# Diagnostic commands - testbox - negative response codes (NRCs)
| Expert information
| List of the negative response codes (NRCs)
> NRC | Description
> 10 | generalReject
> 11 | serviceNotSupported
> 12 | subFunctionNotSupported-invalidFormat
> 21 | bus -repeatRequest
> 22 | conditionsNotCorrectOrRequestSequenceError
> 23 | routineNotComplete
> 31 | requestOutOfRange
> 33 | securityAccessDenied-securityAccessRequested
> 35 | invalidKey
> 36 | exceedNumberOfAttempts
> 37 | requiredTimeDelayNotExpired
> 40 | downloadNotAccepted
> 41 | improperDownloadType
> 42 | canNotDownloadToSpecifiedAddress
> 50 | uploadNotAccepted
> 51 | unproperUploadType
> 52 | canNotUploadFromSpecifiedAddress
> 53 | canNotUploadNumberOfBytesRequested
> 71 | transferSuspended
> 72 | transferAborted
> 74 | illegalAddressInBlockTransfer
> 75 | illegalBytyCountInBlockTransfer
> 76 | illegalBlockTransferType
> 77 | blockTransferDataChecksumError
> 78 | requestCorrectlyReceived-ResponsePending
> 79 | incorrectByteCountDuringBlockTransfer
> 80 | serviceNotSupportedInActiveDiagnosticMode
| Further topics:
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