there is no 4P00... All 4000 codes are listed below
I'm, gonna guess the status was 4D00 (delayed) with a sub status of "MP" (missing parts)
tagging 
@Rob  since he was baffled as well
| 4000 | Avail to Ship | 
| 4104 | Bailment Invoice | 
| 4106 | Release Bailment | 
| 4110 | Invoice Reject | 
| 4120 | Internal Invoice | 
| 4150 | Original Invoice | 
| 4200 | Shipped | 
| 4250 | Ocean Dispatched 
NOTE: This event code is applied to an order if the Vehicle Transportation and Information Management System 42 event record has an NAIPC Selling Source and Port-of-Exit in the Originating CDL. | 
| 4300 | Intermediate Delivery | 
| 4350 | At Port of Exit – Truck 
NOTE: This event code is applied to an order if the Vehicle Transportation and Information Management System 43 event record has an NAIPC Selling Source and Port-of-Exit in the Destination CDL. | 
| 4800 | Rail Ramp Unload | 
| 4850 | At Port of Exit – Rail 
NOTE: This event code is applied to an order if the Vehicle Transportation and Information Management System 48 event record has an NAIPC Selling Source and Port-of-Exit in the Destination CDL. | 
| 4B00 | Bayed Avail to Ship | 
| 4B01 | Arrived at Vehicle Distribution Center | 
| 4B10 | Available for Export Shipping 
NOTE: This event code is applied to an order if the Vehicle Transportation and Information Management System 4B event record has an NAIPC Selling Source and Port-of-Exit in the Originating and/or Destination CDL. | 
| 4B11 | Available for Sale | 
| 4B12 | Argentina Built Order Ready for Re-Invoice to Mexico | 
| 4B31 | Anticipated Tag | 
| 4B40 | Grounded Tag | 
| 4B42 | Untag | 
| 4B45 | Credit Rebill Rejected | 
| 4B50 | Final Dealer Assigned by Central Office | 
| 4B60 | Credit Rebill Sent to Vehicle Billing and Accounts Receivable System | 
| 4B65 | CDO Requests Created (GM International Sales Only) | 
| 4B70 | Credit Rebill Cancelled in Vehicle Billing and Accounts Receivable System | 
| 4D00 | On Hold | 
| 4DCR | Carrier Reject | 
| 4F01 | Vehicle Arrived at Central Distribution Center | 
| 4F02 | In Transit to Regional Distribution Center | 
| 4F03 | Vehicle Arrived at Regional Distribution Center | 
| 4F04 | Vehicle Tagged In Transit to Dealer | 
| 4FCR | Invoice Reject | 
| 4FUN | Credit Dealer/Undo Invoice | 
| 4V01 | Vehicle at Upfitter | 
| 4V02 | Vehicle on Transportation Hold | 
| 4V03 | Estimated Delivery Date Updated |