Dodge U02A9 Code is a diagnostic trouble code that is associated with the Powertrain Control Module (PCM) not receiving a LIN BUS message from the Charge Air Cooler Pump for 2.6 seconds. This trouble code can be caused by several factors, from a CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT being OPEN or SHORTED TO GROUND, to ASD RELAY OUTPUT CIRCUIT being OPEN or SHORTED TO GROUND, to a LIN BUS CIRCUIT being OPEN/HIGH RESISTANCE or SHORTED TO GROUND, and even to the CHARGE AIR COOLER PUMP and POWERTRAIN CONTROL MODULE themselves. Understanding the causes and solutions of Dodge U02A9 Code is necessary in order to diagnose and address this issue properly.
Causes and Solutions of Dodge U02A9 Code
| Cause | Solution |
|---|---|
| CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT OPEN | Inspect the fuse and replace it if necessary. |
| CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT SHORTED TO GROUND | Check for any electrical shorts, fix any that are found, and replace the fuse. |
| ASD RELAY OUTPUT CIRCUIT OPEN | Examine the wiring of the relay and ensure it is connected correctly. |
| ASD RELAY OUTPUT CIRCUIT SHORTED TO GROUND | Check for any electrical shorts and fix any that are found. |
CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT OPEN
When the CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT is OPEN, the solution is to inspect the fuse and replace it if necessary. If the fuse is found to be in working condition, then it is possible that there is an issue elsewhere in the wiring or the PCM itself.
CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT SHORTED TO GROUND
When the CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT is SHORTED TO GROUND, the solution is to check for any electrical shorts, fix any that are found, and replace the fuse. If the shorts are not found, it is possible there is an issue with the PCM itself.
ASD RELAY OUTPUT CIRCUIT OPEN
When the ASD RELAY OUTPUT CIRCUIT is OPEN, the solution is to examine the wiring of the relay and ensure it is connected correctly. It is possible that the relay is not connected correctly, or that the relay itself is malfunctioning.
ASD RELAY OUTPUT CIRCUIT SHORTED TO GROUND
When the ASD RELAY OUTPUT CIRCUIT is SHORTED TO GROUND, the solution is to check for any electrical shorts and fix any that are found. If the shorts are not found, it is possible there is an issue with the PCM itself.
Conclusion: Diagnosing Dodge U02A9 Code
Dodge U02A9 Code is a diagnostic trouble code that is associated with the Powertrain Control Module (PCM) not receiving a LIN BUS message from the Charge Air Cooler Pump. Understanding the causes and solutions of this trouble code is critical in order to diagnose and address it properly. The causes of Dodge U02A9 Code can range from a CHARGE AIR COOLER COOLANT PUMP FUSED B+ CIRCUIT being OPEN or SHORTED TO GROUND, to ASD RELAY OUTPUT CIRCUIT being OPEN or SHORTED TO GROUND, to a LIN BUS CIRCUIT being OPEN/HIGH RESISTANCE or SHORTED TO GROUND, and even to the CHARGE AIR COOLER PUMP and POWERTRAIN CONTROL MODULE themselves. Each of these causes has its own solution, such as inspecting the fuse, checking for electrical shorts, and examining the wiring of the relay. By identifying and addressing the causes of Dodge U02A9 Code, one can successfully diagnose and repair this issue.
https://www.youtube.com/watch?v=YbOCkvnnkAA