B1899

Q: Will B1899 clear itself?

B1899 may clear itself after a few drive cycles if the underlying issue was temporary (such as a loose gas cap or minor sensor glitch). However, if the underlying problem persists, the code will return. It's best to have the vehicle diagnosed even if the light goes off.

Low Severity (Level 1)

Microphone Input Signal Circuit Open

B1899 usually means microphone Input Signal Circuit Open.

Can you still drive with B1899?

✅Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.

Typical repair cost: $110 – $900

Severity Level 1 — Low

This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.

Common Symptoms

Phone/Bluetooth working intermittently, then stopping completely
Phone/Bluetooth not working — no response when activated
Infinite resistance in the phone/Bluetooth/telematics circuit — broken wire or disconnected connector
Fault may be intermittent — code may clear itself and reappear
Reduced vehicle functionality related to the phone/Bluetooth/telematics system

Possible Causes

Broken wire or connector pin in the phone/Bluetooth/telematics system harness — common at flex points like door jambs or where wiring moves
Disconnected or loose electrical connector — may have been bumped during other repairs
Failed telematics module — internal open circuit from age, heat cycling, or vibration
Corrosion completely severing a wire or connector terminal — green crust on copper wiring
Wiring harness damage from rodent chewing — look for nesting material near the engine or under dash

Common Fixes

Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($38-149 at shop, free at auto parts store for basic scan)
Visually inspect the phone/Bluetooth/telematics system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $104 diagnostic fee at shop)
Trace the phone/Bluetooth/telematics system wiring from connector to connector with a multimeter set to continuity/resistance mode — find and repair the break in the circuit ($106-320 labor for diagnosis and repair)
Check and reseat all connectors in the phone/Bluetooth/telematics system circuit — disconnect, inspect pins, clean with electrical contact cleaner, apply dielectric grease, and reconnect firmly ($10 DIY or $80 shop minimum)
If telematics module has failed internally (open circuit inside), replace it — don't try to repair sealed components ($100-800)

Estimated Repair Cost

$110 – $900(typical range; varies by vehicle make and model)

These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.

Frequently Asked Questions

What does B1899 mean?

B1899 stands for "Microphone Input Signal Circuit Open". B1899 usually means microphone Input Signal Circuit Open.

Can you drive with B1899?

Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.

How much does it cost to fix B1899?

Repair costs for B1899 typically range from $110 to $900, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($38-149 at shop, free at auto parts store for basic scan); Visually inspect the phone/Bluetooth/telematics system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $104 diagnostic fee at shop); Trace the phone/Bluetooth/telematics system wiring from connector to connector with a multimeter set to continuity/resistance mode — find and repair the break in the circuit ($106-320 labor for diagnosis and repair).

Will B1899 clear itself?

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Related OBD-II Codes

These codes are in the same range as B1899 and often share similar causes and fixes.

B0001— Driver Frontal Stage 1 Deployment Control B0002— Driver Frontal Stage 2 Deployment Control B0003— Driver Frontal Stage 3 Deployment Control B0004— Driver Knee Bolster Deployment Control B0005— Collapsible Steering Column Deployment Control

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