LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2006 >> Grand Vitara Base, AWD, Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Brakes - Esp >> Diagnostic Information And Procedure >> DTC U1101: Lost Communication With TCM (Reception Error) >> DTC Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action YES NO
1  Was "Electronic Stability Program Check" performed?  Go to Step 2. Go to ELECTRONIC STABILITY PROGRAM CHECK .
2  DTC check for ESP® 
  1. Check DTC for ESP®.

Is DTC U1101 and DTC U1073 detected together? 		 Go to DTC U1073: CONTROL MODULE COMMUNICATION BUS OFF  for troubleshooting. Go to Step 3.
3  DTC check for TCM 
  1. Check DTC for TCM.

Is DTC U0073 detected? 		 Go to DTC U0073: CONTROL MODULE COMMUNICATION BUS OFF for troubleshooting. Go to Step 4.
4  Check each control module connectors 
  1. Check connection of connectors of all control modules communicating by means of CAN.
  2. Check DTC for ESP®.

Is DTC U1101 detected? 		 Go to Step 5. Check for intermittent trouble referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
5  CAN communication circuit check 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of ESP® control module, TCM and BCM communicating by means of CAN.

Is each CAN communication circuit between ESP® control module, TCM and BCM opened, shorted or high resistance? 		 Repair or replace the CAN communication line. Go to Step 6.
6  DTC check for ESP® 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of all control modules communicating by means of CAN.
  3. Connect connectors to ESP® control module and TCM.
  4. Check DTC for ESP®.

Is DTC U1101 detected? 		 Go to Step 7. Go to Step 8.
7  DTC Check for BCM 
  1. Turn ignition switch to OFF position.
  2. Connect connector to BCM.
  3. Check DTC for BCM.

Is DTC U1101 detected? 		 Check TCM power and ground circuit. If circuit is OK, substitute a known-good TCM and check DTC. Check ESP® power and ground circuit. If circuit is OK, substitute a known-good ESP® hydraulic unit/control module assembly and check DTC.
8  CAN communication circuit check 
  1. Turn ignition switch to OFF position.

Is each CAN communication circuit between disconnected control modules (other than ESP® control module and TCM) opened, shorted or high resistance? 		 Repair or replace the CAN communication line. Go to Step 9.
9  DTC check for ESP® 
  1. Connect connectors of disconnected control modules communicating by means of CAN.
  2. Disconnect each connector.
    • ECM
    • TCM
    • BCM
    • 4WD control module (if equipped)
    • Keyless start control module (if equipped)
    • Steering angle sensor
  3. Check DTC for ESP®.

Is DTC U1101 detected? 		 Check ESP® control module power and ground circuit. If circuits are OK, substitute a known-good ESP® hydraulic unit/control module assembly and check DTC. Check applicable control module power and ground circuit. If circuit is OK, substitute a known-good applicable control module and check DTC.
scientia non olet · About LEMON Manuals