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.
Driveline Clunk When Stopping (Reprogram Powertrain Control Module (Pcm)) (03-07-30-028)
Reference number: 03-07-30-028
DRIVELINE CLUNK WHEN STOPPING (REPROGRAM POWERTRAIN CONTROL MODULE (PCM))
TECHNICAL SERVICE BULLETIN
| CADILLAC: | 2003 Escalade, Escalade ESV, Escalade EXT with 6.0L Engine (VINs N, U - RPOs LQ9, LQ4) and 4L65E Automatic Transmission (RPO M32) and AWD Transfer Case (RPO NR3) |
| CHEVROLET: | 2003 Suburban, Tahoe with Stabilitrak System (RPO JL4) and 4WD Transfer Case (RPO NR4) |
| GMC: | 2003 Yukon Denali, Yukon Denali XL with 6.0L Engine (VINs N, U - RPOs LQ9, LQ4) and 4L65E Automatic Transmission (RPO M32) and AWD Transfer Case (RPO NR3); or 2003 GMC Yukon, Yukon XL with Stabilitrak System (RPO JL4) and 4WD Transfer Case (RPO NR4) |
| HUMMER: | 2003 H2 with 6.0L Engine (VINs N, U - RPOs LQ9, LQ4) and 4L65E Automatic Transmission (RPO M32) and AWD Transfer Case (RPO NR3) |
| SECTION: | 07 - Transmission/Transaxle |
CONDITION
Some customers may comment on a clunk noise when stopping. This noise may occur on a 3-2 downshift at approximately 24 km/h (15 mph) and may be more noticeable on quicker stops.
CAUSE
This condition may be caused by lash in the driveline.
CORRECTION
A revised calibration has been released that will eliminate the 3-2 downshift and create a 3-1 downshift instead. Reprogram the PCM using the new service calibration, which was available from Techline starting June 2, 2003 on the TIS2000 version 6.0 or later. This calibration is an electronic calibration and is not available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
| Labor Op. | Description | Labor Time |
|---|---|---|
| K5364 | Transmission Control Module (TCM) - Reprogram | 0.4 hr |
| Add | To Diagnosis | 0.0 - 0.3 hr |
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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.
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