What Does U010A Mean?
The PCM/ECM has lost communication with the primary EGR control module over the vehicle's CAN bus network. This indicates a disruption in data exchange affecting emissions control system monitoring and operation.
Common Causes
35%
Faulty EGR control module internal circuit failure
30%
Damaged or corroded wiring/connectors in EGR module circuit
20%
CAN bus network fault affecting multiple modules
10%
Loss of power or ground to EGR control module
5%
PCM/ECM internal communication fault
Diagnostic Steps
1
Step 1: Verify power and ground supply to EGR control module A using multimeter
2
Step 2: Inspect wiring harness and connectors between PCM and EGR module for damage, corrosion, or loose connections
3
Step 3: Check CAN bus communication signals (CAN High/Low) at EGR module connector with oscilloscope or multimeter
4
Step 4: Test EGR control module by substitution if available, or verify module programming is current
5
Step 5: Check for additional U-codes indicating broader network issues requiring CAN bus circuit diagnosis
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The PCM/ECM has lost communication with the primary EGR control module over the vehicle's CAN bus network. This indicates a disruption in data exchange affecting emissions control system monitoring and operation.
The most common cause of U010A (Lost Communication With Exhaust Gas Recirculation Control Module "A") is: Faulty EGR control module internal circuit failure
Typical repair costs for U010A range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains drivable but emissions performance is compromised. May cause reduced fuel economy and potential catalytic converter damage if left unrepaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U010A 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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