Aston Martin diagnostic trouble code
P0863: Serial Backup Line Time Out (PRND)
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: Non-MIL
What Aston Martin code P0863 means
Serial Backup Line Time Out (PRND)
DB9 preliminary diagnostic manual · section 2-198
Manufacturer fault-analysis procedure
Test sequence and decision path
1. Connect the WDS and confirm that P0863 is
logged. Clear the logged fault code.
2. Check continuity from transmission connector
C0932-1 to Primary PCM connector C0635-3.
If continuity is poor, service the circuit as necessary. Reconnect all components and run a KOEO
test to ensure that the problem is resolved.
If continuity is good, Check for votage and then
resistance from C0635-3 to ground.
If any short to supply or to ground is detected,
service the circuit as necessary and run a KOEO
test to ensure that the problem is resolved.
If P0863 is logged again, consult Aston Martin
Technical Support.
Open the corresponding manual page for wiring diagrams and figures
logged. Clear the logged fault code.
2. Check continuity from transmission connector
C0932-1 to Primary PCM connector C0635-3.
If continuity is poor, service the circuit as necessary. Reconnect all components and run a KOEO
test to ensure that the problem is resolved.
If continuity is good, Check for votage and then
resistance from C0635-3 to ground.
If any short to supply or to ground is detected,
service the circuit as necessary and run a KOEO
test to ensure that the problem is resolved.
If P0863 is logged again, consult Aston Martin
Technical Support.