Kod ini salah.

Malay often omits the copula (the verb to be) in simple present-tense sentences.

So:

• Kod ini salah = This code is wrong
• literally: code this wrong

This is completely normal in Malay. You do not need a separate word for is here.

In Malay, demonstratives like ini (this) and itu (that) usually come after the noun.

So:

• kod ini = this code
• buku itu = that book

This is one of the most important word-order differences from English.

Kod means code and is a borrowing from English. Depending on context, it can mean:

• computer/programming code
• a code number
• a system of symbols or rules

In Kod ini salah, it most naturally means this code is wrong/incorrect.

Salah usually means:

• wrong
• incorrect
• mistaken

In this sentence, it means the code is incorrect or not right.

Be aware that salah can also mean at fault or guilty in other contexts, for example:

• Siapa yang salah? = Who is at fault?

So the exact shade of meaning depends on context.

Yes, it is natural and grammatical.

It is a simple, direct way to say that the code is wrong. Depending on context, a speaker might also say things like:

• Kod ini tidak betul = This code is not correct
• Kod ini ada ralat = This code has errors
• Kod ini silap = This code is mistaken/wrong (less common in some contexts than salah)

But Kod ini salah is perfectly fine.

The pattern is:

• Noun + demonstrative + adjective

So here:

• kod = noun
• ini = demonstrative
• salah = adjective

Malay often uses this kind of structure very directly, without articles and without to be.

Malay does not normally use articles like a, an, or the.

So kod can mean:

• a code
• the code
• just code

The context tells you which one is meant. In Kod ini, the ini already makes it specific: this code.

Not if you want to mean This code is wrong.

The natural form is:

• Kod ini salah

If you say:

• Ini kod yang salah

that means something more like:

• This is the wrong code
• This is the code that is wrong

So the word order changes the meaning.

A simple approximation is:

• kod → like code but shorter
• ini → ee-nee
• salah → sah-lah

So altogether:

• kod ee-nee sah-lah

A few notes:

• k and d are clearly pronounced
• i is usually like ee
• a in salah is like the a in father, not like the English cat

Sometimes, yes, but they are not always identical.

Very roughly:

• salah = wrong / incorrect
• silap = mistaken / in error, sometimes with a sense of having made a mistake

For a sentence about code, salah is usually the safer and more common choice if you mean the code is simply incorrect.

You would usually add tidak before the adjective:

• Kod ini tidak salah = This code is not wrong

So:

• salah = wrong
• tidak salah = not wrong

This does not mean correct in every situation; it only says it is not wrong.

Not exactly.

• Kod ini salah = This code is wrong
  The code itself is incorrect.

• Ini kod yang salah = This is the wrong code
  You are identifying one code as the wrong one.

English can make these sound similar, but Malay distinguishes them more clearly through structure.