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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 915 (DATA LINK COMMUNICATIONS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U2100: MODULE CAN COMMUNICATION ERRORCONDITIONS FOR CLEARING THE MIL/DTC
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Conditions for Clearing the MIL/DTC

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  • A current DTC Last Test Failed clears when the diagnostic runs and passes after 3 consecutive drive cycles.
  • A current DTC clears and the MIL is turned OFF when the fault is no longer present.
  • A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the fault, or after 40 consecutive drive cycles.
DTC U2100

Step Action Yes No
Schematic Reference: Data Link Connector (DLC) Schematics (A/T)  or Data Link Connector (DLC) Schematics (M/T) 
Connector End View Reference: Master Electrical Component List in Wiring Systems.
1 Did you perform the Diagnostic System Check for the system exhibiting the symptom? Go to Step 2  Go to Control Module References in Body Control System for the applicable Diagnostic System Check
2
  1. Turn OFF the ignition.
  2. Disconnect the BCM, ECM, EBCM, and TCM connectors.
  3. Test both the CAN high and low circuits for the following conditions:
    • A short to ground
    • A short to voltage
    • A short to each other
Turn ON the ignition, with the engine OFF when you test for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 Go to Step 5  Go to Step 3 
3
  1. Using the scan tool, clear the DTCs.
  2. Turn OFF the ignition.
  3. Reconnect each module one at a time, starting with the TCM, then the BCM, the EBCM, and finally the ECM.
  4. After each module is connected, check for U2100 in the ECM and EBCM.
Does DTC U2100 reset after reconnecting each module one at a time?		 Go to Step 5  Go to Step 4 
4
IMPORTANT: Perform the programming or set up procedure for the replaced control module if required.
Replace the module that resets U2100. Refer to Control Module References in Body Control System for the applicable replacement procedure.Did you complete the replacement?		 Go to Step 5  -
5
  1. Reconnect all modules not already connected.
  2. Use the scan tool in order to clear the DTCs.
  3. Turn OFF the ignition switch.
  4. Wait at least 10 seconds.
  5. Turn the ignition ON, with the engine OFF.
  6. Retrieve DTCs from the ECM and EBCM.
Does the DTC reset ?		 Go to Step 2  System OK
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