U0103: Lost Communication With Gear Shift Control Module A
What Does U0103 Mean?
U0103 is a diagnostic trouble code indicating: Lost Communication With Gear Shift Control Module A. This code relates to the network communication system. It has been reported in NHTSA complaints across 6 different vehicle models.
Symptoms of U0103
- ⚠️ Shifting problems
- ⚠️ Vehicle enters limp/reduced power mode
Common Causes
- 🔍 Sensor or control module malfunction
U0103 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"On May 31, 2023, my wife and I were in our Honda ridgeline when attempting to back up into a parking spot. We noticed the instrument cluster went dark with only a "P" flashing. There were no alarms or indications of any fault. We shut down the truck. After trying to restart there was no instrument c"
— Honda Ridgeline owner, 05/31/2023
"I was sold this car from a dealer and told nothing was wrong with it, 2 days later codes U0002 (CAN communication BUS performance) and U0103 (Loss communication with gear shift module) came on and the car will go into what I believe is limp mode every 10-30 minutes into driving it. I believe the Col"
— Dodge Charger owner, 03/12/2023
"THE DRIVER SIDE BREAK LIGHT AND REVERSE LIGHT HAS HAD TO BE REPLACED TOO FREQUENTLY. NOW THE GEAR SHIFT - DIAG CODE U0103 SEEMS TO CAUSE THE LOSS OF COMMUNICATION OF THE GEAR POSITION. THAT ONLY ALLOWS THE VEHICLE TO ONLY TRAVEL ABOUT 20MPH AND APPROX 3000 RPM , WHICH CAN BE VERY DANGEROUS IF THERE "
— Dodge Nitro owner, 09/16/2018
Source: NHTSA Complaints Database
Most Reported Vehicles for U0103
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | DODGE CHARGER | |
| 2 | HONDA RIDGELINE | |
| 3 | DODGE NITRO | |
| 4 | JEEP CHEROKEE | |
| 5 | VOLKSWAGEN GOLF | |
| 6 | MERCEDES-BENZ C-CLASS |
U0103 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.