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.
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HOMESERVICE MANUALSLINCOLN2009NAVIGATOR L RWDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICSDIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMDTC CHARTSHVAC MODULE - ELECTRONIC MANUAL TEMPERATURE CONTROL (EMTC) DTC CHART
2009 Lincoln Navigator L RWD
HVAC Module - Electronic Manual Temperature Control (EMTC) DTC Chart
2009 Lincoln Navigator L RWDSECTION HVAC Module - Electronic Manual Temperature Control (EMTC) DTC Chart
NOTE:
Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC CHART .
DTC DESCRIPTION
| DTC | Description | Action to Take |
|---|---|---|
| B1003 | Mode Door Circuit Failure | Go To PINPOINT TEST I . |
| B1200 | Climate Control Pushbutton Circuit Failure | Button held too long may set DTC. ATTEMPT to clean buttons. If code returns, INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| B1342 | ECU Is Faulted | INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| B1676 | Battery Pack Voltage Out Of Range | Go To PINPOINT TEST Y . |
| B2266 | Left Side Blend Door Circuit Failure | Go To PINPOINT TEST N . |
| B2826 | Front Evaporator Temp Sensor Circuit Failure | Go To PINPOINT TEST F . |
| B2827 | Front Evaporator Temp Sensor Short to Ground | Go To PINPOINT TEST F . |
| B2916 | Rear Blend Door Circuit Failure | Go To PINPOINT TEST V . |
| B2917 | Rear Mode Door Circuit Failure | Go To PINPOINT TEST W . |
| B2918 | Aux Temp Blend Input Circuit Failure | If the vehicle is not equipped with a center console and rear auxiliary climate controls, ignore the DTC and continue diagnostics. If the vehicle is equipped with a center console and rear auxiliary climate controls, Go To PINPOINT TEST X . |
| B2919 | Aux Blower Motor Speed Input Circuit Failure | If the vehicle is not equipped with a center console and rear auxiliary climate controls, ignore the DTC and continue diagnostics. If the vehicle is equipped with a center console and rear auxiliary climate controls, Go To PINPOINT TEST X . |
| U2050 | No Application Present | INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| All Other DTCs | - | REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES article. |
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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.