B2102: Radio Antenna Short to Ground

📅 Last reviewed: July 2026

What does the B2102 code mean?

The B2102 code indicates that the Body Control Module (BCM) or radio module has detected a short to ground in the radio antenna or Remote Keyless Entry (RKE) antenna circuit. This prevents AM/FM radio reception and may also affect remote keyless entry functionality.

Medium

Severity

Variable

Typical Cost

Medium

Frequency

1. Commonly Affected Makes

FordLincolnMercury

2. Most Common Causes

🔧
Antenna circuit wiring chafed or pinched against the chassis
🔧
Corroded or bent terminals in the antenna or module connector (BCM/Radio)
🔧
Internal short circuit in the antenna base (mast or shark fin)
🔧
Faulty Body Control Module (BCM) or radio unit

3. Symptoms You Will Notice

⚠️
No AM/FM radio reception
⚠️
Remote keyless entry may not work or has reduced range

4. Step-by-Step Diagnosis

Inspect antenna wiring for chafing or pinching against metal surfaces

Check antenna and module connectors for corrosion or bent pins

Test antenna base for internal short using a multimeter

If wiring and antenna are good, suspect BCM or radio module failure

5. Frequently Asked Questions

Is it safe to drive?▼

Yes, the vehicle is safe to drive. The issue only affects radio and keyless entry functions.

How much does it cost to fix?▼

Repair costs typically range from $100 to $400, depending on whether it's a wiring repair, antenna replacement, or module replacement.

6. Related Codes

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