B1562 — Door Lock Cylinder Circuit Short To Ground

What is the most common cause of B1562?

The most common causes are: corroded or loose connectors, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.

What are the symptoms of B1562?

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

How much does it cost to fix B1562?

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.

How do I diagnose B1562 myself?

Start with a scan: confirm B1562, 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.

Will B1562 clear itself?

Sometimes B1562 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.

When your vehicle's body control module detects an unexpected electrical path in the door lock circuit, it logs trouble code B1562. The full definition reads "Door Lock Cylinder Circuit Short To Ground," which tells you that somewhere between the switch and the actuator, voltage is leaking to the vehicle's metal frame instead of completing its intended loop. This is a body system code, meaning it lives in the module responsible for doors, lighting, wipers, and other comfort features—not the engine computer.

The control module constantly monitors voltage levels at key points throughout the body electrical network. When you press the lock or unlock button, it expects to see a specific voltage pattern travel through the circuit. If that pattern shows a direct connection to ground where it shouldn't exist, the module logs B1562. To distinguish a real problem from temporary electrical noise, the code typically requires the same fault condition across multiple drive cycles before it actually sets and illuminates the dashboard warning light. Once triggered, the module saves a freeze frame snapshot capturing engine speed, load, coolant temperature, and vehicle speed at the exact moment the failure occurred. That snapshot is invaluable when you start diagnosing—recreating those conditions makes the fault far easier to reproduce and verify.

Symptoms of B1562

• Door locks respond sluggishly, work only intermittently, or stop functioning entirely
• Dashboard warning indicator remains illuminated after starting the vehicle
• No effect on engine performance, fuel delivery, or transmission operation in most cases
• Central locking may fail on one or multiple doors simultaneously
• In rare configurations, related body functions (interior lighting, mirror adjustment) may behave erratically
• The malfunction indicator lamp may turn off after a battery disconnect but returns once the module re-evaluates the circuit

Common causes of B1562

• Failed door lock switch or worn contacts inside the cylinder mechanism
• Door lock actuator motor burnout or mechanical binding
• Corrosion buildup on electrical connectors, particularly in areas exposed to moisture
• Wiring insulation deterioration in door jambs where flexing occurs repeatedly
• Blown fuse protecting the door lock circuit or failed relay contacts
• Body control module internal failure or software calibration error
• Loose connector housings allowing intermittent ground paths

How to diagnose B1562

1. Connect an OBD2 scan tool and confirm B1562 is stored in the body module. Record the pending versus permanent status and save all freeze frame data—this tells you whether the fault is active right now or was recorded during a past drive.
2. Check for any accompanying diagnostic codes. Body system faults often cascade, so a failing actuator might also trigger related door or lighting codes. Cross-reference those to narrow your focus.
3. Perform a thorough visual inspection of the door lock circuit wiring. Focus on the boot where wiring passes through the door hinge pillar—this area endures constant flexing and is the most likely location for broken or chafed insulation.
4. Test the door lock switch and actuator motor directly using a multimeter. Measure resistance at the actuator terminals and compare against manufacturer specifications. An actuator drawing excessive current or showing open circuits confirms failure.
5. Wiggle-test the connectors while monitoring live data on your scan tool. If the door lock status PID flickers while you manipulate the harness, you've found an intermittent connection.
6. Clear the code and road test the vehicle under conditions matching your freeze frame data. If B1562 returns after completing a full drive cycle, the fault is confirmed and component-level repair is next.

Repair options with costs

• BCM repair or replacement: $300–$900 (module programming may be required on newer vehicles)
• Door lock switch or actuator replacement: $120–$450 (individual door actuators vary in price)
• Wiring harness repair or connector replacement: $80–$250 (soldering, terminal replacement, or harness renewal)

How much does fixing B1562 cost?

The total repair bill hinges entirely on which component caused the short-to-ground condition. Parts and labor at independent shop rates typically break down as follows: wiring and connector repairs run $80–$250 and resolve the majority of cases; switch or actuator replacement costs $120–$450 depending on your vehicle's make and model; BCM diagnosis and replacement ranges from $300–$900 when the module itself is confirmed faulty. Most owners spend between $80 and $300 fixing B1562 because the wiring issues and switch failures outnumber expensive module replacements. Always confirm the exact failure point before purchasing a new body control module—software reflash procedures sometimes clear module-related B1562 faults at no parts cost.

Can you drive with B1562?

Short answer: yes, usually. B1562 does not affect engine operation, transmission function, or critical safety systems like brakes and steering. Most drivers continue normal operation with this code stored. However, consider the specific failure mode. If your door locks no longer respond, your vehicle sits unsecured—particularly concerning in high-theft areas or overnight parking. Additionally, if the short-to-ground condition exists in a shared circuit, related systems may also fail unpredictably. Address this code within a reasonable timeframe even though immediate roadside breakdown is unlikely.

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