What Does U011C Mean?
The PCM has lost communication with rocker arm control module B. This is the second module managing variable valve timing or cylinder deactivation on the opposite bank or additional cylinders.
Common Causes
35%
Faulty rocker arm control module B
30%
Damaged wiring harness or connectors to module B
20%
CAN bus communication network fault
10%
Power supply or ground circuit problem to module B
5%
PCM software issue or PCM malfunction
Diagnostic Steps
1
Step 1: Check battery voltage and inspect engine ground connections thoroughly
2
Step 2: Locate rocker arm control module B (usually opposite bank from module A) and inspect for oil contamination in connectors
3
Step 3: Verify power and ground at module B connector using multimeter and compare to specifications
4
Step 4: Test CAN bus communication lines at module B for proper voltage and signal activity
5
Step 5: Replace rocker arm control module B if all circuits are functional but communication remains lost
Estimated Repair Cost
$250 - $1,000
Parts + labor, varies by vehicle and location
The PCM has lost communication with rocker arm control module B. This is the second module managing variable valve timing or cylinder deactivation on the opposite bank or additional cylinders.
The most common cause of U011C (Lost Communication With Rocker Arm Control Module "B") is: Faulty rocker arm control module B
Typical repair costs for U011C range from $250 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine performance will be affected with possible rough running and reduced power. Variable valve timing will not function properly. Vehicle is drivable but should be repaired soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U011C 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
Engine Valvetrain / Variable Valve Timing
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
