Fix P069E: Mechanic’s solutions that WORKED

The code P069E: Fuel Pump Control Module Requested MIL Illumination is specifically related to the Fuel Pump Control Module (FPCM) and is an indicator that this module has requested the Malfunction Indicator Lamp (MIL) to illuminate. This usually means there are other issues within the fuel system or related components that need to be addressed, which have prompted the FPCM to signal a warning.

P069E quick overview

Meaning	P069E: Fuel Pump Control Module Requested MIL Illumination
Is it serious?	Potentially, as it can impact fuel delivery and vehicle performance.
Possible causes	– Faulty Fuel Pump Control Module (FPCM) – Issues with the fuel pump or fuel system – Wiring or connector problems related to the FPCM – CAN communication issues – Other related component failures triggering the FPCM request
How to diagnose?	Retrieve codes: Check for additional codes that may have caused the FPCM to request the MIL. Visual inspection: Examine the wiring and connectors for the FPCM and related components. Fuel system inspection: Check the fuel pump operation and fuel pressure. Electrical testing: Verify power and ground supply to the FPCM. CAN network testing: Check the Controller Area Network for communication faults. Component tests: Test the FPCM and related sensors or actuators.

How to fix P069E – learn from mechanics

I looked into P069E service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: GMC

Vehicle Information 2009 GMC Yukon XL 1500 SLT 5.3L

Issue + Repair History

• Malfunction Indicator Lamp (MIL) on
• Codes: P069E, P0606
• Symptoms: Vehicle dying intermittently
• Previous repair: None mentioned

Other OBD2 Codes + Test Results

• None additional mentioned

Suggestions to Fix Issue

• Check Fuel Pump Control Module (FPCM) circuit
• Inspect module and wiring for damage
• Consider possible impact damage from collision
• Reflash FPCM
• Scan for additional codes with updated Tech 2

Final Fix

• Replaced damaged Fuel Pump Control Module
• Reflashed module due to outdated Tech 2 software
• Issue resolved, vehicle runs well

Case #2: Chevrolet

Vehicle Information 2008 Chevrolet Tahoe LTZ 5.3L

Issue + Repair History

• MIL Lamp on, vehicle stalling
• Codes: P0456 (Evap small leak), P069E, Lean codes for both banks
• Symptoms: Poor running, fluctuating fuel pressure
• Previous repairs: Replaced fuel pump assembly 3 times

Other OBD2 Codes + Test Results

• None additional mentioned

Suggestions to Fix Issue

• Check wiring and connections at fuel pump
• Test fuel pressure and compare with sensor readings
• Load test power and grounds to fuel pump
• Consider fuel pump module or relay issues
• Look into TSB/recall 14515B
• Inspect chassis grounds, especially braided straps

Final Fix

• Replaced fuel pump again after testing fuel pressure and load testing power/grounds
• Vehicle running well, no codes at this time

Case #3: Cadillac

Vehicle Information 2009 Cadillac Escalade EXT 6.2L

Issue + Repair History

• Vehicle stalled, customer managed to limp home
• Fuel pressure too high (85 PSI)
• Replaced fuel pump module, pressure still high
• Fuel Pressure Control Module (FPCM) not communicating with ECM
• Corrosion found in the connector and module pins

OBD2 Codes + Test Results

• P069E: FPCM requested MIL
• Fuel pressure: 85 PSI

Suggestions to Fix Issue

• Confirm if the fuel pump control module or the fuel pump module was replaced
• Use a quality scan tool to command the control module and perform pin-out testing at the fuel pump control module
• Check codes in the FPCM
• Assess the voltage at the pressure sensor (4.7 volts seems too high)
• Inspect the FPCM for damage, failure, or wiring issues
• Consider replacing the FPCM and programming it to the vehicle

Final Fix

• Vehicle sent to dealer for FPCM and connector replacement due to lack of programming capabilities at the service center
• Corrosion in the connector and module pins noted, likely contributing to the communication issue between FPCM and ECM

Case #4: Chevrolet

Vehicle Information
2009 Chevrolet Silverado 1500 LT, 4.8L engine

Issue + Repair History

• Malfunction Indicator Lamp (MIL) illuminated
• Codes: P069E (Fuel Pump Control Module Request Malfunction Light), P0191 (Fuel Rail Pressure Sensor Circuit Performance)
• Symptoms: Overfueling problem with 80psi at all times at fuel rail
• Previous repairs: Fuel pump assembly replaced with a new dealer pump

What Are People Suggesting to Fix Issue

• Check the Fuel Pump Control Module (FPCM) as a potential cause

What Was the Final Fix

• Replacing the fuel pump driver module and reprogramming it to the vehicle resolved the overfueling issue.

Case #5: GMC

Vehicle Information
2008 GMC Sierra 1500 WT, 5.3L engine

Issue + Repair History

• Malfunction Indicator Lamp (MIL) on
• Previous repairs: aftermarket fuel pump replaced with OEM due to MIL illumination, new fuel pressure sensor, new fuel control module
• Codes: P0191 (Fuel Rail Pressure Sensor Circuit), P0449 (Evaporative Emission Control System Vent Valve/Solenoid Circuit), P069E (Fuel Pump Control Module Request MIL)
• Symptoms: Long crank time after sitting for hours, fuel pressure drops to zero in two seconds after turning key off, lean codes for bank 1 and bank 2 downstream sensors

Other OBD2 Codes + Test Results

• P0191 (Fuel Rail Pressure Sensor Circuit)
• P0449 (Evaporative Emission Control System Vent Valve/Solenoid Circuit)
• P069E (Fuel Pump Control Module Request MIL)

What Are People Suggesting to Fix Issue

• Check for excess amp draw on the fuel pump and potential bad fuel pump relay
• Load test large power and ground wires at the fuel pump control module
• Perform amp and voltage drop tests
• Investigate potential mechanical leakage (pump check valve, injector, regulator)
• Check all grounds for corrosion
• Examine the Electronic Returnless Fuel System (ERFS), potentially a fuel pressure regulator
• Inspect for wiring harness short to ground near the transfer case side of the front drive shaft
• Check for any kind of fuel leak (regulator, injector, or fuel lines), and perform a voltage drop test

What Was the Final Fix

• Another OEM fuel pump was installed after a clamp test on the plastic fuel line indicated a rapid pressure drop, suggesting an issue with the check valve in the pump. This resolved the issue, and the customer picked up the truck.

Common Advice	Brief Description of Diagnostic Step
Check for mechanical leakage	Investigate potential leakage in the fuel system, particularly at the pump check valve, injectors, or fuel pressure regulator.
Inspect fuel pump and relay	Perform tests on the fuel pump and relay for excess amp draw, which might indicate resistance issues or a failing component.
Load test power and ground wires	Specifically load test the large power and ground wires at the fuel pump control module to ensure they are functioning to full potential.
Perform amp and voltage drop tests	These tests can help identify issues with the electrical system that might be causing the fault code.
Examine grounds for corrosion	Corroded grounds can cause a variety of electrical issues, including triggering fault codes.
Investigate the fuel pressure regulator (ERFS)	Check the Electronic Returnless Fuel System, as it could be related to the pressure sensor code.
Check for wiring harness issues	Look for potential shorts to ground in the wiring harness, especially near the front drive shaft or transfer case.
Inspect for fuel leaks	Check for leaks in the fuel lines, regulator, or injectors, as these can lead to pressure loss and triggering of the fault code.
Re-evaluate the installation of new components	Ensure that newly installed components like fuel pumps are functioning correctly and aren’t defective.
Review Technical Service Bulletins (TSBs)	Check for any TSBs that might be related to the issue, as they can provide valuable insights and recommended fixes.