What Does U059F Mean?
The engine control module is receiving corrupted or implausible data from NOX sensor B in the exhaust system. This affects selective catalytic reduction (SCR) system operation and emissions monitoring on diesel engines.
Common Causes
45%
Failed or contaminated NOX sensor B
30%
Damaged wiring harness or corroded connector between NOX sensor B and ECM
15%
Poor ground connection for NOX sensor circuit
10%
ECM software corruption or calibration issue
Diagnostic Steps
1
Step 1: Visually inspect NOX sensor B connector and wiring for damage, corrosion, or contamination
2
Step 2: Monitor NOX sensor B data stream in live data and compare values to sensor A and expected parameters
3
Step 3: Perform resistance and voltage tests on NOX sensor B heater circuit and signal wires per service manual specifications
4
Step 4: Check CAN bus communication integrity between NOX sensor and ECM using oscilloscope or advanced scan tool
5
Step 5: If all circuits test normal, replace NOX sensor B and retest; update ECM software if issue persists
Estimated Repair Cost
$400 - $1,200
Parts + labor, varies by vehicle and location
The engine control module is receiving corrupted or implausible data from NOX sensor B in the exhaust system. This affects selective catalytic reduction (SCR) system operation and emissions monitoring on diesel engines.
The most common cause of U059F (Invalid Data Received From NOX Sensor "B") is: Failed or contaminated NOX sensor B
Typical repair costs for U059F range from $400 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to drive but may enter reduced power mode. Emissions system will not function properly, potentially causing failed emissions testing and environmental harm.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U059F 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
Emissions Control System (SCR/DEF)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
