In this comprehensive guide, we will delve into the details of the P0699 DTC code. We will explore what the code signifies, common causes that trigger this code, symptoms associated with it, and the possible ways to diagnose and fix the issue. So, if you’ve encountered the P0699 DTC code on your vehicle’s diagnostic system, fret not! We have got you covered.
The P0699 Diagnostic Trouble Code (DTC) is an OBD-II code that indicates a problem with the engine control module (ECM)/powertrain control module (PCM) relay control circuit high. This code is read by the onboard diagnostic system when it detects an electrical issue within the relay control circuit.
To effectively troubleshoot the P0699 DTC code, it is crucial to understand the potential causes behind it. Here are some common culprits:
Faulty ECM/PCM Relay: A malfunctioning ECM/PCM relay can often trigger the P0699 code. The relay may fail due to electrical issues or general wear and tear.
Wiring or Connector Problems: Damaged or loose wiring, as well as faulty connectors, can disrupt the relay control circuit’s proper functioning. Corrosion and short circuits are common issues that can affect the electrical connections.
ECM/PCM Failure: In some cases, the P0699 code may indicate a more serious problem with the ECM/PCM itself. This could be due to internal faults or a malfunction in the control module.
While the check engine light (CEL) will illuminate when the P0699 DTC code is triggered, there may be other symptoms that you can observe. These symptoms can vary depending on the vehicle make and model. Here are a few common signs to watch out for:
Rough idling or stalling: If there are issues with the ECM/PCM relay control circuit, you may experience rough idling or even complete engine stalling.
Reduced engine performance: The P0699 code can lead to a decrease in engine power, resulting in sluggish acceleration or poor overall performance.
Difficulty starting the vehicle: Faulty relay control circuitry can make it hard to start the engine, leading to extended cranking time or repeated attempts before the engine fires up.
Proper diagnosis is crucial to address the P0699 DTC code effectively. Here are steps you can take to diagnose and fix the issue:
Visual Inspection: Begin by inspecting the ECM/PCM relay, wiring, and connectors for any visible signs of damage or loose connections. Look for frayed wires, corrosion, or burnt spots that may disrupt the electrical flow.
Use a Scan Tool: Connect a suitable scan tool to your vehicle’s OBD-II port to retrieve detailed information about the code. This will also help identify any additional related codes and provide critical data for diagnosis.
Test the Relay Circuit: Measure the resistance across the ECM/PCM relay control circuit using a multimeter. Compare the readings against the manufacturer’s specifications to determine if the circuit is functioning properly.
Check Power and Ground Connections: Ensure that the power and ground connections associated with the relay control circuit are secure and free from corrosion. Clean or tighten connections as necessary.
Replace Faulty Components: If any components, such as the ECM/PCM relay or damaged wiring, are found to be faulty during the diagnosis, they should be replaced with new ones. Be sure to follow the manufacturer’s guidelines and use OEM parts when possible.
Clear the Code: After resolving the issue, use the scan tool to clear the P0699 code and any related trouble codes. This will reset the vehicle’s system and turn off the check engine light.
Can I continue driving with the P0699 DTC code? It is generally recommended to avoid driving a vehicle with a persistent check engine light, as it indicates an underlying issue. While the P0699 code itself may not have an immediate impact on driving safety, it is essential to address the problem promptly to prevent further damage and ensure optimal vehicle performance.
Can a DIY enthusiast fix the P0699 DTC code? If you have a good understanding of automotive systems and feel confident working with electrical components, you can attempt to fix the P0699 code yourself. However, it is crucial to follow the diagnosis and repair procedures outlined in the vehicle’s service manual or consult with a professional mechanic for guidance.
Can a loose gas cap trigger the P0699 DTC code? No, the P0699 code is specific to an issue with the ECM/PCM relay control circuit. A loose gas cap may trigger a different code, such as P0442 for an evaporative emission system leak. However, if you have multiple codes present, it is best to diagnose each one separately to identify and address all underlying problems.
In conclusion, the P0699 DTC code indicates an issue with the ECM/PCM relay control circuit high. By following the diagnostic steps outlined in this article and addressing any underlying problems, you can effectively fix the issue and restore your vehicle’s performance. Remember to exercise caution when working with electrical components and seek professional assistance if needed.
Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.
