Error Code P069E is defined as Fuel Pump Control Module Requested MIL Illumination. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II scanner, particularly those made since 1996 up to present. This includes vehicle models from, but not limited to, Buick, Cadillac, Chevrolet, Ford, GMC, etc. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another.
The fuel pump control module works by supplying and regulating the voltage to the fuel pump relay and fuel pump. Usually, the fuel pump controller is integrated right into the PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes), but can also be a stand-alone module. The fuel pump provides pressurized fuel for the fuel injection system and usually placed inside the fuel tank. Sometimes, it’s located along the fuel rail. Most diesel propulsion systems use high-pressure pumps mounted on and driven by the engine.
Every time the ignition is turned on (the PCM is energized), multiple controllers will initiate self-tests. One of which is the fuel pump control module, which is included in the controllers. By conducting internal controller self-tests, the PCM can monitor serial data carried over the CAN (controller area network), ensuring onboard controllers are interfacing properly.
When Error Code P069E is stored, this means the PCM has determined a malfunction in the fuel pump control module, causing the illumination of the Check Engine light.
- Delayed or no start condition
- Engine drivability issues
Other stored codes may be present as well.
There are multiple causes for this code, including:
- Defective fuel pump controller or PCM
- Bad or tripped fuel pump voltage shutoff (inertia) switch
- Open fuel pump control module voltage supply circuit
- Failed or programming error in PCM
How to Check
If there are other related fuel pump or fuel pump codes stored in the vehicle, then they must be diagnosed and repaired first before attempting to address Error Code P069E.
As with most codes, it’s important to refer with the TSB (technical service bulletin) regarding the code and its symptoms, with vehicle year, make, model and engine considered.
A diagnostic scanner, DVOM (digital volt-ohmmeter), and a source of reliable vehicle information are required in diagnosing this code.
Connect the scanner and retrieve all stored codes, including their freeze frame data. Write these down in case the problem is proven to be intermittent. Then, clear the codes and take the vehicle for a test drive (if possible), until the code resets, or the PCM enters readiness mode.
If the vehicle enters readiness mode, then the problem is intermittent. This means you need to wait for the problem to worsen before you can properly diagnose it. If the code resets immediately, then continue with the diagnosis.
Then, use your DVOM and the right wiring diagram to check if there is battery voltage on the fuel pump control circuit. Then, check system fuses and relays, and replace defective parts as necessary.
If the vehicle comes equipped with the fuel pump voltage shutoff switch, then test it to make sure it’s not defective or has not been activated.
If you find no voltage (and/or ground) in the fuel pump control circuit (and all fuses and relays look good and functioning properly), then inspect the controller related wiring and harnesses. Check the chassis and engine ground junctions as well. Again, use the vehicle information source to find the right ground locations and related circuits.
If voltage (and ground) is present on the fuel pump control circuit, then proceed on inspecting the system controller. Look for signs of water or water damage, heat, or collision damage. Any damaged controller (particularly those affected by water) must be considered defective.
How to Fix
Depending on the diagnosis, possible repairs for this code include:
- Replacement of defective pump controller
- Repair or replacement f damaged fuses and relays
- Repair or replacement of damaged wiring and harnesses
- Replacement and reprogramming of controller
If the controller power and ground circuits are both intact, then you can suspect a defective controller or programming error. In which case, controller replacement and reprogramming are necessary.