Aston Martin diagnostic trouble code

P0850: Parklock Sensor Fault.

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 P0850 means

Parklock Sensor Fault.

DB9 preliminary diagnostic manual · section 2-194

Manufacturer fault-analysis procedure

Test sequence and decision path

1. Connect the WDS and confirm that P0850 is
logged. Clear the logged fault code.

2. Set datalogger to monitor the parklock status signal. Switch on the ignition. Select and deselect
Park several times. The PARKST signal should follow the changes in Park status.
If the signal does correctly follow changes in Park
status, repeat the test again to ensure that the
problem is no longer present.
If the signal does not change status, go to step 3.

3. Check the emergency park release lever is in the
released position. Also check the emergency
release cable for jamming, stiff operation, etc.
If the emergency park release system operation is
suspect, Service the lever and cable as necessary.
Clear the P0850 code and retest to ensure that the
problem is resolved.
If the emergency park release system is operating
correctly, change the mechatronic unit. Clear the
P0850 code and retest to ensure that the problem
is resolved.
If the P0850 code is logged agan, contact Aston
Martin Technical Support.
Open the corresponding manual page for wiring diagrams and figures