DTC Troubleshooting: B1168
DTC B1168:
 Gauge Control Module (Tach) Lost Communication with ECM (ENG Message)
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs with the HDS.
Is DTC B1168 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the gauge control module (tach) is OK at this time.■
  1. Check for Fuel and Emission system DTCs with the HDS.
Are any DTCs indicated?
YES -
Go to the indicated DTCs troubleshooting, then recheck.■
NO -
Go to Step 6 .
  1. Turn the ignition switch OFF.
  1. Disconnect the gauge control module (tach) 36P connector.
  1. Jump the SCS with the HDS.
  1. Connect the gauge control module (tach) 36P connector No. 1 and No. 19 terminals and body ground with jumper wires.
  1. Check for continuity between the ECM connector A (44P) terminals No. 36 and No. 37 and body ground individually.
Are there continuity?
YES -
Update the ECM if it does not have the latest software, or substitute a known-good ECM , and recheck. If DTC B1168 is indicated again, replace the gauge control module (tach).■
NO -
Repair an open in the wire.■