U0067: CAN Bus E Low Line Fault
The U0067 code indicates a fault in the vehicle's communication bus E, specifically on the low signal line. According to SAE J2012, codes U0000-U007F relate to data bus communication issues in the CAN network. Bus E is an auxiliary communication bus used for specific modules depending on the manufacturer's network architecture. The low line is part of the CAN bus differential pair along with the high line; when this line fails, communication between electronic modules on that bus is disrupted.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Low line wiring of bus E shorted to ground
- Low line wiring of bus E shorted to the high line or power
- CAN bus termination resistor out of specification or damaged
- Bus E connector or junction with corrosion, oxidation, or mechanical damage
- Internal fault in a controller module on bus E affecting the low line
- External electromagnetic interference affecting signal integrity
3. Symptoms You Will Notice
- Check Engine Light or other warning lights illuminated
- Multiple electronic modules not communicating or malfunctioning
4. Step-by-Step Diagnosis
Scan for all stored codes and note which modules are not communicating
Inspect the bus E wiring and connectors for damage, corrosion, or shorts
Measure resistance across the CAN bus termination resistors (should be ~60 ohms)
Check for shorts between low and high lines or to ground/power using a multimeter
If wiring is intact, isolate modules one by one to find the faulty controller
5. Frequently Asked Questions
Is it safe to drive?▼
Driving with this code is not recommended as it can cause unpredictable behavior of critical systems. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400 for wiring repairs or up to $800+ if a module replacement is needed.