B1576 — Lamp Park Input Circuit Open

What does OBD2 code B1576 mean?

OBD2 code B1576 flags a problem with the body electrical system (lamp park input circuit open). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.

How much does it cost to fix B1576?

Repair wiring or connectors — $80–$250; BCM repair or replacement — $300–$900; Replace the switch or actuator — $120–$450. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What is the most common cause of B1576?

The most common causes are: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.

How do I diagnose B1576 myself?

Start with a scan: confirm B1576, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the lamp park input, and verify the suspect component against live data before buying parts.

Is it safe to drive with B1576?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

When your scan tool pulls code B1576, the vehicle's control module is telling you it cannot detect a signal on the lamp park input circuit — the electrical path is broken somewhere between the switch or sensor and the module that expects to see it. This falls under the body electrical category in the OBD2 standard, which covers comfort and convenience features rather than engine management. The module monitors this circuit continuously; when the voltage or resistance reading falls outside the expected range for a set number of drive cycles, B1576 gets stored and the check engine or warning light may illuminate.

"Circuit open" simply means the electrical loop is incomplete — current cannot flow through that specific pathway. The problem could be a severed wire, a connector that has come loose or corroded, a fuse that has blown, or a component internally open. The module itself is doing exactly what it is programmed to do: flagging an abnormal condition so the driver or technician knows something in the body system needs attention.

One of the first things to understand about B1576 is that the fault often has a specific trigger. When the code sets, the module saves a freeze frame — a snapshot of engine RPM, load, coolant temperature, and vehicle speed at the exact moment the failure occurred. That data is gold when you are chasing an intermittent problem, because it tells you what conditions were present when the circuit misbehaved.

Common symptoms of B1576

The lamp park input circuit feeds a range of body functions depending on your vehicle. Symptoms you may notice include:

• The related feature — whether it is lighting, wipers, power locks, or windows — stops working or operates inconsistently
• A dashboard warning light illuminates, though the check engine light may or may not be present
• Intermittent operation that comes and goes, especially in wet or cold conditions
• The affected component works fine one moment and fails the next, which suggests a loose connection or broken wire that moves when the vehicle vibrates
• In most cases, engine performance and drivability are not affected — the problem is isolated to body electrical

What causes B1576?

Start with the most common culprits. In most repair experience with B1576, the root cause is one of the following:

• A blown fuse that supplies power to the lamp park input circuit
• A broken or severed wire somewhere in the harness, often where it flexes repeatedly
• A connector that has become unplugged, has a pin backed out, or shows signs of corrosion
• Wires damaged by moisture, road salt, or chafing — especially in door jambs and near hinges
• An internally open switch, motor, or actuator in the affected system
• A faulty body control module (BCM) that cannot process the input signal correctly
• A failed relay feeding the circuit

How to diagnose B1576

Working through B1576 methodically prevents unnecessary part replacement. Follow these steps:

1. Connect your OBD2 scanner and confirm B1576 is stored. Record the freeze frame data before clearing anything — it tells you engine load, RPM, coolant temperature, and speed when the fault occurred.
2. Pull all stored codes. Related codes in the B0xxx or U-code ranges often point to the real culprit, such as a short or loss of ground.
3. Check manufacturer TSBs for your make, model, and year. Some body electrical faults have documented software updates or known fixes — search by VIN on the manufacturer site or nhtsa.gov.
4. Visually inspect the harness and connectors tied to the body electrical system. Look for broken insulation, green corrosion, or pins that are pushed back in their housings.
5. Perform a continuity test on the lamp park input circuit from end to end. Wiggle the wiring while monitoring the meter — a fluctuating reading indicates an intermittent open.
6. Operate the affected component while watching live data on your scanner. This confirms whether the module is receiving the expected input signal.
7. Clear the code, complete a full drive cycle that recreates the freeze frame conditions, and verify B1576 does not return.

Repair options and costs

Address the inexpensive possibilities before replacing expensive components. Typical repair scenarios for B1576 (parts and labor, USD, independent shop rates):

• Wiring repair or connector replacement: $80–$250
• Body control module repair or replacement: $300–$900
• Switch or actuator replacement: $120–$450

The total bill depends entirely on what part failed. Always confirm the root cause with testing before buying a BCM — it is the most expensive fix and rarely the first thing to go.

Can you drive with B1576?

In most vehicles, B1576 is a low-severity code. Body electrical faults typically do not affect engine operation, braking, or steering. You can usually continue driving.

That said, consider what system the lamp park input controls on your vehicle. If it is exterior lighting, you lose visibility or turn signal function. If it is wipers and the weather is bad, that is a safety concern. Central locking failures can leave the car unsecured. Use common sense — get it diagnosed and repaired promptly, but you do not need to call a tow truck the moment the light comes on.

Related OBD2 codes

• B1500: Lamp Turn Signal Left Circuit Open
• B1501: Lamp Turn Signal Left Circuit Short To Battery
• B1502: Lamp Turn Signal Left Circuit Short To Ground
• B1503: Lamp Turn Signal Right Circuit Failure
• B1504: Lamp Turn Signal Right Circuit Open
• B1505: Lamp Turn Signal Right Circuit Short To Battery