---
title: How Do I Diagnose a No-Crank Condition on a CNG Chassis When No Power Is Reaching the Starter?
description: Step-by-step diagnosis for a CNG chassis with a no-crank/no-start condition when start-command power is not reaching the starter.
---

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# How Do I Diagnose a No-Crank Condition on a CNG Chassis When No Power Is Reaching the Starter?

## Diagnose a no-crank condition caused by the CNG fill-cap starter interlock, including single-fill and dual-fill configurations.

**Use this diagnostic procedure when a CNG chassis has a no-crank/no-start condition and testing confirms no start-command power is reaching the starter. The procedure covers single-fill and dual-fill configurations and provides step-by-step testing to isolate the circuit failure, identify the root cause, complete the repair, and verify proper starting operation.**

**Article:** [CNG\_Fill\_Cap\_Starter\_Interlock\_Diag\_RevA](https://service.battlemotors.com/hubfs/CNG_Fill_Cap_Starter_Interlock_Diag_RevA.pdf?hsLang=en)

 

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