2005 Pontiac Montana SV6 3.5L - OBD Code P1516 Explanation and Troubleshooting

Please provide detailed information about your vehicle: year, model, engine type, and the exact OBD code displayed (e.g., P1516). Also clarify how the code is presented on your dashboard — for example, with spaces or without. The spacing in your message may affect interpretation. Additionally, describe any symptoms you're experiencing beyond the warning light.

I have a 2005 Pontiac Montana SV6 with a 3.5L engine. The MD display shows 'P 15 16' with spaces, and other codes include 'M F CC C O OH E'. The top-right corner reads '03 / 03'. A yellow warning light is on the dashboard — it looks like a lock around a car icon. I don't experience any noticeable driving problems such as stalling or poor performance. The only issue is the persistent yellow light. Any insight into what this means would be greatly appreciated.

Good news: I can assist with your query. Key point: The code format 'P 15 16' is not standard for OBD-II codes. This appears to be a display formatting issue caused by the carMD device — it does not represent the correct OBD-II code structure. Recommendation: - Take your vehicle to an auto parts store that offers free OBD2 scanning. Have them retrieve and interpret all stored diagnostic codes, including any monitor statuses (e.g., M F CC C O OH E). - Contact carMD's official technical support to clarify what the abbreviations 'M F CC C O OH E' represent — these may refer to specific engine monitors or test status. - The '03 / 03' reading could indicate a monitor completion status (e.g., completed on both tests), and the yellow light may signal a system warning, though it doesn't necessarily mean there's an active fault. Note: P1516 is a manufacturer-specific code, not a universal OBD-II standard. It relates to the electronic throttle control module and should be interpreted in context with other diagnostics.

P1516 is a manufacturer-specific diagnostic code related to the electronic throttle control module (ETCM). While it may not always indicate an immediate driving issue, it warrants attention. Confirm whether you are experiencing any driveability problems such as hesitation, surging, or loss of throttle response — these could help determine if the code is active or merely a warning.

The P1516 code specifically pertains to the electronic throttle control module (ETCM) in the vehicle. This component manages throttle position and engine response. While it may not always result in noticeable performance issues, a persistent warning light or stored code suggests potential malfunctions that should be investigated through professional diagnostics.