P0698 - Engine Cooling Fan Control Circuit High - Common in Ford & GM Models

Quick Answer

P0698 means: DTC P0698 indicates a high voltage condition in the engine cooling fan control circuit.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with P0698? Seek immediate diagnostic attention to prevent engine overheating.

Common Questions

What does P0698 mean and how does it affect my car?

DTC P0698 indicates that the voltage in the engine cooling fan control circuit is too high. This can lead to overheating, reduced engine performance, and potential engine damage if not addressed promptly. It’s crucial to understand that the cooling system is vital for maintaining optimal engine temperature, and any disruptions can have serious long-term effects.

What are the most common causes of P0698 and how much does it cost to fix?

Common causes include wiring issues, a faulty fan control module, or a malfunctioning ECM. Repair costs can vary widely based on the issue, ranging from $100 for wiring repairs to $500 for ECM reprogramming, depending on the extent of the damage and parts needed.

Can I drive my car with P0698 or should I stop immediately?

It's recommended to stop driving your car immediately if you see the P0698 code. Continuing to drive can lead to overheating and severe engine damage, which could result in costly repairs.

How can I diagnose P0698 myself using the GeekOBD APP?

Using the GeekOBD APP, you can perform a detailed OBD2 scan to retrieve the P0698 code. The app allows you to view freeze frame data, which helps understand the conditions under which the code was triggered. You can also monitor live data to check for abnormal readings in the cooling fan circuit.

What vehicles are most commonly affected by P0698?

DTC P0698 is often found in various Ford and GM models, particularly those manufactured between 2010 and 2020. Models such as the Ford F-150, Chevrolet Silverado, and GMC Sierra are frequently reported with this issue due to their cooling system configuration.

How can I prevent P0698 from happening again?

Regular maintenance, including inspecting wiring and connections for signs of wear, can help prevent P0698. Additionally, ensuring the cooling system is functioning properly and having periodic diagnostics performed with tools like the GeekOBD APP can help catch issues before they escalate.

What is P0698?

The Diagnostic Trouble Code (DTC) P0698 specifically refers to an issue with the engine cooling fan control circuit, indicating that the voltage level in the cooling fan control circuit is higher than expected. This code is prevalent in various vehicle models, particularly in Ford and General Motors vehicles. When the engine control module (ECM) detects this high voltage, it triggers the Check Engine light to alert the driver of a potential cooling system failure. High voltage in the circuit could lead to an improper functioning of the cooling fan system, risking overheating and subsequent engine damage. This fault can be caused by wiring issues, a faulty fan control module, or even a malfunctioning ECM. If ignored, the vehicle may experience overheating, leading to severe engine damage, costly repairs, and potential safety hazards. Understanding DTC P0698 helps car owners address cooling system problems early, ensuring vehicle longevity and reliability.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0698 is present:

  • Check engine light illuminates continuously, indicating potential issues with the cooling system.
  • Engine may overheat during operation, especially in heavy traffic or under load, causing the driver to notice temperature gauge spikes.
  • Fuel economy may decrease due to the engine running inefficiently, potentially reducing mileage by 10-15%.
  • Unusual noises from the engine compartment when the cooling fan is supposed to be operating, such as grinding or squeaking.
  • Cooling fan may run continuously, even when the engine is cool, suggesting a malfunction in the fan control circuit.

Possible Causes

Most common causes of P0698 (ordered by frequency):

  1. The most common cause of DTC P0698 is a short circuit in the wiring harness, accounting for about 60% of cases. Loose connections or damaged wires can lead to excessive voltage.
  2. A faulty fan control module is another significant cause, potentially affecting 25% of reported cases. If the module fails, it can send incorrect voltage signals to the ECM.
  3. Improperly functioning engine control module (ECM) can also trigger this code, though it's less common. Regular software updates and diagnostics can prevent this.
  4. Less common but serious causes include overheating due to external factors like a failing water pump or radiator issues, which can exacerbate the cooling system's performance.
  5. A rare cause is a short in the ignition switch or electrical system, which can potentially lead to multiple faults in the engine management system.

P0698 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring in the cooling fan control circuit.

  • Total: $100 - $300
  • Success rate: 90%
Fan Control Module Replacement

Replace the faulty fan control module to restore proper function.

  • Total: $150 - $400
  • Success rate: 85%
ECM Reprogramming

Reprogram the engine control module if it’s determined to be faulty.

  • Total: $200 - $500
  • Success rate: 75%
Money-Saving Tips for P0698
  • 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 P0698 Diagnosis Process

Follow these systematic steps to accurately diagnose P0698. 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).

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).

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 the voltage in the cooling fan control circuit (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the voltage in the cooling fan control circuit (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)

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

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 engine temperature (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor engine temperature (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: Ford F-150 Overheating Issue Resolved

Vehicle: 2015 Ford F-150, 80,000 miles

Problem: Customer reported frequent overheating and Check Engine light.

Diagnosis: OBD2 scan revealed P0698. Visual inspection found damaged wiring in the cooling fan circuit.

Solution: Repaired and replaced damaged wiring and reconnected loose connectors.

Cost: $250 (parts and labor)

Result: Customer reported no further issues with overheating; vehicle running smoothly.

Case Study 2: Chevrolet Silverado Fan Control Module Failure

Vehicle: 2018 Chevrolet Silverado 1500, 50,000 miles

Problem: Check Engine light illuminated; engine overheating.

Diagnosis: Diagnostic scan indicated P0698. Testing confirmed a faulty fan control module.

Solution: Replaced the fan control module.

Cost: $350 (including parts and labor)

Result: Customer satisfied with the quick resolution; vehicle back to optimal performance.

Diagnose P0698

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0698
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes