Powertrain Control Module (PCM)

U1601-ECU APPLICATION SOFTWARE CODE 1 MISSING OR CORRUPTED
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation

If the Powertrain Control Module (PCM) does not have a calibration installed, or has an unapproved calibration installed then the PCM will be in a ROM boot state. The PCM will have power but no approved software to allow the vehicle to be started and driven. No further diagnostics of the PCM will be available at this time. This code will be cleared when the PCM has the correct approved calibration installed.

- When Monitored:
Ignition on.

- Set Condition:
The Powertrain Control Module (PCM) is in ROM boot mode.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. NEW POWERTRAIN CONTROL MODULE
1. If the PCM was replaced and not programmed this DTC will set.
2. With a scan tool clear DTCs.

Has the PCM been replaced on this vehicle?

Yes

- Program the Powertrain Control Module (PCM) with the correct software.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 2

2. DOWNLOAD FAILED
1. If the vehicle lost battery power or the scan tool was disconnected during programming, this DTC will set.

Was a software download interrupted during the download process?

Yes

- Reprogram the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 3

3. UNAPPROVED SOFTWARE INSTALLED
1. Unapproved software programmed into the Powertrain Control Module is not a warrantable repair.

If tests one and two do not apply, the vehicle has been programmed with unapproved software.

Yes

- Reprogram the Powertrain Control Module with the correct software.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.