The Mitsubishi P1603 code is a diagnostic trouble code (DTC) related to a car’s engine starting sequence. This code is generated when the engine starting sequence is completed, but the battery positive voltage is higher than 10 volts and the battery backup line voltage has continued to be 6 volts or lower for 2 seconds. This code indicates a malfunction in the battery backup line, which can be caused by an open or shorted line, harness damage, connector damage, a failed ECM, or a failed PCM.
💥See also: Mitsubishi P1740 Code
Causes and Solutions for the Mitsubishi P1603 Code
| Cause | Solution |
|---|---|
| Open or shorted battery backup line | Inspect the line and repair any breaks or shorts. |
| Harness damage or connector damage | Replace the damaged harness or connector. |
| ECM failed | Replace the ECM. |
| PCM failed | Replace the PCM. |
The Mitsubishi P1603 code is a diagnostic trouble code that is generated when the engine starting sequence is completed and the battery positive voltage is higher than 10 volts. Still, the battery backup line voltage has remained 6 volts or lower for 2 seconds. This issue can be caused by various factors, from an open or shorted line to a failed ECM or PCM. Fortunately, there are solutions to these causes, from inspecting and repairing damaged pipes to replacing the ECM or PCM.
Open or Shorted Battery Backup Line
If the cause of the Mitsubishi P1603 code is an open or shorted battery backup line, the solution is to inspect and repair the line. This process requires a skilled technician to identify and fix any breaks or shorts in the bar.
Harness Damage or Connector Damage
If the cause of the Mitsubishi P1603 code is a harness or connector damage, then the solution is to replace the damaged harness or connector. This process requires a technician to identify and replace the damaged parts with new ones.
ECM Failed
If the cause of the Mitsubishi P1603 code is an ECM failure, the solution is to replace the ECM. This process requires a technician to replace the faulty ECM with a new one.
PCM Failed
Finally, if the cause of the Mitsubishi P1603 code is a PCM failure, the solution is to replace the PCM. This process requires a technician to replace the faulty PCM with a new one.
Conclusion: Troubleshooting the Mitsubishi P1603 Code
The Mitsubishi P1603 code is a diagnostic trouble code that can indicate a variety of issues with a car’s engine starting sequence. Fortunately, there are solutions to each of these causes, from inspecting and repairing damaged lines to replacing the ECM or PCM. By troubleshooting the issue and taking the necessary steps to fix it, drivers can return to the road and enjoy their vehicles again. When it comes to diagnosing and resolving the Mitsubishi P1603 code, it is essential to seek the help of a qualified technician to ensure the issue is properly addressed.