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.
2002 Cadillac Escalade EXTFACTORY OEM SERVICE PROCEDURE
HVAC, Automatic DTCS
HVAC, AUTOMATIC DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Definition |
|---|---|
| DTC B0159 | Outside Air Temperature Sensor Circuit Range/Performance |
| DTC B0164 | Passenger Compartment Temperature Sensor #1 (Single Sensor or LH) Circuit Range/Performance |
| DTC B0174 | Output Air Temperature Sensor #1 Circuit Range/Performance |
| DTC B0179 | Output Air Temperature Sensor #2 (Lower; Single or LH) Circuit Range/Performance |
| DTC B0184 | Solar Load Sensor #1 CKT Range |
| DTC B0229 | Air Flow Control #7 (Recirc) Feedback Circuit Range/Performance |
| DTC B0248 | Mode Door Inoperative Error |
| DTC B0268 | Air Flow Control #7 (Recirc) Circuit Malfunction |
| DTC B0408 | Temperature Control #1 (Main/Front) Circuit Malfunction |
| DTC B0414 | Air Temperature Door Position Signal Voltage |
| DTC B0429 | Air Mix Door #3 Range Error |
| DTC B0434 | Temperature Control #3 Rear Feedback Circuit Range |
| DTC B1020 | Auxiliary ECU Malfunction |
| DTC B3531 | Air Flow Control #10 Rear Circuit Malfunction |
| DTC B3579 | Output Air Temperature Sensor #6 Circuit Range/Performance |
| DTC B3584 | Output Air Temperature Sensor #7 Circuit Range/Performance |
| DTC B3761 | Air Flow Control #3 Feedback Circuit Range/Performance |
| DTC B3764 | Airflow Control #4 Mode Feedback Circuit Malfunction |
| DTC U1500 | Communication (Front to Rear) State of Health |
Factory Service Tools
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.