Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Sunroof Or Sunshade Inoperative, DTC U151B Set (PI1470)
Reference number: PI1470
SUNROOF OR SUNSHADE INOPERATIVE, DTC U151B SET
TECHNICAL SERVICE BULLETIN
| AFFECTED MODEL(S): | 2010-2015 Buick LaCrosse; 2011-2015 Buick Regal, Chevrolet Cruze; 2012-2015 Buick Verano, Chevrolet Malibu; 2015 Chevrolet Impala; Equipped with Sunroof (RPO C3U or CF5) |
CONDITION/CONCERN
Some customers may comment that the sunroof or sunshade is inoperative when the sunroof switch is pressed.
When checking for DTCs, the BCM may report U151B current or in history.
RECOMMENDATION/INSTRUCTIONS
Engineering is aware of this condition and working on a software calibration change. Once a solution becomes available, this PI will be updated. In the meantime, the technician can complete the following procedure to resolve the concern.
- If the BCM is confirmed to be reporting DTC U151B, remove the sunroof fuse for 10 seconds.
- Install the sunroof fuse.
- Using the first detent on the sunroof glass switch (manual mode), open the sunroof glass fully.NOTE: Do not use the express open position of the switch.
- Using the first detent on the sunroof glass switch (manual mode), close the sunroof glass fully.NOTE: Do not use the express close position of the switch.
- If equipped, using the first detent on the sunroof sunshade switch (manual mode), open the sunroof sunshade fully.NOTE: Do not use the express close position of the switch.
- If equipped, using the first detent on the sunroof sunshade switch (manual mode), close the sunroof sunshade fully.NOTE: Do not use the express close position of the switch.
- Verify that the sunroof glass and sunshade (if equipped) now functions properly.
WARRANTY INFORMATION
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
| Labor Operation | Description | Labor Time |
|---|---|---|
| 4069929 | Reset Sunroof - Remove Fuse | Use Published Labor Operation Time |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.