What Does U049A Mean?
The vehicle's control module network is receiving corrupted or implausible data from Door Control Module A (typically driver door). This indicates a communication error where the module is responding but transmitting invalid information.
Common Causes
35%
Faulty door control module with internal corruption or software glitch
25%
Corroded or damaged connector pins at door control module harness
20%
CAN bus wiring damage or short circuit in door harness
12%
Low voltage supply to door control module causing erratic behavior
8%
Module software version mismatch or requires programming update
Diagnostic Steps
1
Step 1: Check battery voltage and verify door control module is receiving proper voltage (typically 9-16V) at connector
2
Step 2: Inspect door module connector for corrosion, bent pins, or water intrusion; clean and repair as needed
3
Step 3: Use scan tool bidirectional controls to command door functions and monitor live data from Module A for erratic values
4
Step 4: Check CAN bus termination resistance (should be approximately 60 ohms) between CAN High and CAN Low pins
5
Step 5: If wiring and voltage are good, attempt module reprogramming/initialization; replace door control module if invalid data persists
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The vehicle's control module network is receiving corrupted or implausible data from Door Control Module A (typically driver door). This indicates a communication error where the module is responding but transmitting invalid information.
The most common cause of U049A (Invalid Data Received From "Door Control Module A") is: Faulty door control module with internal corruption or software glitch
Typical repair costs for U049A range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Door locks, windows, or mirrors may operate erratically or not at all. Vehicle is safe to drive but security and convenience features may be compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U049A to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Network
System
Body Control Network / Door Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
