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DTC B1173: Gauge Control Module Lost Communication with TPMS Control Unit (TPMS Message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF, and then back ON (II).
  3. Check for DTCs with the HDS.

    Is DTC B11 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure, the F-CAN communication line is OK at this time. Check for DTCs in the ECM/PCM and the TPMS control unit with the HDS. If F-CAN DTCs are present, check for a loose TPMS ground or poor connections at the TPMS control unit or gauge control module. If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system, then clear all DTCs.
  4. Check for DTCs in the ECM/PCM or TPMS with the HDS.

    Are any DTCs indicated? 

    1. YES  - Go to the ECM/PCM or TPMS indicated DTCs troubleshooting.
    2. NO  - Go to step 5.
  5. Do the GAUGE CONTROL MODULE INPUT TEST .

    Are all inputs OK? 

    1. YES  - Go to step 6.
    2. NO  - Repair the faulty input, then recheck the DTCs.
  6. Substitute a known-good gauge control module.
  7. Clear the DTCs with the HDS.
  8. Turn the ignition switch OFF, and then back ON (II).
  9. Check for DTCs with the HDS.

    Is DTC B1773 indicated? 

    1. YES  - Recheck PCM for DTCs, then recheck the TPMS control unit for DTCs.
    2. NO  - The original gauge control module is faulty; replace it (see GAUGE CONTROL MODULE REPLACEMENT ).
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