NHTSA ID Number: 10193477
Manufacturer Communication Number: PIP5748F
Summary
This Preliminary information communicates to the technician instructions to replace the particulate matter sensor for a P1488 and to use the special labor operation for tracking purposes.
8 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CADILLAC | ESCALADE ESV | 2021 |
| CHEVROLET | SILVERADO 1500 | 2021 |
| CHEVROLET | SILVERADO 2500 | 2020 |
| CHEVROLET | SUBURBAN | 2021 |
| CHEVROLET | TAHOE | 2021 |
| GMC | SIERRA 1500 | 2021 |
| GMC | SIERRA 2500 | 2020 |
| GMC | YUKON XL | 2021 |
Condition:
The Particulate Matter Sensor Protection Tube Performance diagnostic may falsely fail, causing DTC
P1488 or P24DA to set and command the Malfunction Indicator Lamp (MIL) to illuminate.
Cause:
This condition is currently under investigation by engineering.
Correction:
If the vehicle has set DTC P1488 or P24DA, check to see if the particulate matter sensor is loose in the exhaust pipe. If so, this PI does not apply.
If the sensor is properly torqued and the P1488 or P24DA has requested the MIL, test the entire exhaust for leaks, and check for proper alignment of the tailpipe assembly to the under-floor SCR (this is a critical angle).
To test for leaks in the exhaust use the Power Smoke diagnostic leak detector (GE-52250 – refer to the latest version of PIP5684), but there are two important considerations. The smoke from the tester may not get through the DPF, so to test downstream of the DPF, administer the smoke downstream of the DPF. Also, the tailpipe sealing bladder doesn’t reach the exhaust cooler so use duct tape around the pipe to seal the cooler holes.
Repair any leaks as necessary but pay particular attention to the joint illustrated in the pictures below.
If this joint is leaking the clamp may have bottomed out before applying sufficient clamp load to the joint, or damage may have occurred from mis-alignment of the joint. Also, misalignment of the joint may contribute to the P1488/P24DA setting, even if the joint does not leak.
Separate the joint and check the witness marks for proper alignment. If the joint was found to be leaking, also inspect for deformations to either half of the joint and replace the components as necessary. If the clamp was found to be bottomed out, replace the clamp.
Be certain to remove the duct tape from the exhaust cooler.
Also replace the particulate matter sensor.
Parts Information
| Description | Part Number | QTY |
| Exhaust Clamp | 84283544 | 1 |
SEOCONTENT-START
Bulletin No.: PIP5748F Published date: 04/29/2021
Preliminary Information
PIP5748F Particulate Matter Sensor Protection Tube Performance Diagnostic May Set A False DTC P1488
or P24DA
Models
Brand:
Cadillac Chevrolet Chevrolet Chevrolet GMC GMC
Model:
Escalade Models Silverado Suburban Tahoe
Sierra
Yukon models
Model Years:
2021
2020 – 2021
2021
2021
2020 – 2021
2021
VIN:
from to
ALL ALL
ALL ALL
ALL ALL
ALL ALL
ALL ALL
ALL ALL
LM2 LM2 LM2 LM2 LM2 LM2
All All All All All All
Transmissions:
Involved Region or Country: Condition:
Cause:
Correction:
Canada only
The Particulate Matter Sensor Protection Tube Performance diagnostic may falsely fail, causing DTC
P1488 or P24DA to set and command the Malfunction Indicator Lamp (MIL) to illuminate.
This condition is currently under investigation by engineering.
If the vehicle has set DTC P1488 or P24DA, check to see if the particulate matter sensor is loose
in the exhaust pipe. If so, this PI does not apply.
If the sensor is properly torqued and the P1488 or P24DA has requested the MIL, test the entire
exhaust for leaks, and check for proper alignment of the tailpipe assembly to the under-floor SCR
(this is a critical angle).
To test for leaks in the exhaust use the Power Smoke diagnostic leak detector (GE-52250 – refer to
the latest version of PIP5684), but there are two important considerations. The smoke from the
tester may not get through the DPF, so to test downstream of the DPF, administer the smoke
downstream of the DPF. Also, the tailpipe sealing bladder doesn’t reach the exhaust cooler so use
duct tape around the pipe to seal the cooler holes.
Repair any leaks as necessary but pay particular attention to the joint illustrated in the pictures
below.
If this joint is leaking the clamp may have bottomed out before applying sufficient clamp load to
the joint, or damage may have occurred from mis-alignment of the joint. Also, misalignment of the
joint may contribute to the P1488/P24DA setting, even if the joint does not leak.
Separate the joint and check the witness marks for proper alignment. If the joint was found to be
leaking, also inspect for deformations to either half of the joint and replace the components as
necessary. If the clamp was found to be bottomed out, replace the clamp.
Be certain to remove the duct tape from the exhaust cooler. Also replace the particulate matter
sensor.
Note: This PI will be updated or replaced by a bulletin as additional information becomes
available.
Please ensure you use the special labor operation for this concern.
These witness marks indicate proper alignment
These witness marks indicate improper alignment
Parts Information
DescriptionPart Number QTY
84283544 1
Warranty Information
For vehicles repaired under the Emissions (E,E2) coverage, use the following labor operation.
Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation: Description:
Labor Time:
4087528 Exhaust Particulate Sensor Replacement
.4 Hours ADD Diagnostic Time (includes inspection)
0 – .5 Hours
*This is a unique Labor Operation for Bulletin use only.
Version History
Version 6
08/20/2020 – Created on.
09/25/2020 – Updated to include inspecting for an exhaust leak and add pictures.
Modified
10/20/2020 – Updated to modify the exhaust pipe sealing procedure. 11/18/2020 – Updated to provide
exhaust alignment details 12/11/2020 – Updated to add models
01/08/2021 – Updated to add 2021 model year Silverado and Sierra 04/28/2021 – Updated to remove US
but keep Canada
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5748F
Published date: 04/29/2021
MC-10193477-9999.pdf 1002.572KB
NHTSA ID Number: 10185730
Manufacturer Communication Number: PIP5748D
Summary
This Preliminary information communicates to the technician instructions to replace the particulate matter sensor for a P1488 and to use the special labor operation for tracking purposes.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5748D
Published date: 12/11/2020
MC-10185730-9999.pdf 1002.488KB
NHTSA ID Number: 10184133
Manufacturer Communication Number: PIP5748C
Summary
This Preliminary information communicates to the technician instructions to replace the particulate matter sensor for a P1488 and to use the special labor operation for tracking purposes.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5748C
Published date: 11/20/2020
MC-10184133-9999.pdf 1027.286KB
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