B2115 — Rear Washer Input Short to Ground

Will B2115 clear itself?

Sometimes B2115 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.

What does OBD2 code B2115 mean?

B2115 — Rear Washer Input 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, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.

How do I diagnose B2115 myself?

Start with a scan: confirm B2115, 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 B2115?

BCM repair or replacement — $300–$900; Repair wiring or connectors — $80–$250; 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.

Is it safe to drive with B2115?

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.

The Rear Washer Input Short to Ground fault — B2115 — tells you the body control module has detected an unexpected electrical condition. Specifically, it found a circuit that should carry voltage is instead grounded somewhere it shouldn't be. This happens within the rear washer system's wiring or components, and the module logs the fault when sensor readings fall outside factory specifications.

Modern vehicles pack dozens of functions into the body electrical system: wipers, washers, locks, windows, and lighting all communicate through the Body Control Module (BCM). The BCM acts as a central hub, constantly watching voltage and resistance across these circuits. When B2115 appears, it means the rear washer input line has lost its proper voltage and is reading as a direct ground short. The module flags this across multiple drive cycles before confirming the fault, which is why you might see the warning light come and go before it stays on. Freeze frame data — a snapshot of RPM, engine load, coolant temperature, and speed captured at the moment of failure — helps pinpoint exactly what conditions triggered B2115.

The rear washer itself may fail intermittently or stop working entirely. Depending on your vehicle's setup, this might also affect related washer functions or trigger a dashboard warning light. One important point: B2115 does not impact engine performance, fuel economy, or emissions. The code lives entirely within the body electrical network.

Symptoms of B2115

The rear washer fails to activate or operates erratically. In some cases, related washer functions share circuits with the faulty line, so you might notice problems with the front washer or fluid pump as well. The check engine light typically does not illuminate for this fault — instead, expect a dedicated body system warning or just an inoperative washer. The vehicle drives normally otherwise, with no changes to throttle response, shifting, or braking behavior. Electrical accessories may flicker briefly when the short occurs, though this is less common.

Common Causes of B2115

The most frequent trigger is a blown fuse or failed relay in the washer circuit — this is also the cheapest to fix. A faulty rear washer switch or a failed washer motor/actuator can also produce this code by allowing current to bypass normal pathways. Corrosion or looseness at electrical connectors — especially those exposed to road salt, rain, or frequent washing — creates intermittent shorts that the BCM eventually flags as B2115. A failing Body Control Module itself can misinterpret valid signals or develop internal shorts, though this is less common than wiring issues. Finally, wiring damage in flex areas like the tailgate, liftgate, or rear hatch hinges causes wires to chafe and ground out. These high-motion zones see constant flexing and are prime locations for hidden damage.

How to Diagnose B2115

Start by connecting an OBD2 scanner and confirming B2115 is stored. Record the freeze frame data — it tells you engine speed, load, and temperature at the moment the module detected the fault. Next, check for related body codes. B2100 through B2105 often share common circuitry, and a pattern of codes can point toward a single root cause like a shared ground or power feed. Consult manufacturer TSBs for your specific make, model, and year — many body electrical faults have documented factory fixes or software updates that a scanner alone cannot apply. Then perform a visual inspection of all wiring and connectors tied to the rear washer circuit. Look for cracked insulation, green corrosion buildup, and connectors that are dark, melted, or loose. With the ignition on, activate the rear washer switch while monitoring voltage at the motor or pump connector. A reading near zero volts confirms the short; proper operation shows battery voltage during activation. Pay close attention to wiring near the rear hatch and tailgate hinges — these are the most vulnerable points on most vehicles. After clearing the code, complete a full drive cycle that recreates the freeze frame conditions and verify that B2115 does not return.

Repair Options and Costs

Repairing B2115 involves fixing the specific shorted component or wiring. BCM replacement or repair ranges from $300 to $900 depending on whether the module can be rebuilt or requires a new unit. Wiring harness repair or connector replacement typically costs $80 to $250 when the damage is accessible. If the rear washer switch or motor itself has failed, expect to pay $120 to $450 for the part plus labor.

Total Cost to Fix B2115

The actual repair cost hinges entirely on what caused the short. In most cases, you are looking at the lower end of the range — a corroded connector cleaned and repaired for $80 to $150, or a blown fuse replaced for under $20. BCM replacement at $900 represents the maximum scenario and is rarely the first thing to check. Always pursue a systematic diagnosis before purchasing expensive parts. Labor rates at independent shops typically run $75 to $120 per hour, and most body electrical repairs take one to two hours. Confirm the exact fault before committing to BCM replacement.

Can You Drive with B2115?

Yes — in most cases, B2115 poses no immediate threat to drivability. Body electrical faults rarely affect engine performance, transmission operation, or braking systems. You can continue driving while you schedule a repair. That said, do not ignore the code if your vehicle has integrated safety features into the affected circuit. A rear washer short that also involves rear wiper functionality creates a visibility hazard in rain or snow. Central locking faults flagged under related codes can leave a vehicle unsecured. Use your judgment and repair the fault promptly, especially before long trips or adverse weather.

Related OBD2 Codes

• B2100: Door Driver Key Cylinder Switch Failure
• B2101: Head Rest Switch Circuit Failure
• B2102: Antenna Circuit Short to Ground
• B2103: Antenna Not Connected
• B2104: Door Passenger Key Cylinder Switch Failure
• B2105: Throttle Position Input Out of Range Low