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.
2017 Cadillac CTS Base, AWDFACTORY OEM SERVICE PROCEDURE
Cellular System, Entertainment System, And Navigation System - DTCS
CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM - DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC B0997 | Auxiliary Electronic Control Unit Performance |
| DTC B1024 (Audio Amplifier) | Circuit Board Temperature Sensor Above Maximum Threshold |
| DTC B1024 (Human Machine Interface Control Module) | Circuit Board Temperature Sensor Threshold |
| DTC B1024 (Radio) | Circuit Board Temperature Sensor |
| DTC B1025, B1135 (IO5/IO6) | Audio Output Circuit |
| DTC B1025, B1135 (IOS/IOT) | Audio Output Circuit |
| DTC B124B (IO5/IO6) | USB 1 Circuit |
| DTC B124B (IOS/IOT) | USB 1 Circuit |
| DTC B124C | USB 2 Circuit |
| DTC B124F | Universal Serial Bus (USB) Programming |
| DTC B125A | Antenna 1 Signal Circuit |
| DTC B125B | Antenna 2 Signal Circuit |
| DTC B125C | Satellite Antenna Circuit |
| DTC B125E (except IO6 with CW1) | Digital Audio Broadcast (DAB) |
| DTC B125E (IO6 with CW1) | Digital Audio Broadcast (DAB) |
| DTC B1265 | Entertainment System Remote Enable Circuit |
| DTC B1271 | Theft Protection Active |
| DTC B1277 (except IO6 with CW1) | Microphone 1 Input Signal Circuit |
| DTC B1277 (IO6 with CW1) | Microphone 1 Input Signal Circuit |
| DTC B127C | Microphone 2 Input Signal Circuit |
| DTC B127E (IO5/IO6) | Front Video Display Output Signal |
| DTC B127E (IOS/IOT) | Front Video Display Output Signal |
| DTC B12A1 (without UQT) | Audio Control Request Circuit |
| DTC B12A1 (with UQT) | Audio Control Request Circuit |
| DTC B12A3 (without UQT) | Display Control Request Circuit |
| DTC B12A3 (with UQT) | Display Control Request Circuit |
| DTC B12A7 | Optical Media Drive |
| DTC B12A8 | Optical Media Drive Theft Locked |
| DTC B1446 or B1447 (UE1 without IOS/IOT) | Backup Power Source |
| DTC B1446 or B1447 (UI3) | Backup Power Source |
| DTC B1446 or B1447 (UE1 with IOS/IOT) | Backup Power Source |
| DTC B245A | Telematics Green Indicator Circuit |
| DTC B245B | Keypad Red LED Control |
| DTC B245C | Telematics Audio Output circuit |
| DTC B2455 (without IOS/IOT) | Cellualr Phone Microphone Circuit |
| DTC B2455 (IOS/IOT) | Cellular Phone Microphone Circuit |
| DTC B2462 (IO5/IO6 with UE1/UI3) | Global Positioning System |
| DTC B2462 (without UE1/UI3, CW1) | Global Positioning System Signal |
| DTC B2462 (CW1) | Global Positioning System Signal |
| DTC B2462 (IOS/IOT) | Global Positioning System |
| DTC B2470 | Cellular Phone Antenna Circuit Malfunction |
| DTC B2476 or B2482 (UE1) | Cellular Phone Select Service Switch |
| DTC B2476 or B2482 (UI3) | Cellular Phone Select Service Switch Open |
Factory Service Tools
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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.