B1522 — Hood Switch Circuit Short To Ground

How much does it cost to fix B1522?

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

Will B1522 clear itself?

Sometimes B1522 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How do I diagnose B1522 myself?

Start with a scan: confirm B1522, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the body electrical system, and verify the suspect component against live data before buying parts.

What are the symptoms of B1522?

Drivers most often notice: warning light on the dashboard, the affected function (locks, windows, lighting, wipers) works intermittently or not at all, no impact on engine operation in most cases.

What does OBD2 code B1522 mean?

B1522 — Hood Switch Circuit Short To Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, blown fuse or failed relay, damaged wiring in door jambs or wet areas.

The engine control module logs code B1522 when it detects an unwanted voltage path to ground in the hood switch circuit. This is fundamentally a body electrical problem, not an engine management issue. The hood switch tells your vehicle's body control module whether the hood is open or closed—a piece of information used for interior lighting, the security system, and sometimes the remote start function. When that circuit develops a short to ground, the BCM receives a signal that makes no sense, and it stores B1522 to flag the fault.

The module does not set this code lightly. Most manufacturers require the short-to-ground condition to appear consistently across multiple ignition cycles before illuminating the check engine light. This two-step confirmation prevents false triggers from temporary voltage glitches. When B1522 is stored, the freeze frame data shows exactly what was happening when the fault was detected—engine load, RPM, coolant temperature, and vehicle speed. That snapshot tells you whether the problem occurs during cold starts, at highway speeds, or only when the engine is hot.

Common symptoms of B1522

• Check engine or body system warning light illuminates
• Interior dome light fails to turn off, or stays off when it should activate
• Security system may not arm or disarm correctly
• Hood ajar warning indicator behaves incorrectly or stays on continuously
• Affected electrical functions operate intermittently or stop working entirely
• In some cases, slow battery drain due to constant circuit draw
• Engine performance and drivability typically unaffected

What causes B1522?

• Damaged wiring insulation in the hood switch circuit, often from heat exposure or chafing
• Corrosion buildup on the hood switch connector terminals from moisture intrusion
• Faulty hood switch itself, mechanically or electrically failed
• Body control module internal failure affecting the hood circuit input
• Blown fuse or failed relay in the body electrical circuit
• Poor ground connection at the switch mounting point
• Wiring harness damage at flex points like door jambs or hinges

How to diagnose B1522

1. Connect an OBD2 scanner and verify that B1522 is stored in the BCM—not just the powertrain control module. Save the freeze frame data for reference.
2. Check for any related body system codes. Frequently, B1522 appears alongside other body electrical faults that point directly to the root cause.
3. Consult manufacturer technical service bulletins for your specific make, model, and model year. Many body code issues have documented fixes or software updates.
4. Perform a visual inspection of the hood switch and its wiring harness. Look for cracked insulation, green corrosion on terminals, and any signs of water entry or heat damage.
5. Test the hood switch with a multimeter for proper resistance values, and verify the circuit behavior at the BCM connector using wiring diagrams specific to your vehicle.
6. Clear the code, operate the vehicle through a complete drive cycle including the conditions captured in the freeze frame data, and confirm B1522 does not return.

How to fix B1522

Address the cheapest probable causes before committing to expensive component replacement.

• Repair damaged wiring or corroded connectors — $80–$250
• Replace the hood switch or affected actuator — $120–$450
• BCM repair or replacement — $300–$900

How much does it cost to fix B1522?

Final cost depends entirely on which component is responsible for the short. At independent repair shops in the United States, typical B1522-related repairs break down as follows: wiring harness repair or connector replacement runs $80 to $250 including parts and labor. If the hood switch itself is faulty, expect to pay $120 to $450 depending on the part cost and labor time for your vehicle. A failed body control module is the most expensive scenario, with repair or replacement ranging from $300 to $900. Most B1522 faults are resolved for under $450, but an accurate diagnosis before purchasing parts is always the smarter approach.

Can you drive with B1522?

Generally safe to operate—the body electrical system does not typically affect engine operation or transmission function. However, consider the practical risks: a malfunctioning hood switch may leave your interior dome light on, draining the battery over time. If your security system is affected, the vehicle may not lock or unlock properly. Address B1522 before any extended trip or if you notice electrical inconsistencies.