If you can access codes from the FPCM module, then the U0109 code is either intermittent or a memory code. If your scan tool can access fault codes and the only one you get from other modules is the U0109, try to communicate with the FPCM module. Misdiagnosis has been known to occur if you diagnose the U0109 code before any of the basic codes have been thoroughly diagnosed and dismissed. If any of them are bus communication related, or battery / ignition related, diagnose them first. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis.įirst, note if there are any other diagnostic fault codes. Short to ground in either CAN bus circuitĪ good starting point is always to check for technical service bulletins (TSB) for your particular vehicle.Short to power in either CAN bus circuit.Typically the causes for this code to set are: If the engine does run: Hesitation Lack of power Poor performance Misfiring cylinders (runs rough).Symptoms of a U0109 engine code may include: Troubleshooting steps may vary depending upon manufacturer, type of communications system, number of wires and wire colors in the communication system. Gasoline engines more commonly use these modules, although use in late model diesel engines is increasing. If no information is received, no fuel pump operation will occur. The FPCM operates the fuel pump based upon information received from the Powertrain Control Module (PCM). Without this CAN bus, control modules cannot exchange information, and your scan tool may not be able to get information from the vehicle, depending on which circuit is affected. The circuit most often used to communicate with is known as Controller Area Network bus communications, or simply put, CAN bus. This code means that the Fuel Pump Control Module (FPCM) and other control modules on the vehicle are not communicating with each other. This is a generic communication system diagnostic trouble code that applies to most vehicle makes and models, including but not limited to Dodge, Ram, Chevrolet, Ford, GMC, and VW. Lost Communication with Fuel Pump Control Module (FPCM) What does that mean?
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