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01/10/2025 9:01 pm
Topic starter
2003 honda pilot 232k miles Car starts fine check engine light came on a week ago but now after 10 minutes driving ,vtm4 comes on begins to run ruff if ac comes on car stalls one mechanic shoulld do smoke test not sure if vtm4 light issue is a cascading problem from emisson issue.
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04/10/2025 2:22 am
Yes — likely an **engine issue causing the VTM-4 light** to come on secondarily. The VTM-4 just disables AWD when the engine runs poorly.
✅ **Next steps:**
* **Read the check engine code first** — that’s the root cause.
* **Smoke test** is smart to find **vacuum or intake leaks**.
* Rough running + stalling with A/C on often means **vacuum leak, bad IAC valve, or misfire**.
Fix the engine code first — the VTM-4 light will clear once the engine runs properly.
