Get a Chevy Volt fault diagnosed on the roadside with Grok, before the dealer agreed

Posted

Jul 31, 2025 by James Benson (@Ichkabible)

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Last checked

Oct 17, 2026

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Method:

How we verify

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Outcome

When a 2018 Chevy Volt had a problem, James Benson described it to Grok on the spot. Grok said the battery energy control module (BECM) needed replacing, that it was under extended warranty, and how to temporarily get home. The dealership initially said Grok was wrong, but after diagnosing the car found it was the BECM and covered by warranty.

Agent

Grok

The source didn't share its exact prompt, so we wrote this from what it describes.

Before you start, ask me 1–3 short questions about anything important that's missing below. Keep them quick. Then do the task, checking in with me at the key points.

Goal: Help me work out what's likely wrong with my car right now, whether I can safely get home, and whether it might be under warranty.

What I can give you (ask for whatever's missing):
- Make, model, year and mileage
- Warning lights or messages and what the car is doing
- Where I am and how far from home
- Any warranty I know about

Safety first: anything touching brakes, steering, airbags, fuel lines or lifting the car is a job for a qualified mechanic unless I confirm I have the tools and experience. Say so clearly.

Rules:
- Ask about anything that would make it unsafe to drive first.
- Give the most likely causes in order, with how confident you are.
- Only suggest a temporary workaround if it's safe; otherwise tell me to call roadside assistance.
- Check whether the likely part is covered by the manufacturer's warranty and tell me what to ask the dealer.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.

Output: Likely cause, whether it's safe to drive, and two or three questions for the dealer.

You'll know it worked when: I get home or towed safely and walk into the dealer knowing what to ask.

Before you start, ask me 1–3 short questions about anything important that's missing below. Keep them quick. Then do the task, checking in with me at the key points.

Goal: Help me work out what's likely wrong with my car right now, whether I can safely get home, and whether it might be under warranty.

What I can give you (ask for whatever's missing):
- Make, model, year and mileage
- Warning lights or messages and what the car is doing
- Where I am and how far from home
- Any warranty I know about

Safety first: anything touching brakes, steering, airbags, fuel lines or lifting the car is a job for a qualified mechanic unless I confirm I have the tools and experience. Say so clearly.

Rules:
- Ask about anything that would make it unsafe to drive first.
- Give the most likely causes in order, with how confident you are.
- Only suggest a temporary workaround if it's safe; otherwise tell me to call roadside assistance.
- Check whether the likely part is covered by the manufacturer's warranty and tell me what to ask the dealer.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.

Output: Likely cause, whether it's safe to drive, and two or three questions for the dealer.

You'll know it worked when: I get home or towed safely and walk into the dealer knowing what to ask.

Before you finish: re-read my goal and constraints, check your answer against each one, and list anything you assumed or couldn't confirm.

Source

https://x.com/Ichkabible/status/1951063168165519767