DTC po719 keeps showing up. What are the most common reasons this code appears? What problems occur? And what are the symptoms of this code. Any help!!!!!! Got an 04 with an A4 tranny.

 

Circuit Description

The brake switch indicates brake pedal status to the powertrain control module (PCM). The brake switch is a normally-closed switch that supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. If the PCM receives a zero voltage signal at the brake switch input, and the torque converter clutch (TCC) is engaged, the PCM de-energizes the TCC solenoid valve. The PCM disregards the brake switch input for TCC scheduling if there is a brake switch circuit fault (Refer to Diagnostic Aids).

When the PCM detects an open brake switch circuit (0 volts, low input) during accelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.

Conditions for Running the DTC

No VSS assembly DTCs P0502 or P0503.
The ignition is ON.

Conditions for Setting the DTC

The PCM detects an open brake switch or circuit (0 volts) for 15 minutes without changing for 2 seconds, and the following events occur seven times:

The vehicle speed is less than 8 km/h (5 mph);
then the vehicle speed is 8-32 km/h (5-20 mph) for 4 seconds;
then the vehicle speed is greater than 32 km/h (20 mph) for 6 seconds.

Action Taken When the DTC Sets

The PCM does not illuminate the malfunction indicator lamp (MIL).
The PCM disregards the brake switch input for TCC scheduling.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
The PCM stores DTC P0719 in PCM history.

Conditions for Clearing the DTC

A scan tool can clear the DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids

Inspect the connectors at the PCM, the brake switch and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent and Poor Connections in Wiring Systems.
Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems.
If the PCM detects a brake switch fault, then the brake switch input is disregarded for TCC scheduling. The PCM then uses throttle position and vehicle speed to determine TCC application and release. Use of these inputs may result in a noticeable harsh apply or abrupt release of the TCC.
Ask about the customer's driving habits. Ask about unusual driving conditions (e.g. stop and go, expressway, etc.).
Inspect the brake switch for proper mounting and operation.
Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0719.

 

Recieved P0719 code today. At same time I have lost 3rd and 4th gear. Could this be related or a coincidence and looking at transmission rebuild?

 

As mentioned previously the brake light circuit affects the TQ converter lockup
Whether the brake DTC code is in fact real or even a false code-- when they appear they will prevent the TCC from locking up. Or even worse the TCC will randomly lock/unlock.
If driven too long this way the trans fluid will overheat badly !!! and YES most likely will self distruct. (Sorry!)

 

Thank you for the clarification. Transmission is gone!! I have it at Franks's Vettes in Houston for a rebuild now. I will be sure they are aware of this code info.