Skip to content
Tahoe / Yukon Service Manual

DTC B1A50

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC B1A50 Automatic Transmission Control Indicator For symptom byte information, refer to Symptom Byte List. Circuit/System Description The indicator has a series of LEDs that show in which range the transmission is. The device is controlled over a serial data bus by the body control module. For an overview of the component/system, refer to: Instrument Cluster Description and Operation Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Conditions for Setting the DTC K9 Body Control Module Detected Transmission Range Indicator = Internal Malfunction Actions Taken When the DTC Sets No additional actions taken Conditions for Clearing the DTC The conditions for setting the DTC no longer exist. Reference Information Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC B1A50 is not set. ⇒ If the DTC is set Replace the component: Transmission Range Indicator ⇓ If the DTC is not set
  3. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Displays and Gauges Component Replacement Reference