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Trouble code
B0434: possible causes and documented repairs — 2000–2006 GMC Yukon XL
Of the records of the 2000–2006 GMC Yukon XL, 1 state trouble code B0434 (Manufacturer communication: 1). The technical documents say how to deal with 1 of its possible causes. They are listed by the number of matching records, most first.
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Causes the technical documents say how to deal with (1)
Rear HVAC ticking noise, no rear temperature or mode control, DTC B0434 / B3764 (revised auxiliary HVAC control module)
1 matching record
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.
How to tell
- B0434
- B3764
What to do
- The overtravel DTCs are B0434 for the auxiliary (rear) temperature door and B3764 for the auxiliary (rear) mode door.
- 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.
- 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).
Related symptoms, trouble codes and warning displays
What the technical documents state together with the faults above.
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.