B1446 — Wiper Park Sense Circuit Failure

B1446 — Wiper Park Sense Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, damaged wiring in door jambs or wet areas, blown fuse or failed relay.

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 B1446 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 B1446 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1446 (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 B1446 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 B1446?

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 much does it cost to fix B1446?

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.

How do I diagnose B1446 myself?

Start with a scan: confirm B1446, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the wiper park sense circuit, and verify the suspect component against live data before buying parts.

What does OBD2 code B1446 mean?

What is the most common cause of B1446?

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

When your vehicle's computer logs code B1446, it means the body control system has detected a problem with the wiper park position sensor circuit. The wiper park sense is a small but important component—it tells the car where the wipers are positioned so they stop in the correct location at the bottom of the windshield when you turn them off. If the module cannot read a valid signal from this sensor circuit, it flags B1446 and illuminates the malfunction indicator light. This falls under the body electrical category, meaning the engine itself usually runs fine, but one of your convenience features is not operating as designed.

Modern vehicles rely on a network of sensors and switches feeding information to the body control module, which acts as the brain for non-powertrain electrical functions. The BCM constantly monitors inputs from door locks, windows, lighting, and wiper systems while you drive. When the wiper park sense circuit delivers readings outside the expected range for more than the programmed number of drive cycles, the module interprets this as a genuine fault rather than a momentary glitch. Storing B1446 and turning on the warning light is how the system tells you something needs attention. The freeze frame data captured alongside the code is particularly useful—it records engine speed, load, temperature, and vehicle speed at the exact moment the fault occurred, giving you a reliable starting point for troubleshooting.

Symptoms

No noticeable effect on engine performance or drivability in most applications
Wipers fail to park correctly, stop mid-windshield, or do not operate at all
Intermittent operation where wipers work sometimes and fail other times
Dashboard warning light stays illuminated after the fault is detected
Other body electrical functions may behave erratically if a shared connector or ground is involved
In rare cases, associated circuits such as the washer pump may also be affected

Causes

Broken or frayed wiring in high-movement areas, particularly door jambs and trunk lids where flexing damages conductors over time
Corrosion, moisture intrusion, or loose electrical connectors at the wiper motor or park sensor assembly
Faulty wiper park position switch or worn contacts inside the wiper motor assembly
Body control module itself failing or losing proper software calibration
Short or open circuit in the park sense wiring caused by age, water exposure, or physical damage
Poor ground connection at the wiper motor or BCM affecting signal integrity

How to Diagnose

Retrieve the code and freeze frame using a compatible OBD2 scanner. Record the pending and stored B1446 entries along with all available freeze frame parameters—these conditions must be replicated during the confirmation drive cycle.
Search for applicable technical service bulletins for your specific make and model year. Many body electrical faults including B1446 have documented factory remedies, software updates, or known failure patterns that can save significant diagnostic time.
Perform a thorough visual inspection of the wiper motor harness and connectors. Look for cracked insulation, broken strands inside the wire, green corrosion on terminals, and any signs of water entry or prior repair work that may have been done incorrectly.
Check live data while operating the wiper system. Monitor the park position sensor PID on compatible scanners—if the reading stays stuck at one value or jumps erratically while you move the wipers through their travel, you have isolated the circuit at fault.
Examine connectors at flex points where wires pass through door frames or hinges. These areas endure repeated bending and are the most common locations for broken conductors that cause intermittent open circuits.
Clear B1446 and complete a drive cycle that reproduces the conditions captured in the freeze frame. If the code returns, you have confirmed an active fault and can proceed to repair with confidence.

Repair Options with Costs

Wiper park switch or motor replacement: $120–$450
Wiring repair or connector replacement: $80–$250
BCM repair or full module replacement: $300–$900

How Much Does It Cost to Fix B1446?

The total repair cost for B1446 depends entirely on which component is actually at fault. Replacing a faulty wiper park switch or motor is the most common and least expensive scenario, typically running $120–$450 depending on your vehicle and labor rates. Wiring repairs or connector replacement generally fall between $80 and $250 when the issue is localized to a damaged harness section. The body control module itself is the most expensive component to address, with repair or replacement ranging from $300 to $900. Most shops charge $80–$150 per hour for diagnostic work on top of parts costs. Plan on a total bill between $80 and $900 for a complete resolution of B1446, with the lower end representing the majority of actual repair situations.

Driving-Safety Verdict

B1446 is classified as a short-severity fault—your vehicle remains generally safe to operate. Body electrical codes of this type rarely compromise engine operation, transmission function, or braking systems. However, functional wiper blades and properly parked wipers are essential for clear visibility in rain or snow, and a central locking fault could potentially leave your vehicle unsecured. Address B1446 before extended wet-weather driving or long trips to restore full visibility and electrical redundancy.