U110B Lost engine coolant message

U110B code

U110B codeThe transmission control module (TCM) received information from the engine, anti-lock brake system, and the electronic gear shift control modules over the CAN C bus. The CAN C bus is a hight speed communication bus that allow 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 instaneously. The CAN C bus is a two wire bus with a CAN(+) and a CAN (-) 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 condition this the DTC will set if a valid CAN ID was not received in the required time from the ECM/PCM.

Possible causes U110B code:

- Transmission control module

Diagnostic test U110B code

Step 1. Check the TIPM for can C bus communication DTCs

With the scan tool, check for TIPM DTCs.

Does the tipm repoert the dtc U0001 can c bus dtc or U0100 lost communication with ecm/pcm ?

Yes, refer to totally integrated power (TIPM) diagnosis and testing for diagnostic procedures and other possible causes. Perform the diagnostic procedure for U0001 can C bus first if it 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 asist 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 U110B lost engine coolant message reset ? 

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

No, go to step 3.

Step 3. Check 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 cheking 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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