Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Regular Production Option Codes
Regular Production Option (RPO) codes are used to identify what options a vehicle is equipped from the factory. The service parts identification label is located under spare tire cover in trunk. Items displayed on label are Vehicle Identification Number (VIN), model designation, paint information and list of all production options and special equipment. For RPO codes specific to diagnosis of body control system, see REGULAR PRODUCTION OPTION CODES DEFINITION table.
| RPO Code | Description |
|---|---|
| A45 | Memory Seat, Mirror & Driver Personalization |
| B05 | Factory Armored Vehicle |
| B9Q | Factory Hearse |
| N37 | Power Tilt/Telescoping Steering Column |
| UE1 | On-Star(R) |
| UY4 | Factory Navigation System |
| V4U | Factory Limousine |
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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