What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
U0109-00Lost Communication With Fuel Pump Control ModuleU0109Lost Communication With Fuel Pump Control ModuleManufacturer communications
38Original wording in English
RAM
Reported code forms U0109-00
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes…
RAM
Reported code forms U0109-00
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes…
RAM
Reported code forms U0109-00
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ●…
RAM
Reported code forms U0109-00
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ●…
RAM
Reported code forms U0109-00
Flash: Powertrain Control Module (PCM) Updates V2D Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble…
RAM
Reported code forms U0109-00
Flash: Powertrain Control Module (PCM) Updates V2D Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble…
Check vehicle applicability
257A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | ATS | 2015 |
| Cadillac | ATS | 2014 |
| Cadillac | ATS | 2013 |
| Cadillac | CTS | 2014 |
| Cadillac | CTS | 2013 |
| Cadillac | CTS | 2012 |
| Cadillac | CTS | 2011 |
| Cadillac | CTS | 2010 |
| Cadillac | CTS | 2009 |
| Cadillac | CTS | 2008 |
| Cadillac | ESCALADE | 2014 |
| Cadillac | ESCALADE | 2013 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.