12475489 | Genuine GM® ABS Pressure Modulator Valve Assembly

**Description**: An ABS Pressure Modulator Valve **12475489**(PMV) - sometimes called an ABS hydraulic control unit or ABS modulator - is a key component of a vehicle’s Anti-lock Braking System (ABS).  The ABS Pressure Modulator Valve controls the brake fluid pressure sent to each wheel during braking. Its main job is to prevent the wheels from locking up under hard braking, allowing the driver to maintain steering control and stability. **Part Number:** 12475489 **Condition**: Remanufactured **Manufacture/Brand**: GM **Bill of Materials: 12475489** **Part Number****Type****12475489**Pressure Modulator Valve**12389541**ABS Control Unit**12548265**Valve Metering **Fits 12475489** For Year Make ModelEngineImportant vehicle option details1999-2000 Cadillac Escalade8 Cyl 5.7L1 TON CREW CAB, 1/2 TON, 3/4 TON, 4 DOOR 1/2 TON, CLASSIC 4 DOOR 1/2 TON, CREW CAB 1 TON, EXTENDED CAB 1 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 3/4 TON, K2500 CREW CAB, K3500 CAB CHASSIS 135.5, K3500 CAB CHASSIS 159.9, REGULAR CAB 1 TON, REGULAR CAB 3/4 TON, YUKON/DENALI/ESCALADE1995-1999 Chevrolet C15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L DieselC1500 EXTENDED CAB LONG BOX, C1500 EXTENDED CAB STANDARD BOX, C1500 REGULAR CAB LONG BOX, C1500 REGULAR CAB STANDARD BOX1995-2000 Chevrolet C25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LC2500 CREW CAB, C2500 EXTENDED CAB LONG BOX, C2500 EXTENDED CAB STANDARD BOX, C2500 REGULAR CAB1995-2002 Chevrolet C35008 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LC3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CAB CHASSIS 183.5, C3500 CREW CAB LONG WHEELBASE, C3500 CREW CAB SHORT WHEELBASE, C3500 EXTENDED CAB, C3500 REGULAR CAB1996-2002 Chevrolet Express6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L, 8 Cyl 8.1L1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS1995-1999 Chevrolet K15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L DieselK1500 EXTENDED CAB LONG BOX, K1500 EXTENDED CAB STANDARD BOX, K1500 REGULAR CAB LONG BOX, K1500 REGULAR CAB STANDARD BOX1995-2000 Chevrolet K25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LK2500 CREW CAB, K2500 EXTENDED CAB LONG BOX, K2500 EXTENDED CAB STANDARD BOX, K2500 REGULAR CAB1995-2000 Chevrolet K35008 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LK3500 CAB CHASSIS 135.5, K3500 CAB CHASSIS 159.9, K3500 CREW CAB LONG WHEELBASE, K3500 CREW CAB SHORT WHEELBASE, K3500 EXTENDED CAB, K3500 REGULAR CAB1997-1999 Chevrolet P306 Cyl 4.3L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LCHASSIS 1 TON MOTOR HOME HEAVY DUTY, CHASSIS DELIVERY, CHASSIS MOTOR HOME1995-1999 Chevrolet Suburban8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L1/2 TON, 3/4 TON1995-2000 Chevrolet Tahoe8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.7L, 8 Cyl 6.5L DieselCLASSIC 2 DOOR 1/2 TON, CLASSIC 4 DOOR 1/2 TON1995-1999 GMC C15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L DieselC1500 EXTENDED CAB LONG BOX, C1500 EXTENDED CAB STANDARD BOX, C1500 REGULAR CAB LONG BOX, C1500 REGULAR CAB STANDARD BOX1995-2000 GMC C25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LC2500 CREW CAB, C2500 EXTENDED CAB LONG BOX, C2500 EXTENDED CAB STANDARD BOX, C2500 REGULAR CAB1995-2000 GMC C35008 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LC3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CAB CHASSIS 183.5, C3500 CREW CAB LONG WHEELBASE, C3500 CREW CAB SHORT WHEELBASE, C3500 EXTENDED CAB, C3500 REGULAR CAB, K2500 EXTENDED CAB STANDARD BOX1995-1999 GMC K15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L DieselK1500 EXTENDED CAB LONG BOX, K1500 EXTENDED CAB STANDARD BOX, K1500 REGULAR CAB LONG BOX, K1500 REGULAR CAB STANDARD BOX1995-2000 GMC K25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LK2500 CREW CAB, K2500 EXTENDED CAB LONG BOX, K2500 EXTENDED CAB STANDARD BOX, K2500 REGULAR CAB1995-2000 GMC K35008 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4LK3500 CAB CHASSIS 135.5, K3500 CAB CHASSIS 159.9, K3500 CREW CAB LONG WHEELBASE, K3500 CREW CAB SHORT WHEELBASE, K3500 EXTENDED CAB, K3500 REGULAR CAB1996-2002 GMC Savana6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L, 8 Cyl 8.1L1 TON CARGO EXPRESS, 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE SAVANA, 1 TON PASSENGER, 1/2 TON CARGO, 1/2 TON CARGO EXPRESS, 1/2 TON CARGO SAVANA, 1/2 TON PASSENGER EXPRESS, 1/2 TON PASSENGER SAVANA, 3/4 TON CARGO EXPRESS, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER EXPRESS, 3/4 TON PASSENGER SAVANA1995-1999 GMC Suburban8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L1/2 TON, 3/4 TON1995-2000 GMC Yukon8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.7L, 8 Cyl 6.0L, 8 Cyl 6.5L DieselCLASSIC 2 DOOR 1/2 TON, CLASSIC 4 **Purpose of using 12475489:** **1\. Prevent Wheel Lock-Up** When you brake hard, a wheel can stop rotating while the car is still moving — this is called **lock-up**. - A locked wheel **loses traction**, causing skidding. - The ABS modulator valve rapidly **reduces and reapplies brake pressure** to that wheel to keep it rotating just enough to maintain grip. 2\. **Maintain Steering Control** Without ABS, once your wheels lock, you can’t steer — the car just slides forward. The modulator valve lets the ABS system **modulate pressure** so the tires maintain traction with the road, allowing the driver to **steer even while braking hard**. 3\. **Shorten Stopping Distance (on many surfaces)** By keeping the tires on the edge of traction, the ABS can often **reduce braking distance**, especially on **wet or slippery** roads. The modulator valve precisely controls hydraulic pressure to make this possible. 4\. **Balance Brake Force Between Wheels** Different wheels may have different traction (for example, one on ice, one on asphalt). The pressure modulator valve adjusts pressure **independently** for each wheel so each one brakes effectively without locking. 5\. **Enable Other Safety Systems** Modern vehicles integrate the ABS modulator valve with: - **Electronic Stability Control (ESC)** - **Traction Control System (TCS)** These systems rely on the modulator valve to **apply or release brake pressure automatically** to help keep the car stable. **Sings of Bad ABS Pressure Modulator Valve 12475489:** **1\. ABS Warning Light On** - The **ABS light** (or sometimes the **brake warning light**) appears on the dashboard. - This means the ABS control module has detected a fault in the system — often with the modulator valves or pump. - The car will usually still have normal braking, but **ABS won’t function** during emergencies. **2\. Brakes Lock Up Under Hard Braking** - If the modulator valve fails to release pressure properly, the wheels may **lock up** when you brake hard. - You might notice **skidding or loss of steering control**, especially on wet or slippery roads. **3\. ABS Activates When It Shouldn’t** - Sometimes, a faulty valve can cause the ABS to **engage randomly**, even during normal braking. - You’ll feel the **pulsation in the brake pedal** or hear the **ABS pump running** when it shouldn’t. **4\. Brake Fluid Leaks or Low Pressure** - Since the modulator is part of the hydraulic system, internal leaks or damaged seals can cause **brake fluid loss** or **reduced pressure** to one or more wheels. - The brake pedal may feel **soft or spongy**. **5\. Unresponsive or Hard Brake Pedal** - If the solenoid valves inside the modulator get stuck, they can block fluid flow. - This may cause the brake pedal to feel **very stiff**, making it hard to press or control braking pressure smoothly. **6\. Unusual Noises During Braking** - You may hear **clicking, buzzing, or grinding** noises coming from the ABS pump/modulator area (usually near the engine bay). - Occasional noise during ABS activation is normal — but **frequent or loud noises** without hard braking can mean a valve issue. **7\. Diagnostic Trouble Codes (DTCs)** - A scan with an **OBD-II scanner** may reveal codes like: - `C0265`, `C1214`, `C0131`, etc. — all of which can point to modulator valve or pump circuit problems.

• Brand: GM
• Manufacturer Part Number: 12475489
• Country of Origin: United States