C0704 - ABS Control Module Malfunction in Common Vehicles Like Ford and Chevrolet

Quick Answer

C0704 means: C0704 indicates a malfunction in the ABS control module, affecting braking performance.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with C0704? Immediate attention is recommended to ensure safe braking.

Common Questions

What does C0704 mean and how does it affect my car?

The C0704 code indicates a malfunction in the ABS control module, which can severely affect your vehicle's braking system. If this code appears, your ABS may not activate during hard braking, increasing the risk of skidding or loss of control, especially in adverse weather conditions.

What are the most common causes of C0704 and how much does it cost to fix?

Common causes of C0704 include a faulty ABS control module, damaged wiring, or malfunctioning wheel speed sensors. Repair costs can range from $100 for wiring repairs to $800 for ABS module replacement, depending on the severity of the issue.

Can I drive my car with C0704 or should I stop immediately?

While it's possible to drive with the C0704 code, it is not advisable. The ABS may not function properly, which can lead to unsafe driving conditions. It's best to have your vehicle inspected as soon as possible to prevent accidents.

How can I diagnose C0704 myself using GeekOBD APP?

Using the GeekOBD APP, you can perform a diagnostic scan of your vehicle to retrieve the C0704 code. Look for freeze frame data to assess the conditions under which the code was triggered. This app can also help clear the code after repairs.

What vehicles are most commonly affected by C0704?

Vehicles like the 2005-2010 Ford F-150, 2006-2011 Chevrolet Silverado, and the 2007-2014 Toyota Camry frequently experience the C0704 code. Always check for any recalls or technical service bulletins (TSBs) related to ABS issues.

How can I prevent C0704 from happening again?

Regular maintenance is key to preventing C0704. Ensure routine inspections of your ABS system, keep electrical connections clean and dry, and replace any worn parts promptly. Consider using the GeekOBD APP to monitor your vehicle's health regularly.

What is C0704?

The diagnostic trouble code (DTC) C0704 indicates a malfunction within the Anti-lock Braking System (ABS) control module. When this code is triggered, it typically signifies that the vehicle's ABS is not functioning correctly, which can lead to compromised braking performance and increased risk of skidding during emergency stops. The ABS control module is responsible for regulating brake pressure to prevent the wheels from locking up during hard braking scenarios. In terms of real-world implications, if your vehicle has a C0704 code, the ABS warning light may illuminate on your dashboard. While the vehicle may still be driveable, the absence of proper ABS functionality means you could face significant safety risks, especially in slippery conditions. This code is commonly found in various makes and models, particularly in Ford and Chevrolet vehicles produced between 2005 and 2015. If this code appears, it's essential to address it promptly to ensure the safety of both the driver and passengers. Ignoring this DTC might lead to more extensive brake system damage or costly repairs down the line.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0704 is present:

  • The ABS warning light remains illuminated on the dashboard, indicating a system fault.
  • You may notice a decrease in braking performance, particularly under hard braking conditions, where the ABS should activate.
  • Drivers often experience unusual vibrations or pulsations in the brake pedal during normal braking, which can be indicative of ABS malfunction.
  • In some cases, the vehicle may skid or exhibit difficulty stopping on slippery surfaces, compromising safety.
  • Inconsistent brake performance may lead to increased stopping distances, making it crucial to address the issue.

Possible Causes

Most common causes of C0704 (ordered by frequency):

  1. The most common cause of the C0704 code is a faulty ABS control module, with about 60% likelihood. This can happen due to electrical issues, water damage, or manufacturing defects.
  2. Another possible cause is corroded wiring or connections within the ABS system, which can lead to signal loss or shorts; this accounts for roughly 25% of related issues.
  3. A malfunctioning wheel speed sensor may also trigger the C0704 code, as it provides critical data to the ABS module for brake control; preventive measures include regular inspections.
  4. Less commonly, software glitches in the ABS control module can cause this code, which might require a software update or reprogramming to resolve.
  5. In rare cases, a failed power supply to the ABS control module can result in the C0704 code, necessitating thorough electrical diagnostics.

C0704 Repair Costs

Cost Breakdown by Repair Type

ABS Control Module Replacement

Replacing the faulty ABS control module with a new or refurbished unit.

  • Total: $300 - $800
  • Success rate: 90%
Wheel Speed Sensor Replacement

Replacing malfunctioning wheel speed sensors that often contribute to the C0704 code.

  • Total: $150 - $400
  • Success rate: 80%
Wiring Repair

Repairing corroded or damaged wiring associated with the ABS system.

  • Total: $100 - $300
  • Success rate: 75%
Money-Saving Tips for C0704
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional C0704 Diagnosis Process

Follow these systematic steps to accurately diagnose C0704. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes). Look closely at the ABS harness.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes). This will provide additional insights into the vehicle's history.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, such as the ABS control module and wheel speed sensors (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, such as the ABS control module and wheel speed sensors (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes) to ensure the issue is resolved

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes) to ensure the issue is resolved.

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor the ABS functionality (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor the ABS functionality (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: ABS Control Module Replacement on 2010 Ford F-150

Vehicle: 2010 Ford F-150, 85,000 miles

Problem: Customer reported the ABS warning light was on and experienced reduced braking efficiency.

Diagnosis: After scanning with the GeekOBD APP, the C0704 code was confirmed. A visual inspection revealed corrosion on the ABS control module.

Solution: Replaced the ABS control module and performed a system reset with the GeekOBD APP.

Cost: $650 (parts: $500 for the module, $150 for labor)

Result: Post-repair road test confirmed full ABS functionality, and the warning light was cleared.

Case Study 2: Wheel Speed Sensor Issue in 2012 Chevrolet Silverado

Vehicle: 2012 Chevrolet Silverado, 72,000 miles

Problem: Customer noticed the ABS light on and experienced brake pulsation.

Diagnosis: Diagnosis revealed the C0704 code. Testing indicated a faulty rear wheel speed sensor.

Solution: Replaced the rear wheel speed sensor and cleared the codes using the GeekOBD APP.

Cost: $250 (parts: $100 for the sensor, $150 for labor)

Result: Successful repair with no further warning lights, and the customer reported improved braking performance.

Diagnose C0704

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C0704
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes