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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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2 conditions added

Common on this vehicle:Air conditioning or heaterNoiseWarning light

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1 records state a cause or a remedy. Each record is shown as short labels in the order fault → finding the cause → correction. Press a label to narrow to the records that state it.

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Known issuesRear HVAC ticking noise, no rear temperature or mode control, DTC B0434 / B3764 (revised auxiliary HVAC control module)1

  1. Manufacturer communication2003–2006 GMC YUKON ・ 2007-02-01

    Rear HVAC ticking noise, no rear temperature or mode control, DTC B0434 / B3764: revised auxiliary HVAC control module

    1. 1Fault

      • The concerns are an intermittent ticking or clicking noise from the rear HVAC system, being unable to control the rear system temperature, and being unable to change the rear system modes.
      • A defaulted door stays at the default position until the code is cleared; clearing the code lets it operate properly until overtravel occurs again.

    2. 2Finding the cause

      Possible causes

      • The HVAC actuators may hunt for the correct commanded position, and this cycling can cause a clicking or ticking noise.
      • Overtravel of the HVAC system control doors can cause the listed conditions; when it occurs a DTC sets and the door goes to a preset default position.

      Steps to confirm (in the document’s order)

      • The overtravel DTCs are B0434 for the auxiliary (rear) temperature door and B3764 for the auxiliary (rear) mode door.

    3. 3Correction

      Repair

      • Replace the auxiliary (rear) HVAC control module; it contains a new calibration that compensates for the actuator overtravel and the hunting, clicking and ticking noises.

      Parts

      • For all 2003-06 with CJ2 and C69, the auxiliary HVAC control module is part number 15832319.
      • The second design rear blower control module is 89024926 for Tahoe, Yukon and Escalade (short wheelbase) and 89018846 for Suburban, Yukon XL and Escalade ESV (long wheelbase).

      Part numbers printed in the document

      The numbers are as the document prints them. The name and the replacing number are what the pages of GMPartsGiant, a reseller of genuine parts and not GM, state. Aftermarket equivalents are not checked here (the links only search by number). Confirm the fit for the vehicle (VIN) before ordering.

      Caution

      • With the new module the rear blower speed may rise slightly (approximately 50 rpm); if the customer objects, the blower control module may be replaced with the second design blower control module.
      • Do not use the revised auxiliary HVAC control module unless one or more of the listed codes is set; it will not correct any other DTC or A/C performance concern.
    Read the sentences of the record

    From the manufacturer’s document

    • Applies to：The article concerns some 2003-06 Cadillac Escalade, Chevrolet Suburban and Tahoe, and GMC Yukon models with RPO CJ2 and C69.
    • Condition：The concerns are an intermittent ticking or clicking noise from the rear HVAC system, being unable to control the rear system temperature, and being unable to change the rear system modes.
    • Cause：The HVAC actuators may hunt for the correct commanded position, and this cycling can cause a clicking or ticking noise.
    • Cause：Overtravel of the HVAC system control doors can cause the listed conditions; when it occurs a DTC sets and the door goes to a preset default position.
    • Condition：A defaulted door stays at the default position until the code is cleared; clearing the code lets it operate properly until overtravel occurs again.
    • Confirm：The overtravel DTCs are B0434 for the auxiliary (rear) temperature door and B3764 for the auxiliary (rear) mode door.
    • Repair：Replace the auxiliary (rear) HVAC control module; it contains a new calibration that compensates for the actuator overtravel and the hunting, clicking and ticking noises.
    • Parts：For all 2003-06 with CJ2 and C69, the auxiliary HVAC control module is part number 15832319.
    • Caution：With the new module the rear blower speed may rise slightly (approximately 50 rpm); if the customer objects, the blower control module may be replaced with the second design blower control module.
    • Parts：The second design rear blower control module is 89024926 for Tahoe, Yukon and Escalade (short wheelbase) and 89018846 for Suburban, Yukon XL and Escalade ESV (long wheelbase).
    • Caution：Do not use the revised auxiliary HVAC control module unless one or more of the listed codes is set; it will not correct any other DTC or A/C performance concern.

    Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

    Remedy
    Rear HVAC System Conditions Owners of some 2003-06 Cadillac Escalade, Chevrolet Suburban and Tahoe, and GMC Yukon models with RPO CJ2 and C69 may have one or more of the following concerns: - Intermittent ticking/clicking noise from rear HVAC system - Unable to control rear system temperature - Unable to change rear system modes The HVAC actuators may hunt for the correct commanded position. This cycling can cause a clicking or ticking noise. Overtravel of the HVAC system control doors can cause one or more of the listed system conditions. If overtravel occurs, a DTC sets and the door goes to a preset default position. When a system door defaults, that door stays at the default position until the code is cleared. Clearing the code allows the door to operate properly until the overtravel condition re-occurs. B0434 Auxiliary (rear) temperature door B3764 Auxiliary (rear) mode door Replace the auxiliary (rear) HVAC control module (part number listed in the table below). This module contains a new calibration to compensate for the actuator overtravel condition and the hunting/clicking and ticking noises. All 2003-06 with CJ2 and C69 Module, Auxiliary HVAC control 15832319 When using the new auxiliary HVAC control module, you may notice a slight increase in rear blower speed (approximately 50 rpm). If the customer comments that the increase in blower speed is objectionable, the blower control module may be replaced with the second design blower control module to correct the slight increase in blower speed. Tahoe, Yukon, Escalade (short wheelbase) Second design rear blower control module 89024926 Suburban, Yukon XL, Escalade ESV (long wheelbase) Second design rear blower control module 89018846 TIP: The revised auxiliary HVAC control module should not be used unless one or more of the codes listed above is set. The revised control module will not correct any other DTC or A/C performance concern.