Safe to drive - B157E only affects Bluetooth and phone features, not the engine or brakes. B157E is a Toyota infotainment code meaning the head unit no longer detects its Bluetooth antenna. On 2014-era Toyota/Entune systems the Bluetooth antenna is built into the radio and display receiver and links to the extension module by a short cord, so B157E usually means a loose or damaged antenna cord, a faulty extension module, or a failed receiver. It affects phone and Bluetooth features only - not driving.
What B157E means
The multimedia system monitors the connection to its Bluetooth antenna and stores B157E when that antenna reads as not connected. On these Toyotas the Bluetooth antenna is integrated into the radio and display receiver assembly and is joined to the extension module by an antenna cord. A break anywhere in that path - the cord, the extension module, or the receiver's built-in antenna - triggers the code and knocks out hands-free calling and Bluetooth audio.
Symptoms
- Bluetooth won't pair, won't connect, or drops calls
- Hands-free / phone audio problems or weak Bluetooth range
- B157E stored in the navigation / multimedia module
- No effect on the engine, warning lights, or driving
- Often appears after head-unit or trim work that disturbed a connector
Common causes
- Bluetooth antenna cord loose or unseated at the extension module
- Damaged, pinched or broken antenna cord
- Faulty extension module
- Failed radio and display receiver assembly (which contains the antenna)
- Recent multimedia or dash work that disturbed the antenna connection
Severity & driving advice
Severity: Low — Comfort and connectivity only - safe to drive.
Can I drive? Safe to drive - B157E only affects Bluetooth and phone features, not the engine or brakes.
Diagnostic approach
- Confirm and clear the code — Verify B157E in the multimedia module, clear it, and recheck to see whether it returns.
- Check the antenna cord connection — Access the head unit and confirm the Bluetooth antenna cord is fully seated at the extension module; reseat it if loose.
- Inspect the cord — Look for pinching, chafing or breaks along the antenna cord and repair or replace if damaged.
- Replace the radio and display receiver — If the connection is good but B157E returns, the antenna is built into the receiver, so replace the radio and display receiver assembly.
- Replace the extension module — If the code still returns after replacing the receiver, replace the extension module, then clear codes and re-test pairing.
Estimated repair costs
Typical US repair costs (parts & labour) for the faults behind B157E. These are national-average estimates, not a quote— your actual price varies by region, shop labour rate, and your vehicle’s make, model and year. Figures reviewed 2026.
| Repair | Estimated cost (USD) |
|---|---|
| Diagnosis (scan and inspection) | $75–$150 |
| Reseat or replace antenna cord | $50–$200 |
| Extension module | $150–$400 |
| Radio and display receiver assembly | $500–$1,500 |
Make & model notes
Toyota: Seen on 2014 Toyota models with the Entune radio and display receiver - including Avalon, Camry and Prius. The Bluetooth antenna is built into the receiver and connects to the extension module by a cord, so start diagnosis at that cord and connector. On satellite-radio cars, re-register the XM/SDARS ID after replacing the receiver.
FAQ
Can I drive with B157E?
Yes - it only affects Bluetooth and phone connectivity. There is no impact on the engine, brakes or safety systems.
Why did my Bluetooth stop working?
The head unit can no longer detect its Bluetooth antenna, so hands-free calling and Bluetooth audio stop until the connection is restored.
Do I have to replace the whole radio?
Not necessarily. Check the antenna cord and its connection to the extension module first - many B157E cases are just a loose or damaged cord.
Does replacing the radio need any setup?
On vehicles with satellite radio, the XM/SDARS radio ID must be re-registered after the radio and display receiver is replaced.