B1570 — Lamp Headlamp High-Beam Circuit Short To Ground

B1570 — Lamp Headlamp High-Beam Circuit Short To Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, corroded or loose connectors, damaged wiring in door jambs or wet areas.

body electrical

Is it safe to drive?

Short-term driving is OK 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.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1570 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1570 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1570 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; Replace the switch or actuator: $120–$450; BCM repair or replacement: $300–$900. Overall, fixing B1570 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of B1570?

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 is the most common cause of B1570?

The most common causes are: blown fuse or failed relay, corroded or loose connectors, damaged wiring in door jambs or wet areas.

How much does it cost to fix B1570?

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

What does OBD2 code B1570 mean?

Is it safe to drive with B1570?

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 OBD2 scanner pulls code B1570, it's reporting a specific electrical problem in your vehicle's lighting system. B1570 stands for "Lamp Headlamp High-Beam Circuit Short To Ground," which means the body control module has detected an abnormal condition in the high-beam headlamp circuit. This is a body electrical fault, not an engine or drivetrain issue, so you won't feel it in how the car drives—but you'll definitely notice when your high beams refuse to work properly.

The affected system monitors your headlamp high-beam circuit continuously while the vehicle is running. The control module expects to see specific voltage patterns through the circuit. When a short to ground occurs—meaning current is bleeding to the vehicle's chassis instead of following its intended path—the module registers this as an out-of-range condition. The system typically allows for minor fluctuations, but if the fault persists across a defined number of drive cycles, B1570 gets stored and the check engine or body system warning light illuminates on your dashboard. The freeze frame data captured alongside B1570 is valuable diagnostic information—it records the exact engine speed, load, temperature, and vehicle speed at the moment the fault was first detected.

What triggers code B1570

The root causes of B1570 typically trace back to issues in the high-beam electrical circuit. The most frequent culprits involve damaged wiring, particularly in areas exposed to moisture or repeated flexing. Door jambs and engine bay connections are especially vulnerable spots where wires can chafe, crack, or corrode over time. Faulty switches or actuators in the headlamp circuit commonly set this code as well. Poor electrical connections at plugs and connectors lead to resistance and shorts, while a blown fuse or failed relay in the high-beam circuit can also trigger B1570. In some cases, the body control module itself develops an internal fault and incorrectly reports the short even when wiring appears sound.

Symptoms of B1570

High-beam headlamps fail to activate or work only intermittently
High-beam indicator light on the dashboard stays dark when activated
Low-beam function operates normally while high beams are inoperative
May accompany other body electrical codes in the same circuit
Vehicle's lighting system enters a protective limp mode
No effect on engine performance, transmission operation, or fuel economy

Diagnosing B1570 step by step

Pinpointing the exact cause of B1570 requires methodical troubleshooting rather than guessing. First, connect an OBD2 scanner and confirm that B1570 is the stored fault code. Record the freeze frame data—this shows you precisely what conditions existed when the module detected the problem, which guides your inspection strategy. Next, check for any related trouble codes in the body control system; secondary codes often point to the underlying cause. Consulting manufacturer technical service bulletins for your specific make and model can reveal known issues or factory-recommended repair procedures for this code family.

Visually examine all wiring and connectors associated with the headlamp circuit. Focus on areas where wires bend repeatedly, such as door hinges and hood-to-firewall passages. Look for broken insulation, corroded pins, moisture intrusion, or loose-fitting connectors. Use multimeter testing at key test points to verify circuit continuity and check for unwanted ground paths. Finally, clear the code and complete a drive cycle that recreates the conditions captured in the freeze frame data. If B1570 does not return, the issue was likely temporary; if it reappears, you have confirmed an active fault requiring repair.

Repair options and costs for B1570

Depending on what inspection reveals, several repair paths address B1570:

Wiring repair or connector replacement: $80–$250
High-beam switch or actuator replacement: $120–$450
Body control module diagnosis, repair, or replacement: $300–$900

Always start with the least expensive possible causes—damaged wiring and loose connectors—before replacing costly components like the BCM. An accurate diagnosis prevents spending $900 on a new module when the real problem was a corroded connector worth $50.

Can you drive with B1570?

B1570 carries a short severity rating because it does not affect engine operation or vehicle drivability. Your car will start, accelerate, and stop normally. However, the lack of functional high beams reduces nighttime visibility and eliminates the ability to signal other drivers—a safety consideration on unlit roads or in poor weather. If your vehicle has central locking issues alongside this code, the unsecured door situation becomes more concerning. For most drivers, short trips to the repair shop are acceptable, but prolonged driving without functioning high beams is not recommended, especially in low-light conditions.