GMC Yukon XL 2000–2006
Common on this vehicle:NoiseWarning light
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3 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.
Read the records one by one (3)
Known issuesElectronic transfer case stops shifting with no DTC (shift abuse lock out mode, normal)1
Manufacturer communication2000–2006 GMC YUKON XL ・ 2006-12-01
Electronic transfer case stops shifting with no DTC: shift abuse lock out mode
1Fault
- The electronic transfer case may stop shifting and not set any DTCs.
2Finding the cause
Possible causes
- This occurs if the transfer case control module senses repeated shift requests in a short period of time.
- The transfer case control module software has a shift abuse lock out mode to protect the module and the encoder motor.
- If the driver shifts into and out of different modes continuously, the module stops trying to shift for several seconds to prevent abuse damage.
3Correction
Repair
- Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
Read the sentences of the record
From the manufacturer’s document
- Applies to：The information applies to 1999-2007 vehicles including GMC Yukon, Yukon Denali and Yukon XL with RPO NR4, NP1 or NP8 transfer case.
- Condition：The electronic transfer case may stop shifting and not set any DTCs.
- Cause：This occurs if the transfer case control module senses repeated shift requests in a short period of time.
- Cause：The transfer case control module software has a shift abuse lock out mode to protect the module and the encoder motor.
- Cause：If the driver shifts into and out of different modes continuously, the module stops trying to shift for several seconds to prevent abuse damage.
- Repair：Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
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
- Transfer Case Won’t Shift This information applies to 1999-2007 Cadillac Escalade, Chevrolet Avalanche, Trailblazer, Colorado, Blazer, S10, Silverado, Suburban, Tahoe, GMC Canyon, Envoy, Sierra, Yukon, Yukon Denali, Yukon XL, Jimmy, Sonoma, Suburban, Hummer H2 and H3 with RPO NR4, NP1, or NP8 Transfer Case. The electronic transfer case may stop shifting and not set any DTCs. This condition will occur if the transfer case control module senses repeated shift requests in a short period of time. The software in the transfer case control module has a shift abuse lock out mode to protect the module and encoder motor. If the driver tries to shift into and out of different modes continuously, the transfer case control module will stop trying to shift for several seconds to prevent abuse damage to occur. Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
No component category2
Manufacturer communication2003 GMC YUKON XL ・ 2003-01-01
Transfer case applications and normal 4WD operating characteristics (NVG 246 EAU for 2003)
1Fault
- The active 4-wheel drive system gives the driver five choices: 2 HI, Auto 4WD, 4 HI, 4 LO and neutral.
2Finding the cause
Steps to confirm (in the document’s order)
- One way to decide whether a noise or condition is unusual or typical is to operate a similar vehicle under similar conditions.
3Correction
Caution
- Driven in 4-HI or 4-LO these vehicles can also crow-hop; in Auto, the clutch pack compensates for the different driveshaft speeds.
Read the sentences of the record
From the manufacturer’s document
- Applies to：The transfer case table lists RPO NP8 for the Silverado/Sierra, Tahoe/Yukon, Suburban/Yukon XL and Avalanche, 2003: the NVG 246 EAU, a 2-speed active, selectable transfer case with the new electrical architecture.
- Condition：The active 4-wheel drive system gives the driver five choices: 2 HI, Auto 4WD, 4 HI, 4 LO and neutral.
- Caution：Driven in 4-HI or 4-LO these vehicles can also crow-hop; in Auto, the clutch pack compensates for the different driveshaft speeds.
- Confirm：One way to decide whether a noise or condition is unusual or typical is to operate a similar vehicle under similar conditions.
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
- All-Wheel Drive and 4-Wheel Drive NP8 Silverado/Sierra, Tahoe/Yukon, Suburban/Yukon XL, Avalanche, 2003 NVG 246 EAU 2-speed active t-case, selectable, new electrical architecture This system provides the driver with five choices: 2 HI, Auto 4WD, 4 HI, 4 LO, and neutral (fig. 5) . When driven in 4-HI or 4-LO, these vehicles can experience crow hopping as well. However, when driven in Auto, the operation of the clutch pack compensates for different driveshaft speeds. One way to determine if a noise or condition is unusual or typical is to operate a similar vehicle under similar conditions.
Manufacturer communication2000–2002 GMC C/K PICKUP AND UTILITY MODELS (YUKON XL) ・ 2002-06-01
Revised DTC B2725 (NVG 236/246 transfer case) (bulletin 02-04-21-003)
1Fault
2Finding the cause
Not stated
3Correction
Read the sentences of the record
From the manufacturer’s document
- Applies to：Bulletin 02-04-21-003, revised DTC B2725, lists 1999-2002 Chevrolet and GMC C/K Pickup and Utility Models, the 1999-2000 Cadillac Escalade and the 2002 Cadillac Escalade and Escalade EXT with the NVG 236/246 transfer case (RPO NP8).
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
- Bulletins – May 2002 02-04-21-003; Revised DTC B2725; 1999- 2002 Chevrolet and GMC C/K Pickup and Utility Models, 1999-2000 Cadillac Escalade, 2002 Cadillac Escalade, Escalade EXT with NVG 236/246 Transfer Case (RPO NP8)