R42 - Routing Number / Check Digit Error (ENR only)
The routing number in an ENR entry is invalid or its check digit fails validation.
R42 - Routing Number / Check Digit Error (ENR only)
The routing number in an ENR entry is invalid or its check digit fails validation. This rejection is recoverable: correct the cause and the same payment can be resubmitted.
What this code means
The routing number in an ENR entry is invalid or its check digit fails validation.
Typical causes
- Transposed digits in the routing number of the enrolment
- Check digit fails 3-7-1 modulus-10 validation
- Routing number retired or never assigned
What to do
ENR-only code. Correct the routing number (ABA 3-7-1 check digit) and re-submit the enrolment.
What it looks like in an ACH return
The return arrives as an Addenda Record (type 99), 94 characters wide. The return reason code sits in positions 4-6.
799R42091000010000001 09100001 091000019000001Tools for this code
Decode a real status report, or check a payment file before you send it — all in your browser, nothing uploaded.
Related codes
Source: Nacha ISO 20022 mapping guide + Federal Reserve ACH Return Reason Report + US Treasury Green Book · Last verified: 2026-07-13
Checked against: nacha.org · frbservices.org · fiscal.treasury.gov