4DU — Primary exterior color: Royal Blue. This code identifies the vehicle's factory-applied main exterior paint color. Browse RPO codes →
I am comparing two otherwise similar vehicles. One has 4DU: “Primary exterior color: Royal Blue. This code identifies the vehicle's factory-applied main exterior paint color” How noticeable is the difference in real-world use, and are there any maintenance considerations?
0 likes
If the feature is listed but not working, scan all related modules before assuming it was removed. A stored fault, replacement module, or configuration mismatch can make original equipment appear absent.
0 likes
A window sticker is helpful for customer-facing option names, while the build sheet is usually more detailed. If they disagree, the vehicle-specific dealer equipment list can help connect the sales name to 4DU.
8 likes
If the feature is listed but not working, scan all related modules before assuming it was removed. A stored fault, replacement module, or configuration mismatch can make original equipment appear absent.
1 likes
I have seen this on a similar GMC Yukon. The basic description was correct, but one related feature was part of a separate package. I would not assume the code includes every item mentioned in marketing material.
3 likes
On these vehicles, similar descriptions can use different codes because of supplier changes or package combinations. The code itself is useful, but the VIN-specific parts catalog is better before ordering anything.
5 likes
If the feature is listed but not working, scan all related modules before assuming it was removed. A stored fault, replacement module, or configuration mismatch can make original equipment appear absent.
2 likes
If you are documenting the vehicle, save both the original wording and the readable explanation. That preserves the factory terminology while making the record understandable later.
3 likes
This thread is part of a read-only archive — replies are closed. Register or sign in to follow future discussions.