control Circuit

DTC P0206: Injector 6 Control Circuit

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition 1 Voltage - INJ Fuse 1	P0201, P0203, P0205, P0300	P0201, P0203, P0205, P0300	--	--
Ignition 1 Voltage - INJ Fuse 2	P0202, P0204, P0206, P0300	P0202, P0204, P0206, P0300	--	--
Fuel Injector 1 Control	P0201	P0201	P0201	--
Fuel Injector 2 Control	P0202	P0202	P0202	--
Fuel Injector 3 Control	P0203	P0203	P0203	--
Fuel Injector 4 Control	P0204	P0204	P0204	--
Fuel Injector 5 Control	P0205	P0205	P0205	--
Fuel Injector 6 Control	P0206	P0206	P0206	--

Circuit/System Description

The engine control module (ECM) enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver. If the ECM detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.

Conditions for Running the DTC

•	The engine is running.

•	The ignition voltage is more than 11 volts.

•	DTC P0201-P0206 runs continuously when the above conditions are met.

Conditions for Setting the DTC

•	The ECM detects an incorrect voltage on the fuel injector control circuit.

•	The above condition is met for 1 second.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component 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

Control Module References for scan tool information

Special Tools

J 34730-375 Injector Test Lamp

Circuit/System Testing

Ignition OFF, disconnect the fuel injector harness connector.
Ignition ON, verify that a test lamp illuminates between the affected ignition 1 voltage circuit and ground.

⇒	If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test or replace the fuel injector.

Connect the J 34730-375 between the affected control circuit and the affected ignition 1 voltage circuit.
Command the fuel injector ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

If all circuits test normal, test or replace the fuel injector.

Component Testing

Important: The engine coolant temperature (ECT) sensor must be between 10-32°C (50-90°F) for an accurate measurement.

Measure for 11-14 ohms between the terminals of the fuel injector.

⇒	If the resistance is not within the specified range, replace the fuel injector.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Fuel Injector Replacement

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