Experiencing car troubles after unexpected events like flooding can be incredibly frustrating. For owners of a 2015 Chevy Traverse, encountering OBD2 codes after such an incident is a common concern. This article delves into a real-world scenario faced by a Chevy Traverse owner and explores the complexities of diagnosing and resolving 2015 Obd2 Codes, particularly those related to electrical systems and emissions.
The Initial Challenge: Flood Damage and Mysterious OBD2 Errors
The story begins with a salvaged 2015 Chevy Traverse LT, a vehicle that unfortunately experienced flood damage and was marked as non-running. Upon initial inspection, the owner thankfully found no signs of water contamination in the oil or transmission fluid. An initial OBD2 scan was surprisingly clear of codes, offering a glimmer of hope. However, the optimism was tempered by the discovery of extensive mud contamination in the engine bay, particularly within the fuse box. Further investigation revealed a crucial “CRNK” relay with clipped power leads, explaining the initial no-start condition.
After meticulous cleaning, fuse replacement, and battery installation, the Traverse roared back to life. Yet, this victory was quickly followed by the dreaded engine light and the appearance of four persistent OBD2 codes. These codes, specifically P135A, P135B, P1682, and P0443, were flagged as “PERMANENT” by the OBD2 reader, raising concerns about their severity and potential diagnostic challenges.
Understanding the 2015 OBD2 Codes and Potential Causes
Let’s break down each of these 2015 OBD2 codes and explore their potential implications for a 2015 Chevy Traverse, especially in the context of flood damage:
P135A & P135B: Ignition Coil Supply Voltage Circuit Banks 1 & 2
These two codes point towards issues within the ignition coil supply voltage circuits for both engine banks. For a 2015 vehicle, this often suggests problems with:
- Wiring and Connectors: Floodwater can cause corrosion and damage to wiring harnesses and connectors, disrupting the voltage supply to the ignition coils. This is a prime suspect given the mud contamination in the fuse box.
- Fuses and Relays: While a clipped relay was initially addressed, other related fuses or relays in the ignition system could be compromised or corroded due to water exposure.
- Ignition Coils: Although less likely to fail simultaneously across both banks, the coils themselves could have been affected by moisture or electrical surges.
- ECM/PCM (Engine Control Module/Powertrain Control Module): In more severe cases, water damage could extend to the ECM/PCM, leading to misinterpretations of sensor signals or failures in voltage regulation.
P1682: Ignition 1 Switch Circuit 2
Code P1682 indicates a problem with the Ignition 1 Switch Circuit 2. This circuit is critical for providing power to various engine management systems when the ignition is turned on. Potential causes in a 2015 vehicle, especially post-flood, include:
- Ignition Switch Malfunction: The ignition switch itself might have been damaged by water or corrosion, leading to intermittent or complete failure of Circuit 2.
- Wiring Issues: Similar to the ignition coil codes, wiring and connectors associated with the Ignition 1 Switch Circuit 2 could be corroded or damaged.
- Fuse/Relay Problems: A dedicated fuse or relay for this circuit might be faulty or affected by corrosion.
P0443: Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit
The P0443 code relates to the Evaporative Emission (EVAP) Purge Solenoid Valve Control Circuit. This system prevents fuel vapors from escaping into the atmosphere. For a 2015 model year vehicle, common causes for this code include:
- Purge Solenoid Valve Failure: While the owner confirmed the solenoid clicked when powered, this doesn’t rule out internal electrical faults or blockages within the valve itself. Floodwater could introduce debris into the EVAP system.
- Wiring and Connectors: Again, wiring and connectors leading to the purge solenoid valve are susceptible to corrosion and damage.
- Vacuum Line Leaks: Although the code is circuit-related, issues within the EVAP system, such as vacuum leaks caused by damaged lines, can sometimes trigger electrical circuit codes indirectly.
Troubleshooting and Diagnostic Steps for 2015 OBD2 Codes
Given these 2015 OBD2 codes and the history of flood damage, a systematic troubleshooting approach is essential. Here are key steps the Chevy Traverse owner, or anyone facing similar issues with a 2015 vehicle, should consider:
- Thorough Visual Inspection: Re-inspect the fuse box, wiring harnesses, and connectors in the engine bay for any remaining mud, corrosion, or damage. Pay close attention to the areas around the ignition coils, ignition switch, and EVAP purge solenoid valve.
- Fuse and Relay Check: Double-check all fuses and relays related to the ignition system and engine management. Replace any that show signs of corrosion or damage, even if they appear intact. Consult the 2015 Chevy Traverse owner’s manual for fuse and relay locations.
- Wiring Diagram Review: Obtain a wiring diagram for a 2015 Chevy Traverse, specifically focusing on the circuits related to the reported OBD2 codes. This will be invaluable for tracing circuits and identifying potential breaks or shorts.
- Voltage and Continuity Testing: Use a multimeter to test for proper voltage and continuity in the circuits related to the ignition coils, ignition switch, and EVAP purge solenoid valve. Compare readings to specifications if available.
- Component Testing: If wiring and power supply seem correct, consider testing the individual components. For example, test the resistance of the ignition coils and the EVAP purge solenoid valve.
- Professional Scan Tool Diagnosis: While a basic OBD2 reader provides code information, a professional-grade scan tool can offer more in-depth diagnostics, including live data monitoring and potentially pinpoint tests for specific circuits and components.
- ECM/PCM Inspection (Last Resort): If all other troubleshooting steps fail, and there’s strong suspicion of ECM/PCM damage due to flooding, a professional inspection of the ECM/PCM might be necessary. However, this should be considered a last resort due to the complexity and cost involved.
Addressing “Permanent” OBD2 Codes on a 2015 Vehicle
The OBD2 reader indicating “PERMANENT” codes simply means these are confirmed fault codes that the system is continuously detecting. They will not clear until the underlying issue is resolved and the system verifies the repair. Simply clearing the codes with a reader will not fix the problem and is unlikely to be successful while the fault persists. Focus should be on diagnosing and repairing the root cause of each code.
Conclusion: Persistence and Systematic Diagnosis are Key
Dealing with 2015 OBD2 codes after flood damage, as experienced by this Chevy Traverse owner, requires patience and a systematic approach. By understanding the potential causes of codes P135A, P135B, P1682, and P0443 in the context of a 2015 vehicle and following a logical diagnostic process, it’s possible to pinpoint the issues and restore the vehicle to proper working order. Remember to prioritize safety, consult repair manuals and wiring diagrams, and don’t hesitate to seek professional help when needed. Addressing these 2015 OBD2 codes effectively will ensure the longevity and reliable performance of the Chevy Traverse.
