U1119 Lost FCM Message

U1119  code - The transmission control module (TCM) receives information from the engine, antilock brake system, and the electronic gear shift control module over the Can C bus. The Can C bus is a high speed communication bus that allows real time control capability between various controllers. Most messages are sent every 20 mSec, this means critical information can be shared between multiple controllers almost instantaneously. The Can C bus is a two wire bus with a Can (+) and a (-) circuit. To reduce the potential of radio and other electrical noise interference, the Can bus circuit wiring is manufactured using a twisted pair configuration within the electrical wiring harness. Set conditionthis DTC the DTC will set if a valid can id was not received in the required time from the FCM.

Possible Causes U1119  code:

- Transmission control module (TCM)

Diagnostic test U1119  code

Step 1. Check the TIPM for Can C Bus Communication DTCs

With the scan tool, read TIPM DTCs.

Yes, refer to totally integrated power (TIPM) diagnosis an testing, perform the diagnostic procedure for U0001 Can C Bus first if it is present. Perform NAG1 Transmission Verification Test.

No, go to step 2.

Step 2. Check if the DTC is Current

Note : When the transmission control module (TCM) detects and stores a DTC, the TCM also stores the vehicles operating conditions under which the DTC originally set. This information is located in the scan tool under environmental data. Before erasing any stored DTCs, record any available data to assist in duplicating the conditions in which the dtc originally set. 

Ignition on, engine not running. With the scan tool, erase transmission DTCs. Using the environmental data recorded earlier, try to duplicate the conditions in which the DTC originally set. It may be necessary to test drive the vehicle. With the scan tool, read transmission DTCs.

Did the DTC U1119 Lost TIPM Message reset ?

Yes, using the schematics as a guide, check the transmission control module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the service information. Perform NAG1 Transmission Verification Test.

No go to step 3.

Step 3. Intermittent wiring and connectors

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for any possible open or shorted circuits. Check for any service information tune-ups or technical service bulletins that may apply.

Were there any problems found ? 

Yes, repair as necessary. Perform NAG1 Transmission Verification Test.

No, test complete.

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