EN / RU / ES / FR / DE

OBDII/EOBD diagnostics trouble codes definition

If your car is equipped with OBD-II or EOBD, you can access over 5,000 generic OBD-II diagnostic trouble codes (DTCs). These codes cover various vehicle systems, including Powertrain (P0XXX, P2XXX, P34XX), Body (B0XXX), Chassis (C0XXX), and Network/Communication (U0XXX, U2XXX, U3XXX). Additionally, there are more than 13,500 manufacturer-specific OBD-II codes available for diagnosing issues unique to different car brands and models. Make sure you're equipped with the right tools to understand and resolve these trouble codes to keep your vehicle running smoothly.

By using these OBD-II codes, you can effectively diagnose issues related to engine performance, safety features, suspension, and more.

Supported manufacturers with specific OBD2 codes:

Enter code:
+
P
-
+
0
-
+
0
-
+
0
-
+
0
-


Detailed Description of Error U0103

Error U0103 is an OBDII diagnostic trouble code that indicates a loss of communication with the Gear Shift Control Module ''A''. This module is responsible for controlling the vehicle''s transmission and gear shifts. When the module fails to communicate, it can cause issues with the vehicle''s shifting, leading to erratic or unpredictable behavior. This code is often accompanied by other transmission-related codes, such as P0700, P0701, P0702, etc., which indicate specific faults within the transmission system.

Possible Causes of Error U0103

There are several possible causes for the U0103 error code, including:

  • Corrosion or damage to the wiring harness between the Gear Shift Control Module ''A'' and the vehicle''s computer.
  • A faulty Gear Shift Control Module ''A'' that is unable to communicate properly with the vehicle''s computer.
  • Low battery voltage, which can cause the module to malfunction or fail to communicate.
  • A faulty vehicle computer (ECU) that is unable to communicate with the Gear Shift Control Module ''A''.
  • Other electrical issues within the vehicle, such as a short circuit or faulty relay, that can disrupt communication between the module and the computer.

Possible Fixes for Error U0103

To diagnose and fix the U0103 error code, follow these steps:

  1. Check the wiring harness for any signs of corrosion or damage. Repair or replace the wiring as necessary.
  2. Use a scan tool to monitor the communication between the Gear Shift Control Module ''A'' and the vehicle''s computer. If the module is not communicating, it may need to be replaced.
  3. Check the battery voltage to ensure it is within the recommended specifications. If the voltage is low, charge the battery or replace it if necessary.
  4. If the vehicle''s computer (ECU) is suspected to be faulty, it may need to be reprogrammed or replaced.
  5. Check for any other electrical issues within the vehicle, such as a short circuit or faulty relay, and address them as necessary.

Chat