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C1100 on 2015-2020 Ford F-150: ABS Pump Circuit Failure Causes and Fixes

Q: Can I use a used ABS module from a salvage yard for my F-150 to fix the C1100 code?

Yes, a used module is a cost-effective option, but it must be programmed to your vehicle's VIN using a tool like FORScan or at a dealership. If not programmed, it will set a VIN mismatch code and will not function.

Q: Which fuse should I check on my 2015-2020 F-150 if I suspect an ABS power issue?

You should check fuse 53 (10A) located in the Battery Junction Box in the engine compartment, which provides power to the ABS module.

Q: My F-150 is displaying 'Service AdvanceTrac' along with the ABS light; is this related to C1100?

Yes, the 'Service AdvanceTrac' message is a known symptom of a C1100 fault, often occurring when the ABS module loses communication or internal functionality.

Q: Is there a TSB for the warped dashboard or frozen door latches on my F-150?

Yes, frozen door latches are covered under Recall 17S33 (NHTSA 17V652) and Customer Satisfaction Program 18N03. Warped dashboards are addressed in TSB 20-2268.

Q: Do I need to bleed the brakes after replacing the ABS module assembly?

Yes, if the hydraulic unit is replaced or opened, the brake system must be bled using a specific ABS service bleed procedure to ensure all air is removed from the unit.

Q: Can I just repair my existing ABS module instead of buying a new one for $1100?

Yes, you can remove the electronic portion of the module and send it to a specialized mail-in repair service, which typically costs between $150 and $350.

Code C1100 on a 2015-2020 Ford F-150 indicates an ABS Pump Motor or Switch Circuit Failure. This is often caused by a faulty ABS control module or its wiring, leading to the ABS and traction control warning lights illuminating. The fix usually involves replacing the ABS module or repairing the associated wiring, though third-party repair services for the module are a cost-effective option.

21 minutes to read 2015-2020 Ford F-150

Most Likely Cause

Faulty ABS Control Module

Difficulty

4/5

Est. Time

2.2 hrs

DIY Doable?

🔧 Shop

Shop Labor

$150 – $1500

Parts Price

$20 – $1100

⚠️ Drivable, but... — Yes, but with caution. Your truck will revert to conventional braking without ABS, meaning the wheels can lock up during a hard stop, increasing stopping distances and reducing steering control. The stability control system will also be inactive.

Key Takeaways

C1100 means your truck's ABS and stability control are disabled due to a problem with the ABS pump circuit.
Before replacing the expensive ABS module, thoroughly check the related fuses and the wiring/connector at the module for power, ground, and any signs of damage.
The most common causes are a faulty ABS control module or a wiring issue leading to it.
Consider using a mail-in repair service for the ABS module as a cost-effective alternative to buying a new one.
This is not a DIY-friendly repair for most people, as replacing the ABS module requires special procedures for bleeding the brakes and programming the new unit to the vehicle.

On a 2015-2020 Ford F-150, the diagnostic trouble code (DTC) C1100 means the Anti-lock Brake System (ABS) control module has detected a failure in the ABS pump motor circuit or its associated switch. This pump is essential for generating the hydraulic pressure needed to rapidly pulse the brakes during an emergency stop, preventing wheel lock-up. When this code is set, the ABS and traction control systems are typically disabled as a safety precaution, and the corresponding warning lights will illuminate on the dash.

What's Unique About the 2015-2020 Ford F-150

For the 13th generation F-150 (2015-2020), the C1100 code is most frequently associated with a failure of the ABS control module itself or the wiring connected to it. While fuses and the pump motor can be culprits, many owners report that the electronic module is the ultimate point of failure. Diagnostics should focus on confirming power and ground at the module's connector before condemning the expensive pump and module assembly. Unlike some other faults, this code is rarely caused by wheel speed sensors. Several companies also offer repair services for the original module, which can be a cost-effective alternative to a full replacement.

Professional service recommended: This fault disables the Anti-lock Braking and Electronic Stability Control systems, which are critical for vehicle safety in emergency maneuvers. Diagnosis and repair involve the primary brake system and may require specialized tools for bleeding the brakes and programming a new or repaired module to the vehicle's VIN.

Symptoms You May Notice

ABS warning light is illuminated on the dashboard.
Traction Control or Stability Control (ESC) warning light is on.
"Service AdvanceTrac" message may appear on the instrumen 🎬 Watch this guide on common causes for the Service AdvanceTrac lightt cluster.
Loss of anti-lock braking functionality; wheels may lock and skid during hard braking.
Loss of traction and stability control.
In some cases, the ABS pump may run continuously, even with the ignition off.
Scan tool may show no communication with the ABS module.

⚠️ Don't Waste Money on the Wrong Fix

Replacing wheel speed sensors. This code is specific to the ABS pump motor circuit, not the wheel speed sensors. Wheel speed sensor faults will set different codes (e.g., C1101, C1102, or U0415 from a wiring fault).

Most Likely Causes

Faulty ABS Control Module 🔴 High Probability The ABS module is an electronic component subject to failure from heat, vibration, and age. Several sources point to the module itself being a common point of failure for this code on F-150s, often due to internal component failure on the circuit board.
How to confirm: After verifying that power, ground, and signal wires to the module are intact and have correct voltage, the module is diagnosed by exclusion. A bi-directional scan tool may fail to communicate with it or command the pump to activate.
Typical fix: Replace the ABS control module and hydraulic unit assembly, or remove the electronic module and send it to a specialized repair service. A new or reprogrammed module must be configured to the vehicle's VIN and may require a brake bleed procedure.
Est. part cost: $600-$1100 for a new assembly, or $150-$350 for a mail-in repair service.
Open or Short in the ABS Pump Motor Circuit Wiring 🟡 Medium Probability The wiring harness leading to the ABS module is located in the engine bay and can be susceptible to damage from heat, moisture, and corrosion. Chafing against other components is a common cause of shorts or opens in the circuit.
How to confirm: Perform a visual inspection of the wiring harness for any signs of damage, chafing, or corrosion at the connector. Use a multimeter to check for continuity and voltage on the power and ground wires at the ABS module connector (C135), following a vehicle-specific wiring diagram.
Typical fix: Repair the damaged section of wiring or replace the corroded connector pigtail.
Est. part cost: $20-$100
Blown Fuse or Faulty Relay ⚪ Low Probability The ABS pump motor draws significant current and is protected by a high-amperage fuse and relay. A voltage spike or a failing pump can cause these to blow.
How to confirm: Locate the fuse box (Battery Junction Box in the engine compartment) and identify the fuses for the ABS system. Check BJB fuse 53 (10A) for the module's power supply. Visually inspect the fuse for a broken filament and test the relay's function or swap it with a known good one.
Typical fix: Replace the blown fuse or faulty relay. If the fuse blows again immediately, it indicates a short circuit that must be found.
Est. part cost: $5-$30

Rare But Worth Checking

Internal Failure of the ABS Pump Motor: While the code points to the circuit, the motor itself can fail internally, causing an electrical fault that triggers the code. Often, the motor is part of the entire ABS hydraulic control unit (HCU) and is replaced as an assembly with the module.

Diagnosis Steps

Connect an OBD-II scanner capable of reading chassis codes to confirm C1100 is present and check for any other related DTCs like B1342 or U0415.
Inspect the ABS system fuses and relays in the engine bay's Battery Junction Box. Specifically check fuse 53 (10A). Replace if blown or faulty.

🎬 Watch this quick tutorial on finding and replacing the F-150 ABS fuse

Visually inspect the ABS module connector (C135) and the entire visible length of its wiring harness for any signs of corrosion, moisture intrusion, or physical damage like chafing or melting.
Using a vehicle-specific wiring diagram, use a multimeter to test for proper battery voltage and ground at the ABS module connector. Check for voltage greater than 10V at pin 30 (circuit CBB53 GY/BN) of connector C135. Check for ground continuity (less than 5 ohms) at pins 13 and 38 (circuit GD121 BK/YE).
If possible, use a bi-directional scan tool like FORScan or Ford's IDS to command the ABS pump motor to activate. If it does not respond despite having proper power and ground, the module/pump assembly is likely faulty.
If wiring and power are good, the most likely cause is a failed ABS control module. Consider sending the module to a reputable repair service as a cost-effective alternative to full replacement.
If replacing the entire assembly or using a salvaged unit, the module must be programmed to the vehicle's VIN using a tool like FORScan or by a dealer. The brake system must then be bled using the specific ABS service bleed procedure to remove air from the hydraulic unit.

🎬 See how to perform an ABS brake bleed using FORScan

Parts You'll Likely Need

ABS Control Module / Hydraulic Assembly (OEM #FL3Z-2C215-B (supercedes FL3Z-2C215-A, for models up to 10/12/2015), HL3Z-2C219-C) — This is the most common point of failure for the C1100 code on this platform after wiring has been ruled out. The electronic module fails and can no longer control the pump motor.
Trusted brands: Motorcraft, Bosch
OEM price range: $700-$1100
Aftermarket price range: $500-$800
ABS Module Repair Service — A cost-effective alternative to replacing the entire unit. Companies can diagnose and repair the internal electronic faults on the original module, which avoids the need for programming.
Trusted brands: Circuit Board Medics, Module Master, XeMODeX
OEM price range: N/A
Aftermarket price range: $150-$350
ABS Module Connector — Corrosion or damage at the connector can cause an open or short in the circuit, triggering the code.
Trusted brands: Motorcraft, Dorman
OEM price range: $50-$100
Aftermarket price range: $30-$70

Related Codes That Often Appear With This One

B1342 (ECU is defective)
B1596 (Service Continuous Codes)
U0415 (Invalid Data Received From ABS Control Module) - Often indicates a wiring issue affecting the module's communication.
U3002 (Vehicle Identification Number Mismatch) - This will appear if a used ABS module is installed without being reprogrammed.

Mechanic-Grade Diagnostic Values

ABS Module Power Supply Voltage at Connector C135 — expected: Greater than 10 volts. Failure: Voltage less than 10V indicates an open in the power supply circuit or a blown fuse (BJB Fuse 53).
ABS Module Ground Circuit Resistance at Connector C135 — expected: Less than 5 ohms. Failure: Resistance greater than 5 ohms indicates an open or high resistance in the ground circuit (G103).
ABS Pump Motor Coil Resistance — expected: Typically a low ohm value, such as 0.2–5 Ω (exact value is vehicle-specific). Failure: An infinite reading (open) or near-zero (short) indicates a failed pump motor.

Scan Tool Commands That Help

FORScan / Ford IDS: ABS Module Configuration (AS-BUILT format) — Required when installing a new or used ABS module to program the vehicle's VIN and specific configuration into the module. Failure to do so will result in a VIN mismatch code (U3002) and prevent the system from working.
FORScan / Ford IDS: ABS Service Bleed — This is a mandatory procedure after replacing the ABS hydraulic control unit (HCU) or if air has entered the ABS pump. The function cycles the internal pump and valves to purge trapped air that cannot be removed with a conventional brake bleed.
FORScan / Ford IDS: ABS Pump Motor Actuator Test — Used during diagnosis to command the ABS pump motor to turn on. If the pump has proper power and ground but does not activate during this test, it points to a failure in the pump motor or the control module itself.

Wiring & Ground Locations

C135 — The main electrical connector on the ABS control module, located under the hood, typically attached to the hydraulic control unit near the master cylinder.. This is the primary connection point for all power, ground, and communication signals for the ABS system. All voltage and resistance tests for the module and pump circuit are performed at this connector.
G103 — A primary chassis ground point located on the left front fender.. The ABS module relies on this ground point for a clean return path. A corroded or loose G103 can cause high resistance, leading to intermittent or permanent C1100 codes. The ground circuit (BK-YE wire) at pins 13 and 38 of connector C135 terminates here.
Battery Junction Box (BJB) Fuse 53 — In the under-hood fuse box.. This 10A fuse provides the key-on power to the ABS control module via the GY-BN wire at pin 30 of connector C135. If this fuse is blown, the module will be inactive and may set a C1100 or communication code.

Real Owner Repair Stories

Ford F150 Forum (2012 F-150 (similar 12th gen platform, but diagnosis is identical)) — ABS light on, pedal fades at a stop.
❌ Tried (didn't work) Initially misdiagnosed as a master cylinder issue.
✅ What actually fixed it The user replaced the entire ABS pump/module assembly with a used unit from a salvage yard. After installation and bleeding the brakes, the pedal fade was gone, but the ABS light came on as soon as the truck moved. This indicates a successful mechanical repair but a required programming step for the electronic module.
Ford F150 Forum user SilverSTX150 (2015-2020 generation F-150) — ABS and traction control lights on.
❌ Tried (didn't work) Installing a used ABS module and programming it with FORScan cleared some codes but new codes appeared (C116A-E0), pointing to the pressure switch in the hydraulic unit (HCU).
✅ What actually fixed it The user concluded that the hydraulic control unit (HCU)/pump assembly also needed to be replaced, not just the electronic module. This highlights that while the module is a common failure, the fault can also lie within the hydraulic pump assembly it controls.

OEM Part Supersession History

FL3Z-2C215-A → FL3Z-2C215-B — Revision update by Ford.
Heads up: FL3Z-2C215-B is the correct service part for models built up to 10/12/2015. Later models use different part numbers like HL3Z-2C219-C. It is critical to match the part number or use a VIN lookup, as modules for different years or with different features (like Adaptive Cruise Control) are not interchangeable without causing further issues.

Model Year Variations Within This Range

2015-2020: While the C1100 fault is common across the generation, the specific ABS module part number can vary based on model year, drivetrain (4x2 vs 4x4), and optional features like Adaptive Cruise Control. A module from a 2018+ truck may not be compatible with a 2015-2017 truck due to differences in other vehicle systems, such as the introduction of the 10-speed transmission. Always verify part number compatibility before purchasing a replacement.

Diagnostic Flowchart

Start by confirming if C1100 (ABS Pump Motor Circuit) is the only code or if it is paired with communication errors like U0415, which often points to module failure on the F-150 platform.

Locate the Battery Junction Box in the engine compartment. Is Fuse 53 (10A) blown?

→ Replace Fuse 53. If it blows again immediately, there is a short in the CBB53 GY/BN circuit wiring or an internal short in the ABS pump motor.

Inspect the ABS module connector (C135) and harness. Is there evidence of chafing, moisture, or corrosion?

→ Repair the damaged section of the wiring harness or replace the corroded C135 connector pigtail to restore circuit integrity.

Using a multimeter at connector C135, do you have >10V at Pin 30 (GY/BN) and <5 ohms ground at Pins 13/38 (BK/YE)?

→ Trace the wiring back to the Battery Junction Box or ground points GD121. Repair the open circuit in the power or ground lines.

Using FORScan or a bi-directional tool, command the ABS Pump Motor to activate. Does the pump run?

Since power/ground are verified and the pump won't trigger, the ABS Module/Pump assembly is faulty. How do you wish to proceed?

→ Install the assembly. You MUST use FORScan or IDS to program the VIN to the module and perform the ABS service bleed procedure to remove air.

→ Remove the electronic portion of the ABS module and send it to a specialized repair service ($150-$350). This avoids the need for VIN reprogramming.

→ The fault may be intermittent. Clear codes and perform a test drive. If C1100 returns, the ABS module's internal relay is likely failing under load.

Does the scan tool fail to communicate with the ABS module entirely?

→ Verify power and ground at the module. If verified, the ABS Control Module has suffered internal electronic failure, a common issue on 2015-2020 F-150s. Replace or send for repair.