Submit the correct Bulletin Only Labor Operation for this repair: 4080628*.

Proactive Alert Engine Controls & Fuel Service Message Identifier ECF003
1.

Turn OFF the ignition.
Notice: If the engine coolant temperature is above 140°F (60°C), high fuel pressure readings may result due to hot soak fuel boiling. With
the engine OFF, the fuel pressure may increase beyond the pressure relief regulator valve's setting point of 100 psi (690 kPa) ± 5 percent.

2.

Install the CH-37287-1A Fuel Pressure Gauge Adapter and the CH-48027 Digital Fuel Pressure Gauge. Refer to Fuel Pressure Gauge Installation and
Removal in SI.

3.

Turn ON the ignition, with the engine OFF.

4.

Command the Fuel Pump Enable ON several times, in order to obtain the highest possible fuel pressure.

5.

Verify that the CH-48027 fuel pressure is within the specified range with the fuel pump running.

6.

⇒

If the CH-48027 fuel pressure is within the specified range, Go to Step 6.

⇒

If the CH-48027 fuel pressure is not within the specified range, refer to Fuel System Diagnosis in SI.

Verify that the CH-48027 fuel pressure and the Fuel Pressure Sensor parameter agree or are within a range of +/− 5 psi (34 kPa).
⇒

If the CH-48027 fuel pressure and the Fuel Pressure Sensor parameter are not within the specified range, perform the following:

6.1. Inspect the fuel system pipes and hoses for damage, such as kinks or pinches.
6.2. Test the wiring, terminals and connectors of the Body Harness to Fuel Tank Harness (on the Corvette the Rear Chassis Harness to Fuel Tank
Primary Harness), the B47 Fuel Pressure Sensor and the K111 Fuel Pump Driver Control Module and the ground circuit that it uses for good
continuity and intermittent conditions and poor connections. Refer to Testing for Continuity, Testing for Electrical Intermittents and Testing for
Intermittent Conditions and Poor Connections and Ground Distribution Schematics in SI.

7.

⇒

If any fuel system pipes or hoses exhibit damage, repair as necessary.

⇒

If poor continuity or intermittent conditions and poor connections are found, repair as necessary. Refer to Wiring Repairs, Repairing Connector
Terminals and Connector Repairs in SI.

⇒

If fuel system pipe or hose damage is not observed and poor continuity and intermittent conditions and poor connections are not found, replace the
B47 Fuel Pressure Sensor. Refer to Fuel Pressure Sensor Replacement in SI.

No other action is required as the Service Message will automatically clear once the fuel system is serviced properly and the vehicle is operated over a
number of ignition cycles. Other on board DTCs may have set.
Use the scan tool to clear ALL DTCs prior to releasing the vehicle to the Customer.

8.

Submit the correct Bulletin Only Labor Operation for this repair: 4080638*.

6

Proactive Alert Engine Controls & Fuel Service Message Identifier ECF004
1.

Turn OFF the ignition.
Notice: If the engine coolant temperature is above 140°F (60°C), high fuel pressure readings may result due to hot soak fuel boiling. With
the engine OFF, the fuel pressure may increase beyond the pressure relief regulator valve's setting point of 690 kPa (100 PSI) ± 5 percent.

2.

Install the CH-37287-1A Fuel Pressure Gauge Adapter and the CH-48027 Digital Fuel Pressure Gauge. Refer to Fuel Pressure Gauge Installation and
Removal in SI.

3.

Turn ON the ignition, with the engine OFF.

4.

Command the Fuel Pump Enable ON several times, in order to obtain the highest possible fuel pressure.

5.

Verify that the CH-48027 fuel pressure and the Fuel Pressure Sensor parameter agree or are within a range of +/− 5 psi (34 kPa). If the CH-48027 fuel
pressure and the Fuel Pressure Sensor parameter are not within the specified range, inspect the wiring, terminals and connector of the B47 Fuel
Pressure Sensor for poor continuity and intermittent conditions and poor connections. Refer to Testing for Continuity and Testing for Intermittent
Conditions and Poor Connections in SI.

6.

⇒

If a condition is found, repair as necessary. Refer to Wiring Repairs, Repairing Connector Terminals and Connector Repairs in SI.

⇒

If a condition is not found, replace the B47 Fuel Pressure Sensor. Refer to Fuel Pressure Sensor Replacement in SI.

No other action is required as the Service Message will automatically clear once the fuel pressure sensor system is serviced properly and the vehicle is
operated over a number of ignition cycles. Other on board DTCs may have set.
Use the scan tool to clear ALL DTCs prior to releasing the vehicle to the Customer.

7.

Submit the correct Bulletin Only Labor Operation for this repair: 4080648*.

Warranty Information
For vehicles repaired under warranty, use:
Labor Operation

4080568*

Description

Proactive Alert Starting & Charging Service Message
Identifier SAC001

Labor Time

Labor Time

Labor Time

2015-2016
Equinox, Terrain

2016 Corvette

2016 Escalade,
Escalade ESV,
Silverado LD,
Suburban, Tahoe,
Sierra LD, Yukon,
Yukon XL

0.3 hr

0.4 hr

Escalade, Escalade
ESV, Suburban,
Tahoe 0.5 hr
—
Silverado, Sierra
0.4 hr

7

4080578*

Proactive Alert Starting & Charging Service Message
Identifier SAC002

0.3 hr
Diagnostic Add
Time: 0-.5 hr

Battery
Replacement 0.4 hr
Diagnostic Add
Time: 0-.5 hr
OR
Battery Cable
Positive
Replacement 3.3
hrs
Diagnostic Add
Time: 0-.5 hr

Escalade, Escalade
ESV, Suburban,
Tahoe 0.5 hr
Diagnostic Add
Time: 0-.5 hr
—
Silverado, Sierra
0.4 hr
Diagnostic Add
Time: 0-.5 hr

OR
Starter Solenoid
Cable Replacement
1.5 hrs
Diagnostic Add
Time: 0-.5 hr
OR
Battery Cable
Negative
Replacement 0.3 hr
Diagnostic Add
Time: 0-.5 hr
4080588*

4080598*

Proactive Alert Starting & Charging Service Message
Identifier SAC003

Proactive Alert Starting & Charging Service Message
Identifier SAC004

0.3 hr

0.3 hr

0.3 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

0.6 hr

Starter
Replacement 0.7 hr

Escalade, Escalade
ESV, Suburban,
Tahoe 0.5 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr
OR
Battery Cable
Positive
Replacement 3.3
hrs
Diagnostic Add
Time: 0-.5 hr
OR
Starter Solenoid
Cable Replacement
1.5 hrs
Diagnostic Add
Time: 0-.5 hr
OR
Battery Cable
Negative
Replacement 0.3 hr
Diagnostic Add
Time: 0-.5 hr

8

Diagnostic Add
Time: 0-.5 hr
—
Silverado, Sierra
0.8 hr
Diagnostic Add
Time: 0-.5 hr

4080608*

Proactive Alert Starting & Charging Service Message
Identifier SAC005

0.6 hr
Diagnostic Add
Time: 0-.5 hr

Battery
Replacement 0.4 hr
Diagnostic Add
Time: 0-.5 hr
OR
Starter
Replacement 0.7 hr
Diagnostic Add
Time: 0-.5 hr
OR

Escalade, Escalade
ESV, Suburban,
Tahoe 0.5 hr
Diagnostic Add
Time: 0-.5 hr
—
Silverado, Sierra
0.8 hr
Diagnostic Add
Time: 0-.5 hr

Battery Cable
Positive
Replacement 3.3
hrs
Diagnostic Add
Time: 0-.5 hr
OR
Starter Solenoid
Cable Replacement
1.5 hrs
Diagnostic Add
Time: 0-.5 hr
OR
Battery Cable
Negative
Replacement 0.3 hr
Diagnostic Add
Time: 0-.5 hr
4080618*

4080628*

Proactive Alert Engine Controls & Fuel Service
Message Identifier ECF001

Proactive Alert Engine Controls & Fuel Service
Message Identifier ECF002

FWD 1.7 hrs

11.9 hrs

1.8 hrs

FWD 1.7 hrs

11.9 hrs

1.8 hrs

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

AWD 2.5 hrs

AWD 2.5 hrs
Diagnostic Add
Time: 0-.5 hr

9

4080638*

Proactive Alert Engine Controls & Fuel Service
Message Identifier ECF003

Fuel Tank Fuel
Pump Module
Replacement

Fuel Tank Fuel
Pump Module
Replacement

Fuel Tank Fuel
Pump Module
Replacement

FWD 1.7 hrs

11.9 hrs

1.8 hrs

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

AWD 2.5 hrs

OR

OR

Diagnostic Add
Time: 0-.5 hr

Fuel Pressure
Sensor
Replacement

Fuel Pressure
Sensor
Replacement

1.7 hrs

0.3 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

0.5 hr

1.7 hrs

0.3 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

Diagnostic Add
Time: 0-.5 hr

OR
Fuel Pressure
Sensor
Replacement
0.3 hr
Diagnostic Add
Time: 0-.5 hr
4080648*

Proactive Alert Engine Controls & Fuel Service
Message Identifier ECF004

*This is a unique Labor Operation for Bulletin use only. It will not be published in the Labor Time Guide.

ACDelco™ is a Trademark of General Motors LLC
OnStar® is a Registered Trademark of OnStar, LLC.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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