B0423 - OBD-II DTC - port

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B0423

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3. DTC B0423

Air Mix Door #2 Inoperative Error

DTC B0423, sometimes indicated as B042300, is an OBD diagnostic trouble code indicating a generic fault with the vehicle body.

• B0423: Air Mix Door #2 Inoperative Error
• B0423: Air Mix Door #2 Inoperative Error [GM/Chevrolet]
• B0423 00: Air flow control # 5 - A/C - high input signal

DTC Trouble Code Search Search Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

• 070138009 - NT:APPLIANCE:AIR CONDITIONERCHEVROLET: Ei07264 - manual hvac performance, temperature, mode, a/c does not cool, dtc B0228, B0413, B0423, B0433, B3779, B3782 *nj updated 2/15/08. *nj

Consumer Complaints for this DTC 2009 BUICK ENCLAVE with 74976.0 miles

Passenger side air vents only blow cold air when heat is selected. All other vents blow hot air. Checked and code B0423 stored. Replaced right temp actuator and reprogrammed hvac module.ENGINE, Related OBD-II Error Codes

These codes are commonly diagnosed with error code B0423.

• B3782 [1] Air flow control #10 (rear) feedback circuit malfunction [GM/Chevrolet]
• B3779 [1] Air flow control #9 (dual zone) feedback circuit malfunction [GM/Chevrolet]
• B0228 [1] Recirc position feedback circuit malfunction [GM/Chevrolet]
• B0413 [1] Temperature control #1 (main/front) feedback circuit malfunction [GM/Chevrolet]
• B0433 [1] Temperature control #3 (rear) feedback circuit malfunction [GM/Chevrolet]

Sub-Codes From Detailed OBD Scanners

Sub-Code	General Meaning	Possible Causes	Diagnostic Steps
B0423-00 / B042300	No Failure Details	N/A	No further information.
B0423-01 / B042301	Short to Battery Voltage	Wiring harness shorted to battery voltage, faulty component, damaged connector.	Inspect wiring for shorts to power, check connectors for damage, test component functionality.
B0423-02 / B042302	Short to Ground	Wiring harness shorted to ground, damaged component, faulty insulation.	Inspect wiring for shorts to ground, check component grounds, repair damaged insulation.
B0423-03 / B042303	Low Voltage	Weak battery, poor charging system, voltage drop due to resistance in wiring.	Test battery voltage, inspect alternator output, check for voltage drops in wiring.
B0423-04 / B042304	Open Circuit	Broken wire, disconnected connector, failed component.	Inspect wiring for breaks, ensure all connectors are properly seated, test component continuity.
B0423-05 / B042305	Short Circuit Between Wires	Insulation damage causing wires to touch, incorrect wiring repairs.	Inspect wiring harness for damage, repair or replace faulty wiring.
B0423-06 / B042306	Short to Positive (Other than Battery)	Wiring shorted to another positive voltage source.	Trace wiring to identify unintended voltage sources, isolate and repair wiring.
B0423-07 / B042307	Short to Negative	Wiring shorted to negative terminal or ground.	Inspect wiring for contact with ground points, repair insulation.
B0423-08 / B042308	Component Fault	Defective component, internal failure.	Test component operation, replace if necessary.
B0423-09 / B042309	Sensor Fault	Faulty sensor, sensor out of range.	Test sensor readings, compare to specifications, replace if faulty.
B0423-0A / B04230A	Circuit Intermittent	Loose connections, intermittent wiring faults.	Inspect connectors and wiring for intermittent issues, perform wiggle test.
B0423-0B / B04230B	Circuit Voltage High	Overcharging system, faulty voltage regulator.	Test system voltage levels, inspect voltage regulator and alternator.
B0423-0C / B04230C	Circuit Voltage Low	Undercharging system, excessive voltage drop.	Check battery health, inspect charging system, test for voltage drops.
B0423-0D / B04230D	High Resistance	Corroded connectors, damaged wiring, loose connections.	Inspect and clean connectors, check wiring resistance, tighten any loose connections.
B0423-0E / B04230E	Low Resistance	Shorted wires, internal component short, contamination causing short.	Inspect wiring for shorts, test component resistance, clean any contaminants.
B0423-0F / B04230F	Communication Error	Faulty communication bus, unresponsive module, wiring issues.	Check communication bus integrity, verify module operation, inspect wiring and connectors.
B0423-10 / B042310	Invalid Data Received	Faulty sensor sending incorrect data, software glitch, interference.	Test sensor output, update/reflash software, check for electrical interference.
B0423-11 / B042311	Ground Fault	Poor grounding, corroded ground connections.	Inspect ground connections, clean and secure as necessary.
B0423-12 / B042312	Control Module Fault	Defective control module, internal errors.	Perform module self-test, reprogram or replace module if faulty.
B0423-13 / B042313	Sensor Not Calibrated	Sensor installation without calibration, sensor drift.	Calibrate the sensor per manufacturer guidelines, replace if calibration fails.
B0423-14 / B042314	Component Not Programmed	New component requires programming, software mismatch.	Program the component using appropriate diagnostic equipment.
B0423-15 / B042315	Calibration Error	Incorrect calibration data, corrupted calibration files.	Recalibrate system, update software if necessary.
B0423-16 / B042316	Incorrect Component Installed	Wrong part number, incompatible component.	Verify part numbers, replace with correct component.
B0423-17 / B042317	Power Supply Error	Interruption in power supply, fuse blown, relay failure.	Check fuses and relays, test for proper voltage supply.
B0423-18 / B042318	Overcurrent Condition	Short circuit causing high current, faulty component drawing excessive current.	Inspect for shorts, measure current draw, replace faulty components.
B0423-19 / B042319	Data Bus Error	Faulty communication lines, bus contention, module malfunction.	Inspect bus wiring, check for conflicting modules, use oscilloscope for signal integrity.
B0423-1A / B04231A	Redundant Sensor Error	Discrepancy between primary and secondary sensors.	Compare sensor outputs, replace faulty sensor.
B0423-1B / B04231B	Mechanical Failure Detected	Physical damage, wear and tear, mechanical obstruction.	Perform visual inspection, test mechanical components, repair or replace as needed.
B0423-1C / B04231C	Actuator Malfunction	Faulty actuator, stuck mechanism.	Test actuator operation, inspect for mechanical binding, replace if necessary.
B0423-1D / B04231D	Signal Implausible	Sensor signal out of expected range, faulty readings.	Verify sensor signals, compare with known good values, replace sensor if faulty.
B0423-1E / B04231E	Thermistor Error	Faulty temperature sensor, wiring issues.	Test thermistor resistance, inspect wiring, replace if defective.
B0423-1F / B04231F	Configuration Error	Incorrect settings, software configuration mismatch.	Check configuration settings, update software, reconfigure as per specifications.

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