![]() The isolator's role is to allow the alternator to assist with charging the primary battery, while at the same time not allowing other loads in the charging system to drain the primary battery. Regardless of how many batteries are available, the current flow from one battery to another will continue until all batteries in the electrical system reach the same charge level and may prevent the engine from starting.Ī battery isolator can eliminate the problem of battery drain all together. The current in the fully charged battery will drain to the less-charged battery, until both reach a common lower charge level, or even worse, discharge completely. This arrangement can present a problem when a fully charged battery is connected to a partially discharged or dead battery. Many 12-volt electrical systems rely on at least one battery to start the engine and another to power accessories. Generally built with diodes, isolators ensure that charge is evenly distributed between multiple batteries and the alternator. Despite seeming very similar, however, they function in different ways.īattery isolators are best seen as the distribution point of an automotive electrical system. Managing multiple batteries is where battery isolators and separators come into play. However, simply wiring extra batteries into a vehicle’s electrical system can allow auxiliary batteries to drain power from the main battery, inhibiting engine starting and other essential functions. For these applications, having a multiple battery system is essential. The addition of electrical loads such as lights, entertainment systems, communications equipment and other accessories continue to draw power when the engine is off. However, this requires balancing the needs of the battery against those of the electrical system. A PCM programming malfunction is the result of this and can be fixed by taking your truck to a Dodge dealer and having them reprogram the PCM.Controlling parasitic loads (battery drain) and properly distributing electrical power is crucial to keeping vehicles working. Pre-2006 Cummins trucks had a common issue relating to a “check gauges” light combined with these three engine codes. When you receive these codes all together, you might need to have your PCM reprogrammed.ĭodge/Ram released a Technical Service Bulletin (TSB) with number 18-001-07. These codes are known to appear alongside the P2509 code and will read ‘Charging System Voltage Low’. Engine shutoff while driving (if battery is being drained faster than charged).Battery voltage indicator is below 11 volts.Hard start, no start (will usually still crank).The obvious symptom is the code itself, however, some additional symptoms may appear: Test your alternator and replace this if you don’t have any battery issues. ![]() A weak alternator can cause your Cummins to not be able to start or continue running. If you are getting this fault code and have checked your battery connection, cables, and voltage, your issue could be your alternator. Bad alternator (over or undercharging batteries).Bad battery connection (check connector cables).However, replacing the battery isn’t always the answer. The majority of owners report that changing the battery solves the problem. For most Cummins owners, P2509 is an issue with the driver-side battery. One battery is located on the driver side, and one on the passenger side within the engine bay. Most Cummins diesel engines have a dual-battery setup. While all signs point to the battery, this trouble code can actually be caused by a number of issues, and replacing the battery isn’t always the answer. Either your battery is weak and running low voltages, something is draining your batter faster than it can charge, or there is a poor electrical connection. Electronic signals are measured within parameters, and when the signal falls outside of the parameter range, the Power Input Signal Intermittent Code P2509 is thrown.Ī Cummins P2509 engine code is a battery related issue. P2509 appears on Cummins engines when there is an electronic signal being sent to the ECM/PCM that is faulty or intermittent. When you scan your Dodge/Ram Cummins engine and receive a P2509 diagnostic code, it will read ‘ECM/PCM Power Input Signal Intermittent Code’.
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