B1484 — Brake Pedal Input Open Circuit

B1484 — Brake Pedal Input Open Circuit. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: damaged tone (reluctor) ring on the hub, failed wheel speed sensor, faulty ABS module or pump motor.

body electrical

Is it safe to drive?

Drive with caution The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1484 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 ABS / stability control for damage, corrosion, chafing or poor contact.
Subsystem check Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Subsystem check Inspect the sensor and tone ring for metal debris and damage near the hub.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1484 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1484 (parts and labor, USD, independent shop rates): ABS module repair or replacement: $400–$1,200; Repair sensor wiring: $80–$250; Replace a wheel speed sensor: $120–$350. Overall, fixing B1484 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose B1484 myself?

Start with a scan: confirm B1484, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ABS / stability control, and verify the suspect component against live data before buying parts.

Is it safe to drive with B1484?

The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How much does it cost to fix B1484?

ABS module repair or replacement — $400–$1,200; Repair sensor wiring — $80–$250; Replace a wheel speed sensor — $120–$350. 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 B1484 mean?

Will B1484 clear itself?

Sometimes B1484 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.

B1484 OBD2 Trouble Code: Brake Pedal Input Open Circuit

When your scan tool displays B1484, the vehicle's control module has detected an open circuit condition in the brake pedal input circuit. This fault lives within the anti-lock braking and electronic stability control system, which falls under the body electrical category of the OBD2 standard. The brake pedal position sensor sends a voltage signal to the ABS module, telling it when and how hard you're pressing the brake. When that signal path is interrupted — whether through a broken wire, corroded connector, or failed component — the module registers the open circuit and sets B1484.

The module doesn't log this code after a single glitch. It watches for the fault to occur repeatedly under specific conditions before activating the warning light on your dash. When B1484 is stored, the accompanying freeze frame data captures engine load, RPM, coolant temperature, and vehicle speed at the moment of failure. That snapshot is valuable — it helps you recreate the exact circumstances during testing, so pay attention to those values before clearing anything.

Common Symptoms of B1484

The dashboard shows a stability control disabled message or an ABS/ESC warning light
Braking behavior feels different; you may notice the brake pedal pulsation changes compared to normal
The speedometer behaves erratically or cruise control refuses to engage
During hard braking, the ABS system fails to activate — you feel standard brake operation only
In some cases, multiple related codes appear alongside B1484, pointing toward the actual root cause

What Causes B1484?

Damaged sensor wiring or corroded connector — most common cause; wiring chafes against suspension components over time
Failed wheel speed sensor — the sensor itself can short or open internally
Blown fuse or low voltage supply — the ABS module needs consistent power to read brake pedal input correctly
Faulty ABS module or pump motor — the control unit itself can fail, though this is less common
Damaged tone (reluctor) ring — metal debris or physical damage on the ring at the hub creates erratic signals

How to Diagnose B1484

Connect an OBD2 scanner and confirm B1484 is stored in the ABS module. Save the freeze frame data immediately — it documents the exact engine and driving conditions when the fault occurred.
Pull all related trouble codes from every module. Codes in the P0300–P0399 or C0035–C0078 range often reveal the true source of the problem. Check manufacturer TSBs for your specific make and model using the VIN search on the manufacturer or NHTSA website — many B0xxx codes have documented factory fixes or software updates.
Perform a thorough visual inspection of the wiring harness and connectors feeding the ABS/stability control system. Look for damaged insulation, broken wires, corrosion buildup, or loose pins that would cause an open circuit.
Monitor all four wheel speed sensor PIDs on the scanner while driving slowly in a safe area. A faulty sensor will either drop out completely or display implausible speed readings compared to the others.
Inspect each wheel speed sensor and its tone ring for metal debris, cracking, or physical damage near the hub assembly.
Clear B1484 and complete a full drive cycle that reproduces the freeze frame conditions. If the code returns, the problem is confirmed and persistent.

Repair Options for B1484

The repair approach depends entirely on which component failed. Always start with the least expensive possibilities before committing to major part replacement:

Repair sensor wiring — $80–$250
Replace a wheel speed sensor — $120–$350
ABS module repair or replacement — $400–$1,200

Prices reflect typical parts and labor at independent shops in USD. Remanufactured modules may cost less than brand-new units, and some specialty repair shops can rebuild the module instead of replacing it entirely.

How Much Does Fixing B1484 Cost?

Expect to spend between $80 and $1,200 depending on which part is actually at fault. Wiring repairs sit at the low end, while full ABS module replacement represents the most expensive scenario. Get an accurate diagnosis before purchasing components — the priciest fix is rarely the first place to look, and guessing wrong means wasted money on parts that don't solve the problem.

Can You Drive with B1484?

The base hydraulic braking system typically remains functional, so careful driving is possible in the short term. However, ABS and electronic stability control are disabled, which means stopping distances increase significantly on wet, icy, or loose surfaces. The severity rating for this code is caution — drive conservatively to the repair shop and avoid aggressive maneuvers. Prompt attention is strongly recommended.