Low fuel pressure code

Good morning,

What is the code that was set?

Yes, check the pressure. Once I know the pressure, we can continue from there.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy

Hi,

Here are directions from the manufacturer for testing and diagnosing the fuel system on this vehicle. If you want, you could put a T between the supply line and the rail. They make them for this purpose with a schrader. Most parts stores will lend or rent one to you.

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2013 GMC Truck Terrain FWD L4-2.4L
Fuel System Diagnosis
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics Fuel System Diagnosis
FUEL SYSTEM DIAGNOSIS
Fuel System Diagnosis

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis See: Vehicle > Initial Inspection and Diagnostic Overview > Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is ON. The voltage from the ECM to the fuel pump control module remains active for 2 s, unless the engine is in Crank or Run. While this voltage is being received, the fuel pump control module closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank module in order to maintain the desired fuel rail pressure.

The fuel system is an electronic returnless on-demand design. A returnless fuel system reduces the internal temperature of the fuel tank by not returning hot fuel from the engine to the fuel tank. Reducing the internal temperature of the fuel tank results in lower evaporative emissions.

An electric turbine style fuel pump attaches to the primary fuel pump module inside the fuel tank. The fuel pump supplies fuel through the fuel feed pipe to the high pressure fuel pump. The high pressure fuel pump supplies fuel to a variable-pressure fuel rail. Fuel enters the combustion chamber through precision multi-hole fuel injectors. The high pressure fuel pump, fuel rail pressure, fuel injection timing, and injection duration are controlled by the engine control module (ECM).

The primary fuel tank module also contains a primary jet pump and a secondary jet pump. Fuel pump flow loss, caused by vapor expulsion in the pump inlet chamber, is diverted to the primary jet pump and the secondary jet pump through a restrictive orifice located on the pump cover. The primary jet pump fills the reservoir of the primary fuel tank module. The secondary jet pump creates a venturi action which causes the fuel to be drawn from the secondary side of the fuel tank, through the fuel transfer pipe, to the primary side of the fuel tank.

Diagnostic Aids

The fuel injectors are calibrated to begin operating at 0.7 Mpa (101.5 psi) at 20-32°C (68-90°F). This specification will vary when the temperature is outside of this range.

Reference Information

Description and Operation

Fuel System Description See: Computers and Control Systems > Components > Fuel System Description

Electrical Information Reference

* Circuit Testing See: Vehicle > Component Tests and General Diagnostics > Circuit Testing

* Connector Repairs See: Vehicle > Component Tests and General Diagnostics > Connector Repairs

* Testing for Intermittent Conditions and Poor Connections See: Vehicle > Component Tests and General Diagnostics > Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs See: Vehicle > Component Tests and General Diagnostics > Wiring Repairs

Scan Tool Reference

Control Module References See: Vehicle > Programming and Relearning > Control Module References for scan tool information

Special Tools

* CH 48027 - Digital Pressure Gauge

* J 37287 - Fuel Line Shut-off Adapter

Circuit/System Verification

Note:

* Repair all fuel system related DTCs before performing this diagnostic.

* Inspect the fuel system for damage or external leaks before proceeding.

* Verify that adequate fuel is in the fuel tank before proceeding.

* The Fuel Pump Enable may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.

* Before proceeding with this test review the User Manual CH 48027-5 for Safety Information and Instructions.

1. Ignition OFF, all accessories OFF, install a CH 48027 - Gauge. Refer to Fuel Pressure Gauge Installation and Removal See: Fuel Pressure > Component Tests and General Diagnostics > Fuel Pressure Gauge Installation and Removal.

Note:
DO NOT perform the Fuel System Diagnosis if the engine coolant temperature is above 60°C (150°F). 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. Ignition ON, engine OFF, command the Fuel Pump Enable ON with a scan tool. Verify the fuel pressure is between 345-690 kPa (50-100 psi) with the fuel pump running.

3. Engine idling at normal operating temperature, the Fuel Pump Flow Control Module Fuel Pressure Sensor parameter should read between 300-400 kPa (43-58 psi).

Circuit/System Testing

Note:

* The Fuel Pump Enable may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.

* DO NOT start the engine.

1. Ignition ON, engine OFF, command the Fuel Pump Enable ON with a scan tool and observe the fuel pressure gauge while the fuel pump is operating. Verify the fuel pressure is between 345-690 kPa (50-100 psi).

If the fuel pressure is greater than the specified range, replace the primary fuel tank module.

If the fuel pressure is less than the specified range, test, inspect, and repair the items listed below. If all items test normal, replace the primary fuel tank module.

* Restricted fuel feed pipe

* Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.

2. Verify that the fuel pressure, after the fuel pump is turned off, decreases to 500-599 kPa (72-87 psi), and does not decrease more than 34 kPa (5 psi) in 1 minute from that point.

If the fuel pressure stays above 600 kPa (87 psi), replace the primary fuel tank module.

If the fuel pressure decreases more than the specified value, perform the following procedure:

1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief See: Fuel Pressure Release > Procedures > Fuel Pressure Relief.

2. Install the J 37287 - Adapter between the chassis fuel feed hose and the engine compartment fuel feed pipe.

3. Open the valve on the J 37287 - Adapter.

4. Ignition ON, command the Fuel Pump Enable ON with a scan tool and bleed the air from the CH 48027 - Gauge.

5. Command the Fuel Pump Enable ON and then OFF with a scan tool.

6. Close the valve on the J 37287 - Adapter.

7. Monitor the fuel pressure for 1 min.

If the fuel pressure decreases more than 34 kPa (5 psi) within the specified time, locate and replace the leaking fuel injector(s).

If the fuel pressure does not decrease more than 34 kPa (5 psi) within the specified time, replace the primary fuel tank module.

3. Relieve the fuel pressure to 69 kPa (10 psi). Verify that the fuel pressure does not decrease more than 14 kPa (2 psi) in 5 min.

If the fuel pressure decreases more than the specified value, replace the primary fuel tank module.

4. Operate the vehicle within the conditions of the customer's concern while monitoring the fuel pressure with the CH 48027 - Gauge. The fuel pressure should not drop off during acceleration, cruise or hard cornering.

If the fuel pressure drops off, test, inspect, and repair the items listed below. If all items test normal, replace the primary fuel tank module.

* Restricted fuel feed pipe

* Inspect the harness connectors and the ground circuits of the fuel pump for poor connections

5. If the fuel system tests normal, refer to Symptoms - Engine Controls See: Computers and Control Systems > Symptom Related Diagnostic Procedures > Symptoms - Engine Controls , Fuel Injector Solenoid Coil Test See: Computers and Control Systems > Component Tests and General Diagnostics > Fuel Injector Solenoid Coil Test , and Fuel Injector Balance Test See: Computers and Control Systems > Component Tests and General Diagnostics > Fuel Injector Balance Test.

Repair Instructions

Perform the Diagnostic Repair Verification See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests > Diagnostic Repair Verification after completing the diagnostic procedure.

* Direct Fuel Injector Replacement See: Fuel Injector > Removal and Replacement > Direct Fuel Injector Replacement

* Fuel Feed Pipe Replacement (With Direct Injection) See: Fuel Supply Line > Removal and Replacement > Fuel Feed Pipe Replacement (With Direct Injection)

* Fuel Tank Fuel Pump Module Replacement See: Fuel Pump > Removal and Replacement Fuel Tank Fuel Pump Module Replacement

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Here is a link explaining in general how to perform a fuel pressure test:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let me know if this helps.

Take care,
Joe

We need to be careful with this vehicle because you have a high pressure fuel system so a regular gauge and procedure is not going to work.

I attached the detail on who to test this system. There are adapters that you will need in order to test this properly. Plus they call for a digital gauge. That is not required but you will need a comparable gauge.

Read through this info and let me know if you have questions. Also, if you can provide the actual code that way the actual test for that code can give us a better idea what the issue is. Thanks

You can rent a tester at any parts store. It will come with directions for using it.

Roy

Okay, you need to test the actual fuel pressure.

Roy

DTC P0089, P00C6, P228C, or P228D

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis See: Vehicle > Initial Inspection and Diagnostic Overview > Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0089
Fuel Pressure Regulator Performance

DTC P00C6
Fuel Rail Pressure Low During Engine Cranking

DTC P228C
Fuel Pressure Regulator 1 Control Performance - Low Pressure

DTC P228D
Fuel Pressure Regulator 1 Control Performance - High Pressure

Circuit/System Description

The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground.

The high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

Conditions for Running the DTC

P0089, P228C, or P228D

DTC P0016, P0017, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0112, P0113, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0365, P0366, P0627, P0628, P0629 or P1682 is not set.

The ignition voltage is more than 11 V.

The engine is running.

The low side fuel pressure is more than 275 kPa (40 psi).

The DTC runs continuously when the above conditions are met for 60 s.

P00C6

DTC P0016, P0017, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0112, P0113, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0365, P0366, P0627, P0628, P0629 or P1682 is not set.

The ignition voltage is more than 8 V.

The engine coolant temperature is between -100 and +80°C (-148 and +176°F).

The low side fuel pressure is more than 300 kPa (43.5 psi).

The engine is not running.

The DTC runs once for each engine start.

Conditions for Setting the DTC

P0089

The high pressure fuel pump actuator command is greater than or equal to 240 ° or less than or equal to 0 °. The condition exists for greater than 5 s.

P00C6

The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.

P228C

The actual fuel rail pressure is 3 MPa (435 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.

P228D

The actual fuel rail pressure is 3 MPa (435 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0089 and P00C6 are Type B DTCs.

DTCs P228C and P228D are Type A DTCs.

A message center or an indicator displays Reduced Engine Power.

Scan tool control of the high pressure fuel pump is inhibited.

Conditions for Clearing the DTC

DTCs P0089 and P00C6 are Type B DTCs.

DTCs P228C and P228D are Type A DTCs.

Diagnostic Aids

A restricted fuel feed pipe between the fuel feed pipe fuel pressure sensor and the high pressure fuel pump may set a DTC.

A condition with the fuel tank fuel pump module or the fuel pump flow control module may set a DTC.

A skewed fuel rail pressure sensor, or an intermittent condition in the fuel rail pressure sensor circuits may set a DTC.

A leaking or restricted fuel injector may set a DTC.

A short to voltage in the crankshaft position signal circuit may set a DTC.

A short to voltage in the camshaft position actuator solenoid valve control circuit may set a DTC.

Reference Information

Schematic Reference

Engine Controls Schematics See: Powertrain Management > Electrical > Engine Controls Schematics

Connector End View Reference

Component Connector End Views See: Vehicle > Connector Views > Sunshade - Left Front

Description and Operation

Fuel System Description See: Computers and Control Systems > Components > Fuel System Description

Electrical Information Reference

Circuit Testing See: Vehicle > Component Tests and General Diagnostics > Circuit Testing

Connector Repairs See: Vehicle > Component Tests and General Diagnostics > Connector Repairs

Testing for Intermittent Conditions and Poor Connections See: Vehicle > Component Tests and General Diagnostics > Testing for Intermittent Conditions and Poor Connections

Wiring Repairs See: Vehicle > Component Tests and General Diagnostics > Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References See: Vehicle > Programming and Relearning > Control Module References for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0627, P0628, P0629, P069E, or U0109 should not set.

If a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Diagnostic Trouble Code (DTC) List - Vehicle.

2. Attempt to start and idle the engine.

3. Observe the DTC information with a scan tool. DTCs P0089, P00C6, P228C, and P228D should not set.

4. Engine idling, observe the Fuel Rail Pressure Sensor parameter with a scan tool. The pressure should be approximately 2.96-3.24 Mpa (429-470 psi).

5. Command an increase and decrease in Fuel Pressure with a scan tool. Observe the scan tool Fuel Rail Pressure Sensor parameter. The Fuel Rail Pressure Sensor should increase or decrease with each commanded state.

6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: Circuit/System Verification must be performed first or misdiagnosis may result.

1. Ignition ON, observe the scan tool Fuel Pump Control Module Fuel Pressure Sensor parameter. Command an increase in Fuel Pressure with a scan tool. Verify the scan tool Fuel Pressure Sensor parameter increases to greater than 414 kPa (60 psi) as commanded.

If less than the specified range, refer to Fuel System Diagnosis See: Computers and Control Systems > Component Tests and General Diagnostics > Fuel System Diagnosis.

2. Remove the G18 high pressure fuel pump and visually inspect the lobes on the camshaft for unusual wear.

If the lobes appear normal, replace the G18 high pressure fuel pump.

If the lobes are worn, replace the camshaft.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the G18 high pressure fuel pump.

Note: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis.

2. Test for 10 ohms plus/minus 1 ohms at 25°C (77°F) between the low control circuit terminal 1 and the high control circuit terminal 2.

If not within the specified range, replace the G18 high pressure fuel pump.

3. Test for infinite resistance between each terminal and the G18 high pressure fuel pump housing.

If not the specified value, replace the G18 high pressure fuel pump.

Repair Instructions

Perform the Diagnostic Repair Verification See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests > Diagnostic Repair Verification after completing the diagnostic procedure.

Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement See: Fuel Pressure Sensor/Switch > Removal and Replacement > Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement

Fuel Pump Replacement See: Fuel Pump > Removal and Replacement > Fuel Pump Replacement

Intake Camshaft and Valve Lifter Replacement See: Camshaft, Engine > Removal and Replacement > Intake Camshaft and Valve Lifter Replacement

P006C - Fuel rail pressure low during engine cranking

Here is the testing for this code. You will need to follow this through to find out where the issue is. Basically this is saying that the low pressure side of the fuel system is ok but the high pressure side is not building the pressure needed to start the vehicle. This is most likely a high pressure pump or restriction in the line. However, this testing will tell us what the issue is.

Let us know if you have questions and we can work through this with you. Thanks