MetaMask Crypto Wallet Error Code Transaction May Fail: How to Fix It

Easy 5-15 minutes Medium Severity Verified June 2026
Summarize with ChatGPTSummarize with ClaudeSummarize with Perplexity Add as Preferred Source on Google
Error Code
Transaction May Fail
Brand
MetaMask
Product Type
crypto_wallet
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
5-15 minutes
The 'Transaction May Fail' warning in MetaMask appears when the wallet predicts your transaction will likely fail or revert, usually due to insufficient gas fees, contract issues, or network congestion. This warning helps prevent you from losing gas fees on failed transactions.
Ad

Tools You'll Need

How to Fix Error Code Transaction May Fail

  1. Check Your ETH Balance for Gas Fees

    Never share your private keys or seed phrase with anyone when adding funds to your wallet.

  2. Increase Gas Limit and Gas Price

  3. Wait for Better Network Conditions

  4. Verify Contract Interaction Details

    Always verify contract addresses from official sources to avoid interacting with malicious contracts.

  5. Reset MetaMask Transaction Nonce

    Resetting your account will clear transaction history and custom tokens from the interface, but won't affect your actual holdings.

  6. Try a Different RPC Endpoint

  7. Use MetaMask Simulation Feature

Ad

When to Call a Professional

Contact MetaMask support if the error persists after trying all steps, or consult with the smart contract developers if the issue appears to be contract-specific. Consider using alternative wallets if MetaMask continues having simulation issues.

Frequently Asked Questions

Why does MetaMask show 'Transaction May Fail' warning?
MetaMask simulates transactions before execution and shows this warning when it predicts the transaction will revert, helping you avoid losing gas fees on failed transactions.
Can I ignore the 'Transaction May Fail' warning?
You can proceed despite the warning, but there's a high chance your transaction will fail and you'll still lose the gas fees paid for the failed transaction.
How much should I increase the gas limit to fix this error?
Typically increase the gas limit by 10-20% from MetaMask's suggestion. For complex smart contract interactions, you might need to increase it by 30-50%.
Will resetting my MetaMask account delete my crypto?
No, resetting your account only clears transaction history and custom tokens from the interface. Your actual cryptocurrency holdings remain safe on the blockchain.
What causes high gas fees that trigger this warning?
Network congestion, complex smart contract interactions, and high demand for block space all contribute to increased gas costs that can trigger transaction failures.

Related Error Codes