The P1659 trouble code is a diagnostic trouble code (DTC) that indicates a malfunction in the Electronic Throttle Control System (ETCS) relay. This code is specific to certain vehicle makes, particularly Honda and Acura models. When the code is triggered, it signifies that the Powertrain Control Module (PCM) has detected an issue with the ETCS control relay power switch, which can lead to significant performance issues in the vehicle. Understanding this code is crucial for vehicle owners and DIY mechanics, as it can affect the throttle response and overall drivability of the car.
| P1659 Code Meaning | P1659 Code Common Causes |
|---|---|
| Electronic Throttle Control System Control Relay OFF Malfunction | Faulty ETCS relay |
| PCM detected a malfunction in the ETCS control relay power switch | Wiring issues or short circuits in the ETCS circuit |
| Potential throttle response issues leading to reduced engine performance | Faulty PCM or software issues |
| May cause limp mode activation | Blown fuses related to the ETCS relay circuit |
Symptoms of P1659 Code
When your vehicle triggers the P1659 code, you may observe several symptoms:
- Check Engine Light: The most common indicator is the illumination of the check engine light on your dashboard.
- Throttle Response Issues: You may experience a lack of acceleration or delayed throttle response when pressing the accelerator pedal.
- Limp Mode Activation: The vehicle might enter limp mode, limiting speed and power to protect the engine.
- Unusual Engine Behavior: Drivers may notice erratic engine behavior, including stalling or rough idling.
Technical Explanations
The P1659 code is associated with the Electronic Throttle Control System, which replaces traditional mechanical throttle linkages with electronic controls. The system relies on sensors and actuators to manage throttle position based on driver input.
When the PCM detects that the ETCS control relay is not functioning correctly, it triggers the P1659 code. This can occur due to various factors, including:
- Relay Malfunction: The ETCS relay itself may be faulty or have poor connections.
- Wiring Issues: Damaged or corroded wiring can disrupt communication between components.
- PCM Issues: In rare cases, a malfunctioning PCM may incorrectly identify a fault in the ETCS.
Step-by-Step Diagnosis
To diagnose a P1659 trouble code, follow these steps:
- Scan for Codes: Use an OBD-II scanner to confirm the presence of the P1659 code and check for any additional codes that may provide further insight.
- Inspect Fuses: Check all related fuses in both under-hood and interior fuse boxes. Replace any blown fuses.
- Examine Wiring and Connectors: Inspect wiring harnesses for signs of damage, corrosion, or loose connections that could affect the ETCS relay operation.
- Test the ETCS Relay: Using a multimeter, test the relay for continuity and proper operation. Replace if defective.
- Check PCM Functionality: If all other components are functioning correctly, consider testing or reprogramming the PCM as a last resort.
Solution Methods
Resolving a P1659 code typically involves one or more of the following solutions:
- Replace Faulty Relay: If testing reveals that the ETCS relay is defective, replace it with a new one.
- Repair Wiring Issues: Address any damaged wiring or corroded connectors found during inspection.
- Replace Blown Fuses: Ensure all relevant fuses are intact; replace any that are blown.
- Reprogram or Replace PCM: If all else fails and no other issues are found, consider reprogramming or replacing the PCM.
Cost Estimates
The cost to resolve a P1659 code can vary widely based on several factors:
- ETCS Relay Replacement: Typically costs between $50 and $150 for parts and labor.
- Wiring Repairs: Depending on complexity, repairs may range from $100 to $300.
- PCM Replacement/Reprogramming: This can be significantly more expensive, ranging from $300 to $1,200 depending on vehicle make and model.
Warnings and Recommendations
- Always ensure safety by disconnecting the battery before working on electrical components.
- If you are not comfortable performing these diagnostics or repairs yourself, seek professional assistance to avoid further damage to your vehicle.
- Ignoring this trouble code can lead to more severe engine performance issues and potentially costly repairs down the line.
Frequently Asked Questions About P1659
- What does P1659 mean?
The P1659 code indicates an Electronic Throttle Control System Control Relay OFF Malfunction. - Can I drive my car with a P1659 code?
It is not advisable to drive your vehicle as it may enter limp mode and affect drivability. - How do I fix a P1659 code?
Fixing this code typically involves checking fuses, inspecting wiring, replacing faulty relays, or addressing PCM issues. - Will clearing the code solve my problem?
Clearing the code may temporarily turn off warning lights but will not fix underlying issues. - How much does it cost to repair a P1659?
The cost can range from $50 for simple relay replacements to over $1,200 for PCM issues. - What are common symptoms of a P1659?
Common symptoms include check engine light illumination, throttle response issues, and potential limp mode activation. - Is P1659 serious?
This code indicates serious potential problems with throttle control; it should be addressed promptly. - Can I reset my check engine light after fixing P1659?
Yes, after repairs are made, you can reset your check engine light using an OBD-II scanner.
In conclusion, understanding and addressing a P1659 trouble code is essential for maintaining your vehicle’s performance and safety. By following proper diagnostic procedures and solutions outlined above, vehicle owners and DIY mechanics can effectively tackle this issue without unnecessary complications. Always prioritize safety during repairs and consult professionals when in doubt about complex electrical systems.