Reading climate control diagnostic trouble codes



The Automatic Climate Control which appeared in several models includes an easy-to-use 61-channel OBD (On Board Diagnostic) display which can be accessed without the use of special tools. This function can be an indispensable tool in diagnosing problems with the climate control system. Owners of cars without automatic climate control must have error codes read with a VAG 1551 Scan Tool.

To Access CC OBD readout:
  • Car ignition on
  • Press and hold the recirculation button
  • Press and hold the up arrow button
  • Release both buttons: "01c" will be displayed ("01c" indicates channel 1, "02c" indicates channel 2, etc.)

    To select a different channel, press temperature + or temperature - buttons.

    To call up information from a particular channel, select desired channel, and press the recirculation button.

    To leave memory display, press the AUTO button, or switch the ignition off.

    Diagnostic Channels and their descriptions

    1 System malfunction - displayed as a Diagnostic Trouble Code (DTC)
    2 Digital value of Interior Temperature Sensor, in Headliner
    3 Digital value of Interior Temperature Sensor, in Instrument Panel
    4 Digital value of Fresh Air Intake Duct Temperature Sensor
    5 Digital value of Outside Air (Ambient) Temperature Sensor, front
    6 Digital value of Outside Air (Ambient) Temperature Sensor
    7 Digital value of Ambient Temperature Sensor at Fresh Air Blower
    8 Digital value of Temperature Regulator Flap Motor Potentiometer
    9 Delta value of Temperature Regulator Flap
    10 Non-corrected specified value of Temperature Regulator Flap
    11 Digital value of Central Flap Motor Potentiometer
    12 Specified value of Central Flap
    13 Digital value of Footwell/Defroster Flap Motor Potentiometer
    14 Specified value of Footwell/Defroster Flap
    15 Digital value of Air Flow Flap Motor Potentiometer (Disregard for US/Canada models)
    16 Specified value of Air Flow Flap
    17 Vehicle Speed (km/h)
    18 Actual Fresh Air Blower voltage (Volts)
    19 Specified Fresh Air Blower voltage (Volts)
    20 A/C Compressor (A/C Clutch) voltage (Volts)
    21 Number of low voltage occurrences, non-transient
    22 Cycle condition of A/C Refrigerant High Pressure Switch
    23 Cyclings of the A/C Refrigerant High Pressure Switch
    24 Cyclings of the switches, absolute non-fluctuating
    25 Analog/Digital value, Kick-Down Switch
    26 Analog/Digital value, Engine Coolant Temperature (ECT) Warning Light
    27 Coding value
    28 Engine Speed (RPM)
    29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28)
    30 Software version
    31 Display check (all segments of A/C Control Head display light up)
    32 Potentiometer malfunction counter, Temperature Regulator Flap
    33 Potentiometer malfunction counter, Central Flap
    34 Potentiometer malfunction counter, Footwell/Defroster Flap
    35 Potentiometer malfunction counter, Air Flow Flap
    36 Feedback value, cold end-stop, Temperature Regulator Flap Motor Potentiometer
    37 Feedback value, hot end-stop, Temperature Regulator Flap Motor Potentiometer
    38 Feedback value, cold end-stop, Central Flap Motor Potentiometer
    39 Feedback value, hot end-stop, Central Flap Motor Potentiometer
    40 Feedback value, cold end-stop, Footwell/Defroster Flap Motor Potentiometer
    41 Feedback value, hot end-stop, Footwell/Defroster Flap Motor Potentiometer
    42 Feedback value, cold end-stop, Air Flow Flap Motor Potentiometer
    43 Feedback value, hot end-stop, Air Flow Flap Motor Potentiometer
    44 Vehicle operation cycle counter
    45 Calculated Interior temperature (internal software, in digits)
    46 Outside (ambient) temperature, filtered, for regulation (internal software)
    47 Outside (ambient) temperature, unfiltered, (internal software, in Celsius)
    48 Outside (ambient) temperature, unfiltered (in digits)
    49 Malfunction counter for speedometer (vehicle speed) signal
    50 Standing time (in minutes)
    51 Engine Coolant Temperature (ECT), in Celsius
    52 Graphics channel 1, see chart below. NOTE: When Diagnostic Channel 52
    is selected, .--.-. is displayed first. A/C compressor switch-off conditions
    are identified by illuminated segments of the .88.8. display.
    53 Graphics channel 2, see chart below. NOTE: When Diagnostic Channel 53
    is selected, .--.-. is displayed first. A/C system electrical outputs are
    identified by illuminated segments of the .88.8. display.
    54 Control characteristics
    55 Outside (ambient) temperature, in Celsius or Fahrenheit depending on the setting
    of the A/C control head
    56 Temperature in Celsius, from Interior Temperature Sensor, in Headliner
    57 Temperature in Celsius, from Interior Temperature Sensor, in Instrument Panel
    58 Temperature in Celsius, from Fresh Air Intake Duct Temperature Sensor
    59 Temperature in Celsius, from Outside Air (Ambient) Temperature Sensor
    60 Temperature in Celsius, from Ambient Temperature Sensor at Fresh Air Blower
    61 Software version (latest)


    Diagnostic Trouble Codes

    DTC Malfunction
    0.00 No Malfunction Present
    02.1 (G86) Interior Temperature Sensor, in Headliner, static open (*02.1)
    02.2 Interior Temperature Sensor, in Headliner, static short, see 02.1
    02.3 Interior Temperature Sensor, in Headliner, sporadic open
    02.4 Interior Temperature Sensor, in Headliner, sporadic short
    03.1 (G56) Interior Temperature Sensor, in Instrument Panel, static open, see 02.1
    03.2 Interior Temperature Sensor, in Instrument Panel, static short, see 02.1
    03.3 Interior Temperature Sensor, in Instrument Panel, sporadic open
    03.4 Interior Temperature Sensor, in Instrument Panel, sporadic short
    04.1 (G89) Fresh Air Intake Duct Temperature Sensor, static open (*04.1)
    04.2 Fresh Air Intake Duct Temperature Sensor, static short, see 04.1
    04.3 Fresh Air Intake Duct Temperature Sensor, sporadic open
    04.4 Fresh Air Intake Duct Temperature Sensor, sporadic short
    05.1 (G17) Outside Air (Ambient) Temperature Sensor, front, static open (*05.1)
    05.2 Outside Air (Ambient) Temperature Sensor, front, static short, see 05.1 (*05.2)
    05.3 Outside Air (Ambient) Temperature Sensor, front, sporadic open
    05.4 Outside Air (Ambient) Temperature Sensor, front, sporadic short
    06.1 (G110) Engine Coolant Temperature (ECT), A/C static open (*06.1)
    06.2 Engine Coolant Temperature (ECT), A/C static short, see 06.1
    06.3 Engine Coolant Temperature (ECT), A/C sporadic open
    06.4 Engine Coolant Temperature (ECT), A/C sporadic short
    07.1 (G109) Ambient Temperature Sensor at Fresh Air Blower, static open (*07.1)
    07.2 Ambient Temperature Sensor at Fresh Air Blower, static short, see 07.1
    07.3 Ambient Temperature Sensorat Fresh Air Blower, sporadic open
    07.4 Ambient Temperature Sensor at Fresh Air Blower, sporadic short
    08.1 (G92) Temperature Regulator Flap Motor Potentiometer, static open (*08.1)
    08.2 Temperature Regulator Flap Motor Potentiometer, static short, see 08.1
    08.3 Temperature Regulator Flap Motor Potentiometer, sporadic open
    08.4 Temperature Regulator Flap Motor Potentiometer, sporadic short
    08.5 Temperature Regulator Flap, static block (*08.5)
    08.6 Temperature Regulator Flap Motor Potentiometer, malfunction
    08.7 Temperature Regulator Flap, sporadic block
    11.1 (G112) Central Flap Motor Potentiometer, static open (*11.1)
    11.2 Central Flap Motor Potentiometer, static short, see 11.1
    11.3 Central Flap Motor Potentiomenter, sporadic open
    11.4 Central Flap Motor Potentiometer, sporadic short
    11.5 Central Flap, static block (*11.5)
    11.6 Central Flap Motor Potentiometer, malfunction
    11.7 Central Flap, sporadic block
    13.1 (G114) Footwell/Defroster Flap Motor Potentiometer, static open (*13.1)
    13.2 Footwell/Defroster Flap Motor Potentiometer, static short, see 13.1
    13.3 Footwell/Defroster Flap Motor Potentiometer, sporadic open
    13.4 Footwell/Defroster Flap Motor Potentiometer, sporadic short
    13.5 Footwell/Defroster Flap, static block (*13.5)
    13.6 Footwell/Defroster Flap Motor Potentiometer, malfunction
    13.7 Footwell/Defroster Flap, sporadic block
    15.1 (G113) Air Flow Flap Motor Potentiometer, static open (*15.1)
    15.2 Air Flow Flap Motor Potentiometer, static short, see 15.1
    15.3 Air Flow Flap Motor Potentiometer, sporadic open
    15.4 Air Flow Flap Motor Potentiometer, sporadic short
    15.5 Air Flow Flap, static block, see (*15.5)
    15.6 Air Flow Flap Motor Potentiometer, malfunction
    15.7 Air Flow Flap, sporadic block
    17.0 Vehicle Speed Signal faulty
    18.1 Fresh Air Blower voltage, static
    18.3 Fresh Air Blower voltage, sporadic
    20.1 A/C compressor voltage not OK - static (*20.1)
    20.3 A/C compressor voltage not OK - sporadic
    22.1 (F118) A/C Refrigerant High Pressure Switch, static open (*22.1)
    22.3 A/C Refrigerant High Pressure Switch, sporadic open
    22.5 A/C Refrigerant High Pressure Switch, 120X open (*22.5)
    29.1 Belt slip detection "soft," static
    29.2 Belt slip detection "hard," static
    29.3 Belt slip detection "soft," sporadic
    29.4 Belt slip detection "hard," sporadic


    Remarks

    *02.1 Digital default value of 128 is programmed if sensor fails
    *04.1 Value supplied by Temperature Sensor is used if sensor fails
    *05.1 Value supplied by Temperature Sensor is used if sensor fails
    *05.2 Digital default value of 128 is programmed if sensors G89 and G17 both fail
    *06.1 Engine Coolant Temperature is calculated if sensor should fail or is not
    installed; diagnosis occurs only above 0oC
    *07.1 Programmed corrective value = 0
    *08.1 Temperature Regulator Flap Motor will no longer be controlled
    automatically; manual adjustment only
    *08.5 Motor is cycled, software attempts to eliminate block
    *11.1 Central Flap Motor will no longer be controlled automatically; manual
    adjustment only
    *11.5 Motor is cycled; software attempts to eliminate block
    *13.1 Footwell/Defroster Flap Motor will no longer be controlled automatically;
    manual adjustment only
    *13.5 Motor is cycled; software attempts to eliminate block
    *15.1 Digital value is internally programmed for limp-home mode
    *15.5 Motor is cycled; software attempts to eliminate block
    *20.1 Compressor remains off until voltage is greater than 10.8V for at least 25 seconds
    *22.1 Compressor remains off until switch closes
    *22.5 Compressor re-engagement circuit, VAG 1551 Scan Tool function



    Diagnostic Channel 52 - Graphics Channel 1

    A/C Compressor switch-off conditions
    Note: if an A/C compressor switch-off condition exists, a segment of the .88.8. display, noted below as an alpha-numeric code, will il luminate.


    Segment Condition
    A1 Slippage or blockage, A/C Refrigerant High Pressure Switch, 120x off
    B1 Engine Speed (RPM) less than 200 - 500
    C1 Engine Speed (RPM) greater than 6000
    D1 Engine Speed (RPM) greater than 6000
    E1 System function OK*
    F1 System function OK*
    G1 System function OK*
    A2 A/C manually switched off (A/C standby canceled)
    B2 Low Voltage
    C2 Kick-down switch (via Transmission Control Module (TCM), compressor off for 12 seconds max.
    D2 Engine coolant temperature sensor/switch
    E2 A/C Refrigerant Low Pressure Switch (F73)
    F2 A/C Refrigerant High Pressure Switch (F118)
    G2 System function OK*
    A3 ECON mode selected
    B3 OFF selected
    C3 Outside (ambient) temperature too low
    D3 Engine management system (compressor will remain off for 3 -12 seconds)
    E3 High pressure occurrences more than 30 times
    F3 Ambient Temperature Sensor at Fresh Air Blower (G109) less than 27 degF (-3oC)
    G3 System function OK*
    Decimal Point Visible: A/C compressor ON
    Not Visible: A/C compressor OFF
    *segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK.


    Diagnostic Channel 53 - Graphics Channel 2

    Active electrical outputs
    Note: When a NO system electrical output is activated, a segment of the .88.8. display, noted below as an alpha-numeric code, will ill uminate. The decimal point in the .88.8. display will not illuminate in this channel.


    Segment Condition
    A1 Fan for interior temperature sensor
    B1 Fresh air/recirculation flap closed (recirculation mode)
    C1 Heater valve closed
    D1 Bi-directional wiring harness
    E1 A/C compressor ON
    F1 coolant fan first speed ON
    G1 System function OK*
    A2 Air flow flap open
    B2 Air flow flap open
    C2 Air flow flap closed
    D2 Footwell/Defroster flap in .Footwell. position
    E2 Footwell/Defroster flap in .Footwell. position
    F2 Footwell/Defroster flap in .Defroster. position
    G2 System function OK*
    A3 Central flap in .instrument panel outlet. position
    B3 Central flap in .instrument panel outlet. position
    C3 Central flap in .footwell outlet/defrost. position
    D3 Temperature flap in .cold air. position
    E3 Temperature flap in .cold air. position
    F3 Temperature flap in .warm air. position
    G3 System function OK*


    * Segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK