Aston Martin diagnostic trouble code

P1603: Transmission EPROM Checksum Error

Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.

Code family
Powertrain
Vehicle system
Transmission
Manual coverage
DB9
Warning-lamp status
DB9: MIL

What Aston Martin code P1603 means

Transmission EPROM Checksum Error

DB9 preliminary diagnostic manual · section 2-246

Manufacturer fault-analysis procedure

Manual fault definition

P1603 - TCM checksum incorrect.

Test sequence and decision path

1. Connect the WDS and confirm that P1603 is
logged.

2. Clear the P1603 code. Switch the ignition off and
then on again.

3. If P1603 is not logged again, repeat the ignition
off/on test several times to ensure that the problem is resolved.
If P1603 is logged again, reflash the TCM and
retest toensure that the problem is resolved.
If P1603 is logged again, consult Aston Martin
Technical Support.
Open the corresponding manual page for wiring diagrams and figures