What Does U010B Mean?
Communication has been lost between the PCM/ECM and the secondary EGR control module B over the vehicle network. This affects dual EGR systems found in some heavy-duty or performance applications.
Common Causes
35%
Failed EGR control module B internal electronics
30%
Wiring harness damage or connector corrosion to module B
20%
CAN bus network fault or termination resistance issue
10%
Power supply or ground circuit failure to module B
5%
Software/firmware incompatibility or corruption
Diagnostic Steps
1
Step 1: Check power and ground circuits at EGR control module B connector with multimeter
2
Step 2: Inspect all wiring and connectors specific to module B for physical damage or corrosion
3
Step 3: Measure CAN High and CAN Low voltage signals at module B connector (should be ~2.5V at rest, oscillating when active)
4
Step 4: Compare module A and B circuits to isolate whether issue is module-specific or network-wide
5
Step 5: Attempt module reprogramming/reflashing before replacement if communication can be temporarily established
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
Communication has been lost between the PCM/ECM and the secondary EGR control module B over the vehicle network. This affects dual EGR systems found in some heavy-duty or performance applications.
The most common cause of U010B (Lost Communication With Exhaust Gas Recirculation Control Module "B") is: Failed EGR control module B internal electronics
Typical repair costs for U010B range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can operate but with reduced emissions control efficiency. Prolonged operation may damage exhaust components and fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U010B to identify the root cause.
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Quick Info
Category
Network
System
Emissions Control / Network Communication
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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