U0103
Lost Communication With Gear Shift Control Module A
U0103 is an OBD-II diagnostic trouble code meaning: Lost Communication With Gear Shift Control Module A. Common causes: open or short circuit in the can bus circuit, shift module power problems. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- The car may not shift gears
- It is possible to switch to emergency mode of operation of the gearbox
- The instrument panel may display incorrect selector positions
- Loss of power or acceleration problems
Causes
- Open or short circuit in the CAN bus circuit
- Shift Module Power Problems
- Malfunction of the gear shift module itself
- Poor contact in wiring connectors
- Problems with the main ECU
How to Fix
- Check fuses associated with the shift module
- Inspect the wiring harness and connectors for damage.
- Check the module supply voltage
- Scan the CAN bus for communication errors
- If necessary, replace the gear shift module
Related codes
Error U0103 by Vehicle Brand
FAQ
What does the U0103 code mean?
U0103 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Gear Shift Control Module A
What causes a U0103 error code?
The most common causes of U0103 include: Open or short circuit in the CAN bus circuit; Shift Module Power Problems; Malfunction of the gear shift module itself; Poor contact in wiring connectors.
How do I fix a U0103 diagnostic trouble code?
To fix U0103: Check fuses associated with the shift module. Inspect the wiring harness and connectors for damage.. Check the module supply voltage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0103?
Limited driving only, diagnose soon
How much does it cost to fix U0103?
The estimated repair cost for U0103 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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