Lost Communication with Alternator/Generator Module
2008-2008 Mazda Tribute 2.5L I4
The 2008 Mazda Tribute is equipped with a 2.5L inline-4 engine. Below you'll find detailed u0118 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Cannot communicate with the smart alternator or integrated starter-generator module.
Symptoms
- Battery warning light
- Charging system malfunction
- Battery not charging
- Voltage fluctuations
- Stop-start system disabled
Common Causes
- Smart alternator failure
- CAN bus wiring to alternator
- LIN bus issue
- Alternator connector corrosion
- Voltage regulator failure
Diagnostic Steps
- Check alternator fuse
- Test alternator output voltage
- Check CAN/LIN wiring to alternator
- Inspect alternator connector
- Test alternator with direct command
Repair Notes
Modern smart alternators communicate on CAN or LIN bus. Check wiring and connector at alternator.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0118 on Other Vehicles
Common Questions
What does code U0118 mean on a 2008-2008 Mazda Tribute?
U0118 stands for "Lost Communication with Alternator/Generator Module". Cannot communicate with the smart alternator or integrated starter-generator module.
What are the symptoms of U0118 on a Mazda Tribute?
Common symptoms of U0118 include: Battery warning light, Charging system malfunction, Battery not charging, Voltage fluctuations, Stop-start system disabled.
What causes U0118 on a 2008-2008 Mazda Tribute?
Common causes of U0118 include: Smart alternator failure, CAN bus wiring to alternator, LIN bus issue, Alternator connector corrosion, Voltage regulator failure.
Last updated: March 2026