The P1659 trouble code is a diagnostic trouble code (DTC) that indicates an issue with the Electronic Throttle Control System (ETCS) control relay. Specifically, it signifies that the control relay is not functioning as expected, which can lead to a loss of throttle response and potentially unsafe driving conditions. This code is often associated with vehicles equipped with drive-by-wire technology, where the throttle is controlled electronically rather than mechanically. Understanding and addressing the P1659 code is crucial for maintaining vehicle performance and safety.
| P1659 Code Meaning | P1659 Code Common Causes |
|---|---|
| Electronic Throttle Control System Control Relay OFF Malfunction | Faulty Electronic Throttle Control System (ETCS) Relay |
| ETCS Relay Power Switch Malfunction | Wiring issues or poor connections in the ETCS circuit |
| Loss of Voltage to the ETCS Relay | Blown fuses affecting the ETCS system |
| PCM (Powertrain Control Module) Malfunction | Moisture or corrosion within the relay or connectors |
| Throttle Body Issues | Faulty throttle body or actuator malfunction |
Symptoms of P1659 Code
When the P1659 code is triggered, drivers may experience several symptoms that indicate a problem with the throttle control system:
- Loss of Acceleration: The vehicle may exhibit a lack of power or acceleration, making it difficult to drive safely.
- Check Engine Light: The check engine light will illuminate on the dashboard, signaling a need for diagnostic attention.
- Erratic Engine Behavior: The engine may behave unpredictably, including stalling or hesitation during acceleration.
- Reduced Throttle Response: Drivers may notice that pressing the accelerator pedal does not result in expected engine responses.
Technical Explanation
The P1659 code specifically refers to a malfunction in the Electronic Throttle Control System’s control relay. The ETCS is responsible for managing throttle position based on input from the accelerator pedal. When the control relay fails to operate correctly, it can prevent the throttle from responding appropriately, leading to various performance issues.
How the ETCS Works
The ETCS operates using sensors and actuators connected to the vehicle’s Powertrain Control Module (PCM). When you press the accelerator pedal, a signal is sent to the PCM, which then activates the throttle actuator to adjust airflow into the engine. If there is an issue with the relay that powers this system, it can result in a failure to open or close as needed.
Step-by-Step Diagnosis
Diagnosing a P1659 code involves several steps:
- Check for Additional Codes: Use an OBD-II scanner to check if there are other trouble codes present alongside P1659.
- Inspect Fuses: Examine all related fuses in both the under-hood and cabin fuse boxes for any blown fuses.
- Visual Inspection: Look for any signs of damaged wiring or corroded connectors in the ETCS circuit.
- Test ETCS Relay: Remove and test the ETCS control relay using a multimeter to ensure it operates correctly.
- Check Voltage Supply: Verify that voltage is reaching the ETCS relay when the ignition is turned on.
- Inspect Throttle Body: Check for proper operation of the throttle body and ensure there are no obstructions or mechanical failures.
- PCM Check: If all other components are functioning correctly, consider testing or replacing the PCM.
Solution Methods
To resolve a P1659 trouble code, follow these solution methods based on your diagnosis:
- Replace Faulty Relay: If testing reveals that the ETCS relay is defective, replace it with a new one.
- Repair Wiring Issues: Fix any damaged wiring or poor connections found during inspection.
- Replace Blown Fuses: Replace any blown fuses related to the ETCS system.
- Throttle Body Replacement: If issues persist after checking all components, consider replacing the throttle body if found faulty.
- PCM Reprogramming/Replacement: In cases where all else fails, reprogramming or replacing the PCM may be necessary.
Cost Estimates
The cost to diagnose and repair a P1659 code can vary significantly based on labor rates and parts prices:
- Diagnostic Fees: Expect to pay between $100 and $150 for diagnostic services at a repair shop.
- ETCS Relay Replacement: The cost for parts typically ranges from $30 to $100, plus labor costs which can add another $50 to $100 depending on your location.
- Throttle Body Replacement: If required, replacing a throttle body could cost between $200 and $600 including parts and labor.
Warnings and Recommendations
- Immediate Attention Required: If you encounter symptoms associated with P1659, such as loss of acceleration, it’s crucial not to drive until repairs are made as this could pose significant safety risks.
- Professional Help Advised: While some DIY mechanics may feel confident in troubleshooting this issue, seeking assistance from an ASE-certified technician is recommended if you’re unsure about any step in the process.
- Regular Maintenance Checks: Regularly inspect your vehicle’s electrical systems and components as part of routine maintenance to prevent issues like P1659 from occurring unexpectedly.
Frequently Asked Questions About P1659
- What does P1659 mean?
P1659 indicates an Electronic Throttle Control System Control Relay OFF Malfunction. - Can I drive my car with a P1659 code?
No, driving with this code can lead to loss of acceleration and unsafe driving conditions. - How do I clear a P1659 code?
You can clear it by using an OBD-II scanner after addressing any underlying issues. - What are common symptoms of a faulty ETCS?
Common symptoms include loss of acceleration, erratic engine behavior, and illumination of the check engine light. - Is replacing the relay enough to fix P1659?
Not always; if wiring or other components are faulty, those issues must also be addressed. - How much does it cost to fix P1659?
The total cost can range from $100 for diagnostics up to $600 depending on necessary repairs. - Can weather affect my vehicle’s ETCS?
Yes, moisture can cause relays to freeze or malfunction in cold temperatures. - Should I attempt repairs myself?
If you’re experienced with automotive repairs, you may attempt it; otherwise, professional help is recommended.
In conclusion, understanding and addressing the P1659 trouble code is essential for maintaining your vehicle’s performance and safety. By following systematic diagnostic steps and implementing appropriate solutions, you can effectively resolve this issue. Always prioritize safety by seeking professional assistance when needed and keeping up with regular vehicle maintenance.