U2008: Audio Phone Module No Communication
The U2008 code indicates that the Audio Phone Module (also known as the Hands-Free Module) is not communicating on the vehicle's Controller Area Network (CAN) bus. This fault is logged when the master module (often the APIM or GWM) detects that the phone module is not sending periodic messages or fails to respond to a direct poll within a calibrated time period.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or internally damaged audio phone (hands-free) module
- Open circuit, short to ground, or short to battery on the CAN bus (HS-CAN or MS-CAN) to the module
- Loose, corroded, or retracted terminals in the module connector
- Loss of power (B+) or ground to the phone module
- Software error or calibration corruption in the module
- Network conflict caused by another module monopolizing the bus (babbling node)
3. Symptoms You Will Notice
- Hands-free calling may be inoperative
- Audio system may not recognize phone connection
- Possible loss of other audio or telematics functions
4. Step-by-Step Diagnosis
Scan for all codes and note any related U-codes or network codes
Check for power and ground at the phone module connector
Inspect the CAN bus wiring and connectors for damage, corrosion, or shorts
Perform a network test to see if the module responds to a direct command
If wiring and power are good, suspect a faulty module or software issue
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but hands-free calling and related audio features will be unavailable. The issue is moderate and should be diagnosed soon to prevent potential network problems.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Repair costs vary: a loose connector may be free to fix, while replacing the phone module can range from $300 to $800 including labor.