NHTSA ID Number: 10190421
Manufacturer Communication Number: PIP5791
TSB/Document Date: 2021-04-19
Summary
This Preliminary information communicates to dealership technicians to perform a sweep of the coolant flow control valve and test the circuits before replacing the Engine Coolant Flow Control Valve, and to assist engineering in root causing the P2B60.
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TSB/Document ID: PIP5791
Replacement Service Bulletin Number:
MFR Communication Date: 2021-03-23
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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Bulletin No.: PIP5791
Published date: 03/23/2021
Preliminary Information
PIP5791 DTC P2B60 Engine Coolant Flow Control Valve Position
Sensor Circuit Performance
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Escalade models
2021
All
All
LM2
All
Silverado
2020 - 2021
All
All
LM2
All
Suburban
2021
All
All
LM2
All
Tahoe
2021
All
All
LM2
All
Sierra
2020 - 2021
All
All
LM2
All
Yukon models
2021
All
All
LM2
All
Involved Region or Country North America
Condition
Customer concern with SES light on. DTC P2B60 may be set
Cause
This condition is currently under investigation by engineering
Correction:
Using the GDS2 tool with software levels greater than GM Global v 2021.3.1 : Perform the following process to
evaluate if the Engine Coolant Flow Control Valve is responding. With the ignition on and the engine NOT
RUNNING, navigate to the Engine Coolant Flow Control Valve control function as illustrated below.
Slide the command from 25% (2) to 95% (3) (for Pickups), making sure to wait until the Engine Coolant Flow
Control Position (1) indicates 95% and slide it back to 25% (2). Exercise the valve 3 times to verify it is functional.
The “Engine Coolant Flow Control Valve Position” value should move to the desired value just commanded.
The GDS tool will have a slide range of only 20% - 80% (5 and 6) for an SUV. Please perform the same 3-time-slide
action for SUV and verify the Coolant Flow Control Valve position parameter (4) matches the desired position you
commanded.
If the valve is responding properly to the command, clear the P2B60 code and perform the Engine Coolant Flow
Control Valve learn function as illustrated below:
To perform the learn function: Press the “Learn” button and wait until the progress completes.
After the learn is completed, clear the codes and return the vehicle to the customer.
IF the valve does not move during the “Engine Coolant ow Control Valve” position command, inspect for
corroded terminals at the Engine Coolant Flow Control Valve Actuator connector (it's the center actuator circled
below).
1. If corrosion on the terminals is found, replace the harness connector and inspect the Flow Control Valve
Actuator pins for corrosion damage.
2. If the actuator pins are corroded, replace the connector and terminals, but DO NOT replace the Coolant
Control Valve.
3. If there is no corrosion on the connector terminals or the pins, continue with normal SI diagnostics
(PERFORM A LEARN & CLEAR THE CODES).
If no issue found with the electrical connector, check the Flow Control Valve circuits (circled in red below).
Replace Engine Coolant Flow Control Valve ONLY IF:
1. The valve fails to respond to the control function AND the circuits are NOT found to be faulty.
2. The circuits are NOT found to be faulty AND it is is the second customer visit for this condition where the
vehicle was previously released after clearing the P2B60 code with no trouble found.
Warranty Information
Warranty Information
For vehicles repaired under the Bumper to Bumper and Emissions (E) coverage, use the following labor operation.
Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
4087878
Description
Labor Time
Coolant Flow Control Valve Response Evaluation and
.4 Hours
Learn Procedure
*This is a unique Labor Operation for Bulletin use only.
Version History
Version
Modi ed
1
03-22-2021 - Created on.
© 2021 General Motors
. All Rights Reserved.
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