B1623
Moderate Severity (Level 3)Lamp Keypad Output Circuit Failure
B1623 usually means lamp Keypad Output Circuit Failure.
Can you still drive with B1623?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $100 – $800
Severity Level 3 — Moderate
This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.
Common Symptoms
- Check Engine Light illuminated
- Key/ignition not functioning as expected
- Engine cranks but won't start — immobilizer preventing start
- Diagnostic trouble code (DTC) stored in module memory
Possible Causes
- Failed immobilizer antenna — internal fault from age, heat cycling, and vibration
- Damaged wiring or corroded connector in the key/immobilizer system circuit
- Blown fuse for the key/immobilizer system circuit — check before replacing components
- Faulty control module driving the immobilizer antenna
- Loose or corroded ground point shared by the key/immobilizer system
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 ($18-107 at shop, free at auto parts store for basic scan)
- Visually inspect the key/immobilizer system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $126 diagnostic fee at shop)
- If the engine cranks but won't start, check the security/immobilizer light — if flashing, try a different key. Key programming may be needed ($149-359 at dealer or locksmith)
- Replace immobilizer antenna if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($100-800)
- Check and replace any blown fuses in the key/immobilizer system fuse circuit — if fuse blows again, there's still a short that needs to be found ($4-17 for fuses)
Estimated Repair Cost
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 B1623 mean?
B1623 stands for "Lamp Keypad Output Circuit Failure". B1623 usually means lamp Keypad Output Circuit Failure.
Can you drive with B1623?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B1623?
Repair costs for B1623 typically range from $100 to $800, 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 ($18-107 at shop, free at auto parts store for basic scan); Visually inspect the key/immobilizer system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $126 diagnostic fee at shop); If the engine cranks but won't start, check the security/immobilizer light — if flashing, try a different key. Key programming may be needed ($149-359 at dealer or locksmith).
Will B1623 clear itself?
Explore Repair Costs
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