Can a loose fuel cap in Changan Kalam cause the check engine light to turn on?

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Can a loose fuel cap in Changan Kalam cause the check engine light to turn on?

In Pakistan, mechanics often point out that even a slightly loose cap can trigger the warning light. How common is this issue among Kalam drivers?

Zarnish asked on 24 Jun 2025 17:16:28 pm

1 Answer

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Car Mechanic Expert - on 24 Jun 2025 17:20:22 pm

Yes. The engine control module ECM in the Changan Kalam monitors the fuel tank pressure as part of its evaporative emissions system. A loose cap disrupts this seal and may trigger the CEL with a small evap leak o r fuel vapor system error.

Pakistani mechanics frequently report this, and many owners notice the check engine light disappears after tightening o r replacing the cap.

It’s a very common issue among Kalam owners, especially in hot and humid cities.