Info - Quick Reference Guide for HVAC DTC Codes and HVAC Sensor and Actuator Locations
| Subject: | Quick Reference Guide for HVAC DTC Codes and HVAC Sensor and Actuator Locations |
| Models: | 2007 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2007 Chevrolet Avalanche, Suburban, Tahoe |
| 2007 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL |
The purpose of this bulletin is to provide dealers with a quick reference guide to HVAC system diagnostic trouble codes (DTCs) and HVAC sensor and actuator locations in the 2007 full-size utilities. This information supplements information found in SI.
Important: If any of the DTCs listed below is present, refer to SI for the full diagnostics for that DTC prior to replacing any component.
HVAC DTC Codes
Refer to the appropriate DTC diagnostic in SI for full information on each DTC.
DTC Number | FTB* | Description | Comments Specific to DTC |
|---|---|---|---|
B0158 | 02 | Outside Air Temperature Sensor Circuit Short to Ground | OAT sensor |
B0158 | 05 | Outside Air Temperature Sensor Circuit Short to Battery or Open | OAT sensor |
B0163 | 02 | Passenger Compartment Temperature Sensor 1 Circuit Short to Ground (Frt Headliner) | Front PCAT |
B0163 | 05 | Passenger Compartment Temperature Sensor 1 Circuit Short to Battery or Open (Frt Headliner) | Front PCAT |
B0168 | 02 | Passenger Compartment Temperature Sensor 2 Circuit Short to Ground (RR Headliner) | Rear PCAT |
B0168 | 05 | Passenger Compartment Temperature Sensor 2 Circuit Short to Battery or Open (RR Headliner) | Rear PCAT |
B0173 | 02 | Output Air Temperature Sensor 1 Circuit Short to Ground | Driver duct panel sensor |
B0173 | 05 | Output Air Temperature Sensor 1 Circuit Short to Battery or Open | Driver duct panel sensor |
B0178 | 02 | Output Air Temperature Sensor 2 Circuit Short to Short to Ground | Driver duct floor sensor |
B0178 | 05 | Output Air Temperature Sensor 2 Circuit Short to Short to Battery or Open | Driver duct floor sensor |
B0183 | 02 | Solar Load Sensor 1 Circuit Short to Ground | Driver solar sensor |
B0183 | 05 | Solar Load Sensor 1 Circuit Short to Short to Battery or Open | Driver solar sensor |
B0188 | 02 | Solar Load Sensor 2 Circuit Short to Ground | Passenger solar sensor |
B0188 | 05 | Solar Load Sensor 2 Circuit Short to Short to Battery or Open | Passenger solar sensor |
B0228 | 02 | Recirculate Position Feedback Circuit Short to Ground | Recirc actuator |
B0228 | 05 | Recirculate Position Feedback Circuit Short to Battery or Open | Recirc actuator |
B0228 | 61 | Recirculate Position actuator stuck | Recirc actuator |
B0283 | 02 | Electric Rear Defrost Circuit Short Ground | -- |
B0413 | 02 | Temperature Control 1 Feedback Circuit Short to Ground | Driver temp actuator |
B0413 | 05 | Temperature Control 1 Feedback Circuit Short to Battery or Open | Driver temp actuator |
B0413 | 61 | Temperature Control 1 actuator stuck | Driver temp actuator |
B0423 | 02 | Temperature Control 2 Feedback Circuit Short to Ground | Passenger temp actuator |
B0423 | 05 | Temperature Control 2 Feedback Circuit Short to Battery or Open | Passenger temp actuator |
B0423 | 61 | Temperature Control 2 actuator stuck | Passenger temp actuator |
B0433 | 02 | Temperature Control 3 Feedback Circuit Short to Ground | Rear temp actuator |
B0433 | 05 | Temperature Control 3 Feedback Circuit Short to Battery or Open | Rear temp actuator |
B0433 | 61 | Temperature Control 3 actuator stuck | Rear temp actuator |
B0509 | 02 | Output Air Temperature Sensor 3 Circuit Short to Ground | Passenger duct panel senor |
B0509 | 05 | Output Air Temperature Sensor 3 Circuit Short to Battery or Open | Passenger duct panel senor |
B0514 | 02 | Output Air Temperature Sensor 4 Circuit Short to Ground | Passenger duct floor sensor |
B0514 | 05 | Output Air Temperature Sensor 4 Circuit Short to Battery or Open | Passenger duct floor sensor |
B3578 | 02 | Output Air Temperature Sensor 6 Circuit Short to Ground | Rear duct panel sensor |
B3578 | 05 | Output Air Temperature Sensor 6 Circuit Short to Battery or Open | Rear duct panel sensor |
B3583 | 02 | Output Air Temperature Sensor 7 Circuit Short to Ground | Rear duct floor sensor |
B3583 | 05 | Output Air Temperature Sensor 7 Circuit Short to Battery or Open | Rear duct floor sensor |
B3779 | 02 | Air Flow Control 9 Feedback Circuit Short to Ground | Mode actuator |
B3779 | 05 | Air Flow Control 9 Feedback Circuit Short to Battery or Open | Mode actuator |
B3779 | 61 | Air Flow Control 9 actuator stuck | Mode actuator |
B3782 | 02 | Air Flow Control 10 Feedback Circuit Short to Ground | Rear mode actuator |
B3782 | 05 | Air Flow Control 10 Feedback Circuit Short to Battery or Open | Rear mode actuator |
B3782 | 61 | Air Flow Control 10 actuator stuck | Rear mode actuator |
B3933 | 02 | Air Conditioning (A/C) Evaporator Temperature Sensor Circuit Short to Ground | -- |
B3933 | 05 | Air Conditioning (A/C) Evaporator Temperature Sensor Circuit Short to Battery or Open | -- |
U0073 | Control Module Communication Bus Off | -- | |
U0020 | Low Speed Can Communication Bus Performance | -- | |
U0140 | Loss of Communication with BCM | -- | |
U0155 | Loss of Communication with IPC | -- | |
U0208 | Loss of Communication with MSM | -- | |
U0209 | Loss of Communication with HVSM | -- | |
U0249 | Loss of Communication with RSA | -- | |
U2100 | Controller Area Network (CAN) Bus Communication | -- | |
U2103 | Fewer Controllers On Bus Than Programmed | -- | |
B1000 | Electronic Control Unit (ECU) performance | -- |
* DTC Symptom Code:
02 Short to Ground
05 Short to Battery or Open
61 Actuator Stuck
Front HVAC Unit (CJ2/CJ3) Sensor and Actuator Locations
- Driver Side Panel Duct Air Temperature Sensor #1
- Passenger Side Panel Duct Air Temperature Sensor #3 (Note that the location is now actually more to the right on top of the duct similar to driver side.)
- Passenger Side Temperature Door Actuator #2
- Air Inlet Valve Actuator
- Linear Power Module
- Driver Side Temperature Door Actuator #1
- Passenger Side Heater Duct Air Temperature Sensor #4
- Driver Side Heater Duct Air Temperature Sensor #2
- Mode Door Actuator
Rear HVAC Unit (CJ2/CJ3) Sensor and Actuator Locations
- Panel Duct Air Temperature Sensor #6
- Linear Power Module
- Temperature Door Actuator (Note that the actuators are located on the outboard side of the rear HVAC unit on the Tahoe/Yukon/Denali/Escalade models)
- Mode Door Actuator (Note that the actuators are located on the outboard side of the rear HVAC unit on the Tahoe/Yukon/Denali/Escalade models)
- Floor Duct Air Temperature Sensor #7
Not Shown:
| • | Passenger Compartment Air Temp (PCAT) Sensor #1 (Not shown but in left hand side, front of headliner.) |
| • | Passenger Compartment Air Temp (PCAT) Sensor #2 (Not shown but in rear of headliner.) |
