P0689 - PCM Power Relay Control Circuit Range/Performance Problem (Common in Ford, Dodge, and Jeep Models)

Quick Answer

P0689 means: P0689 indicates a problem with the PCM power relay control circuit, affecting engine performance.

Fix: Check and replace faulty components Cost: $100 - $200 Time: 90-180 minutes

Can I drive with P0689? Immediate attention is recommended to prevent further engine issues.

Common Questions

What does P0689 mean and how does it affect my car?

Code P0689 indicates an issue with the PCM power relay circuit that can lead to engine performance problems. If this code appears, you may notice symptoms such as stalling or difficulty starting your vehicle, which can significantly impact your driving experience.

What are the most common causes of P0689 and how much does it cost to fix?

The most common causes include a faulty PCM power relay, wiring issues, or a weak battery. Repair costs can range from $50 for simple wiring repairs to $1,200 for complete PCM replacement, depending on the specific repairs needed.

Can I drive my car with P0689 or should I stop immediately?

It is not recommended to drive your vehicle if you have a P0689 code, as it may lead to stalling or a breakdown, presenting safety risks. It's best to have it diagnosed and repaired as soon as possible.

How can I diagnose P0689 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan your vehicle for DTCs, view freeze frame data for context, and check the status of the PCM power relay. Monitoring voltage levels during engine operation can also help identify if the relay is faulty.

What vehicles are most commonly affected by P0689?

P0689 is frequently reported in various models, particularly 2000-2018 Ford F-Series, Dodge Ram, and Jeep Grand Cherokee. Always check for any recalls or technical service bulletins related to your specific model.

How can I prevent P0689 from happening again?

To prevent P0689 from recurring, perform regular maintenance, including battery checks, keeping connections clean, and ensuring that your vehicle's electrical system is in good condition.

What is P0689?

The diagnostic trouble code P0689 indicates an issue with the Powertrain Control Module (PCM) power relay control circuit. This code usually arises when the PCM detects a voltage problem in the relay circuit responsible for powering the engine control unit. Essentially, if the PCM isn't getting the correct power supply, it can't function properly, leading to various engine performance issues. This code is prevalent in several vehicles, especially in models from manufacturers like Ford, Dodge, and Jeep, produced between 2000 and 2018. If you see this code, it often results in the check engine light turning on, and the vehicle may experience symptoms such as stalling, misfiring, or even failing to start. In severe cases, ignoring this code can lead to more significant engine problems or reduced fuel efficiency. Therefore, it's crucial to address this code promptly to avoid further complications. You may also notice other symptoms like erratic engine behavior or abnormal fuel consumption, which can significantly affect your driving experience. If you're experiencing these symptoms, understanding what P0689 means will help you determine the next steps for diagnosis and repair.

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

Symptoms

Common symptoms when P0689 is present:

  • Check engine light illuminates and remains on, indicating an underlying issue that requires diagnosis.
  • Engine may hesitate during acceleration, causing a noticeable loss of power and responsiveness.
  • Fuel economy may decrease by 10-15%, resulting in increased fuel costs for the driver.
  • Vehicle may experience stalling while driving, posing a safety risk if this occurs unexpectedly.
  • Starting issues may arise, where the engine fails to start or takes longer than usual to turn over.

Possible Causes

Most common causes of P0689 (ordered by frequency):

  1. The most common cause of P0689 is a faulty PCM power relay, which can fail due to wear and tear over time (approximately 60% likelihood).
  2. A second possible cause is damaged wiring or connectors in the power relay circuit, which can lead to poor electrical connections or shorts.
  3. A third cause could be a weak or dead battery, affecting the overall power supply to the PCM. Keeping the battery terminals clean can prevent this issue.
  4. Less common, but serious, is the failure of the PCM itself, which may require replacement if the issue persists despite addressing other causes.
  5. A rare cause could be a manufacturing defect in the PCM, which may have been subject to recalls in certain models, particularly in older vehicles.

P0689 Repair Costs

Cost Breakdown by Repair Type

PCM Power Relay Replacement

Replacing the faulty PCM power relay with a new unit.

  • Total: $100 - $200
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or connectors in the power relay circuit.

  • Total: $50 - $150
  • Success rate: 75%
PCM Replacement

Replacing the entire PCM if it is found to be defective.

  • Total: $400 - $1200
  • Success rate: 90%
Money-Saving Tips for P0689
  • 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 P0689 Diagnosis Process

Follow these systematic steps to accurately diagnose P0689. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform an initial visual inspection - Check for damaged wiring, loose connections, or corrosion in the relay circuit (5-10 minutes)

Step 1: Perform an initial visual inspection - Check for damaged wiring, loose connections, or corrosion in the relay circuit (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: Use an OBD2 scanner, like the GeekOBD APP, to retrieve all codes and freeze frame data, helping to understand the context of the fault (10-15 minutes)

Step 2: Use an OBD2 scanner, like the GeekOBD APP, to retrieve all codes and freeze frame data, helping to understand the context of the fault (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: Conduct component testing on the PCM power relay and associated circuits using a multimeter to ensure proper voltage and continuity (20-30 minutes)

Step 3: Conduct component testing on the PCM power relay and associated circuits using a multimeter to ensure proper voltage and continuity (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: After repairs, perform a system function test to verify the proper operation of the relay and clear any stored codes (10-15 minutes)

Step 4: After repairs, perform a system function test to verify the proper operation of the relay and clear any stored codes (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: Complete a road test under various driving conditions to confirm the repair was successful and monitor for any recurring issues (15-20 minutes)

Step 5: Complete a road test under various driving conditions to confirm the repair was successful and monitor for any recurring issues (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: 2014 Ford F-150 PCM Relay Issue

Vehicle: 2014 Ford F-150, 75,000 miles

Problem: Customer reported intermittent starting issues and check engine light illumination.

Diagnosis: After using an OBD2 scanner, P0689 was identified. Physical inspection revealed a corroded power relay.

Solution: Replaced the PCM power relay and cleaned the connectors. No further issues reported post-repair.

Cost: $150 (relay and labor included)

Result: Vehicle started reliably and no check engine light appeared post-repair.

Case Study 2: 2016 Jeep Grand Cherokee Stalling Problem

Vehicle: 2016 Jeep Grand Cherokee, 60,000 miles

Problem: Vehicle stalled multiple times while driving, accompanied by a check engine light.

Diagnosis: P0689 was retrieved from the PCM, and further inspection showed damaged wiring in the power relay circuit.

Solution: Repaired the wiring harness and replaced the affected connectors.

Cost: $200 (including parts and labor)

Result: Vehicle performance improved significantly, with no further stalling incidents.

Diagnose P0689

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: P0689
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes