u0103 lost communication with gear shift control module a

OBD2 Code: U0103

Description: Lost Communication with Gear Shift Control Module A

Definition: This code indicates that the vehicle’s Engine Control Module (ECM) or other control modules have lost communication with the Gear Shift Control Module A. This can be due to issues such as wiring problems, faulty connectors, or a malfunctioning module.

: Lost communication with gear shift control module
Severity: Moderate

Common Causes

Common causes of the OBD2 code u0103 include:

• Faulty gear shift control module
• Wiring issues such as damaged or corroded wires
• Poor electrical connection between the control module and other components
• Software issues within the control module

 

Common Misdiagnosis

Lost Communication With Gear Shift Control Module A
Common Misdiagnosis: Faulty gear shift control module when the issue may be due to wiring problems or a faulty CAN bus connection.

 

Common Diagnostic Steps

OBD2 Code: U0103
Description: Lost Communication with Gear Shift Control Module A

• Check for any other stored trouble codes that might indicate a related issue.
• Inspect the wiring and connectors between the gear shift control module and the CAN bus network for damage or corrosion.
• Verify that the gear shift control module is receiving power and ground signals.
• Use a scan tool to check for communication on the CAN bus network. Look for open or short circuits in the communication lines.
• If equipped, perform a continuity test on the CAN high and low circuits between modules.
• Consult vehicle-specific repair information to determine if there are any technical service bulletins (TSBs) related to this code.
• If all tests pass, consider replacing the gear shift control module after confirming it is faulty through diagnostic procedures.