B1626 — Lamp Keypad Output Short Circuit To Ground

B1626 — Lamp Keypad Output Short Circuit To Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: faulty switch, motor or actuator of the affected system, corroded or loose connectors, body control module (BCM) fault.

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 B1626 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 B1626 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1626 (parts and labor, USD, independent shop rates): Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250; BCM repair or replacement: $300–$900. Overall, fixing B1626 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

Is it safe to drive with B1626?

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.

What are the symptoms of B1626?

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.

Will B1626 clear itself?

Sometimes B1626 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 B1626 myself?

Start with a scan: confirm B1626, 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.

How much does it cost to fix B1626?

Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250; 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.

When your vehicle's computer detects a problem with the lamp keypad circuit, it logs trouble code B1626. This specific code identifies a short circuit condition where the keypad output signal is being pulled to ground when it shouldn't be. The body control module, responsible for managing various interior and exterior lighting functions, expects to see a specific voltage range at this circuit. When that signal drops to ground potential instead, the module recognizes the fault and illuminates the check engine light while storing the code for later diagnosis.

Code B1626 falls within the body electronics category of OBD2 trouble codes, which means it has nothing to do with engine performance, fuel delivery, or emissions control systems. The affected circuit controls functions you interact with daily through the instrument panel keypad or headlight switch. To help technicians pinpoint when and how the failure occurred, the control module also saves a freeze frame snapshot capturing engine speed, load percentage, coolant temperature, and vehicle speed at the exact moment the fault was detected. This data proves invaluable during troubleshooting because it lets you reproduce the specific conditions that triggered B1626 in the first place.

The diagnostic process begins with understanding that B1626 represents an electrical short to ground in the lamp keypad output circuit. This isn't a mechanical failure—it's an electrical fault where a wire's insulation has failed, a connector has become compromised by moisture, or a component has developed an internal short. Identifying which of these scenarios applies requires systematic testing, and the freeze frame data gives you the starting point.

Common Symptoms of B1626

The specific lighting function controlled by the affected keypad button operates intermittently or stops working entirely
An illuminated warning indicator appears on the instrument cluster, often displaying a generic "check accessories" message
Multiple functions controlled by the same circuit may fail simultaneously
The malfunction typically occurs regardless of engine operating conditions
In most vehicles, engine performance, fuel economy, and drivability remain unaffected
The fault may come and go, especially if vibration or moisture exposure triggers it temporarily

What Causes B1626?

Chafed or broken wiring insulation in door jambs and areas exposed to moisture and flexing
Water intrusion at electrical connectors, particularly in vehicles frequently exposed to rain or car washes
Failed switch or actuator component with internal short circuit
Corroded electrical terminals within the affected connector assembly
Loose or partially unplugged harness connections at the body control module
Body control module internal circuitry failure, though this ranks among the less frequent causes

How to Diagnose B1626

Before beginning any disassembly, connect a quality OBD2 scanner and retrieve all stored codes, not just B1626. Related trouble codes often point toward the underlying cause—for example, multiple ground-related codes might indicate a shared ground connection has failed. After recording B1626 and its freeze frame data, check manufacturer technical service bulletins specific to your make, model, and year using your vehicle identification number. Many body electrical faults have documented factory remedies or require software calibration updates rather than physical repairs.

Perform a thorough visual inspection of the wiring harness in question, paying special attention to locations where wires bend around hinges, grommets, and trim panels. Door jamb areas are particularly vulnerable because the wiring must flex every time a door opens and closes. Look for cracked insulation, exposed copper, green or white corrosion deposits, and any signs of heat damage or melting. Operate the affected function while monitoring relevant parameter IDs in the scanner's live data stream, watching for voltage readings that don't match expected values.

Check all related connectors for solid engagement and clean terminals. Use dielectric grease or proper electrical contact cleaner as needed. If the fault persists through visual inspection, perform circuit resistance and ground checks according to your vehicle's wiring diagram. After clearing the code, complete a drive cycle that replicates the freeze frame conditions—same speeds, same temperatures, same accessory loads—and verify that B1626 does not return.

Repair Options and Costs

Address the least expensive and most probable causes before considering component replacement. Wiring harness repair at damage points costs between $80 and $250 depending on accessibility and whether professional soldering or connector replacement is required. Switch or actuator replacement for the affected function typically runs $120 to $450 in parts and labor at an independent shop. If inspection confirms the body control module itself has failed, BCM repair or replacement generally costs $300 to $900, though this represents the least likely scenario.

Most independent shops charge $75 to $150 per hour for diagnostic labor, so a complete diagnosis plus repair typically falls within the lower end of these ranges. Dealership service centers charge more but have access to the latest technical information and factory training.

Total Repair Cost Summary

For most vehicles experiencing B1626, expect to pay between $80 and $900 total, with the majority of cases resolving in the $150 to $300 range. Spending time on careful diagnosis before purchasing parts prevents the common mistake of replacing expensive components when the actual problem is damaged wiring or a simple connector issue.

Can You Drive with B1626?

B1626 presents minimal risk to vehicle operation in most circumstances since it involves comfort and convenience features rather than safety-critical systems. However, if the fault affects exterior lighting circuits, you may lose turn signals, brake lights, or headlights—situations that create genuine safety hazards, especially during nighttime driving or inclement weather. Central locking malfunctions associated with this code can leave your vehicle unsecured or unable to lock properly. Given these considerations, the severity level for B1626 remains short: address the fault within a reasonable timeframe, but an immediate roadside stop is unnecessary unless exterior lights are involved.