Aston Martin diagnostic trouble code

P1797: CAN TCM/ECM Position Circuit Malfunction

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 P1797 means

CAN TCM/ECM Position Circuit Malfunction

DB9 preliminary diagnostic manual · section 2-282

Manufacturer fault-analysis procedure

Manual fault definition

P1797 CAN Timeout, lost contact with the Engine Management System

Test sequence and decision path

1. Connect the WDS and confirm that P1797 is
logged.

2. Analyse the problem using the High Speed CAN
Bus fault analysis procedure in the introduction
section of this manual.
Open the corresponding manual page for wiring diagrams and figures

Supporting owner context

What owners have reported

One DB9 report followed throttle-body work and a disturbed connection. Include recent work and connector checks in the history before replacing parts.

This is supporting owner-reported context, not a replacement for the manufacturer procedure or a diagnosis of every vehicle.

Read the related owner discussion