Vag Com Fault Code- 18034 P1626

[samyuen]

Found this fault code on Gal 03, 1.9 TDi 6 Speed Manual. Do anyone know how to fix this?

 

18034- Powertrain Data Bus: Missing Message from TCU P1626 -35-00--

[Mirez]

Found this fault code on Gal 03, 1.9 TDi 6 Speed Manual. Do anyone know how to fix this?

 

18034- Powertrain Data Bus: Missing Message from TCU P1626 -35-00--

 

Copy and Pasted from the DTC list:

 

DTC P1626 Theft Deterrent Fuel Enable Signal Lost

Circuit Description

The Theft Control Unit (TCU) system is incorporated within the body control module (BCM). The powertrain control module (PCM) monitors the state of health serial data message from the Theft Control Unit (TCU) to ensure that the PCM to TCU communications is established. If the PCM detects a loss of the state of health message while the engine is running, DTC P1626 will set. DTC P1626 can cause a no-start condition or normal operation depending on when the loss of Theft Deterrent system communication was detected. The engine will continue to start and run if the condition that set DTC P1626 occurred after the PCM received a valid theft deterrent password from the BCM and already allowed fuel during the ignition cycle. The engine will start and immediately stall if the condition that set DTC P1626 occurred before the PCM received a valid theft deterrent password. With this condition present, the PCM will inhibit fuel delivery and disable the starter until a valid theft deterrent password is detected.

 

Conditions for Setting the DTC

The PCM has detected a loss of the state of health serial data message from the Theft Deterrent system.

 

Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 40 malfunction free warm-up cycles.

The PCM receives a clear code command from the scan tool / Diagnostic Aids

[samyuen]

Thank you so much for replying, tried to clear the code wtih vag com but it won't clear. How can the false be traced? The car runs normally. Can resetting the ECU, ie: switching the engine off while driving can trigger the code?

[Mirez]

Thank you so much for replying, tried to clear the code wtih vag com but it won't clear. How can the false be traced? The car runs normally. Can resetting the ECU, ie: switching the engine off while driving can trigger the code?

 

I can't advise on how to trace it as I don't really understand what module the TCU is on the Gal! How are you resetting the code? Maybe try with just ignition or with the engine running - see what occurs.

 

I suspect that turning the engine off whilst at speed could log the code (on a side note if you have and more rev's then tickover when you do that its a very quick way to kill a turbo!) as it seems to be related to the fuel pump signals.

 

...Actually it seems to be linked to nearly all the modules in the car - do a full scan with VagCom of every module and see if there are any other codes stored especially in the cluster, ABS and locking modules.

Edited January 28, 2010 by Mirez