NHTSA ID Number: 10161028
Manufacturer Communication Number: PIT5687
Summary
This Preliminary information communicates some diagnostic tips to inspect for no/low voltage at the ECM for a customers complaints of a SES MIL, Crank No Start, stalling DTC’s: P16A7 and/or P16AF.
Condition
Customers may comment on a SES MIL, Crank No Start, and/or stalling concern. When checking for DTC’s, the ECM will have P16A7 and/or P16AF set.
Cause
These concerns could be caused by no/low voltage at the ECM power circuit 5290, connector X1 terminal 49. In most cases, this is due to poor terminal tension at the ECM X1 connector pin 49.
Correction:
The following information provides some diagnostic tips and does not replace SI diagnostics. As always, follow SI diagnostics.
1. Inspect ECM Fuse #86 (30 amp), in the UBEC, for being open. If the fuse is open, perform normal diagnostics by inspecting the harness for a short to ground.
2. If the fuse is not open, install a battery tender (GR8) and turn the ignition on. Verify that the battery voltage at the ECM Fuse #86 in the UBEC is greater than 12 volts. If no/low voltage is present, inspect for proper operation of the KR75 Engine Control Ignition Relay in the UBEC.
3. If battery voltage is present, turn the ignition off and gain access to the ECM X1 connector. Using the correct test probe (J-35616-35 VT) perform a terminal drag test at pin 49 of the X1 ECM connector. If the terminal is
found to have poor drag, replace it with the terminated lead listed in the SI connector end view document.
2 Affected Products
Vehicles
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5687
Published date: 05/17/2019
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SEOCONTENT-START
Bulletin No.: PIT5687
Published date: 05/17/2019
Preliminary Information PIT5687 SES MIL / No Start / Stall / DTCs P16A7 P16AF
Models Brand: Chevrolet GMC Model: Silverado 1500 (New Model) Sierra 1500 (New Model) Model Years: 2019
2019 VIN:
from to
All All
All All Engine: LV3 L82 L84 L87 LV3 L82 L84 L87 Transmissions: All All Involved Region or Country Additional Options (RPO)
Condition Cause North America
With Engine RPO LV3, L82, L84 or L87
Some customers may comment on a SES MIL, Crank No Start, and/or stalling concern. When checking for DTC’s, the ECM will have P16A7 and/or P16AF set.
These concerns could be caused by no/low voltage at the ECM power circuit 5290, connector X1 terminal 49. In most cases, this is due to poor terminal tension at the ECM X1 connector pin 49.
Correction:
The following information provides some diagnostic tips and does not replace SI diagnostics. As always, follow SI diagnostics. 1. Inspect ECM Fuse #86 (30 amp), in the UBEC, for being open. If the fuse is open, perform normal diagnostics by inspecting the harness for a short to ground. 2. If the fuse is not open, install a battery tender (GR8) and turn the ignition on. Verify that the battery voltage at the ECM Fuse #86 in the UBEC is greater than 12 volts. If no/low voltage is present, inspect for proper operation of the KR75 Engine Control Ignition Relay in the UBEC. 3. If battery voltage is present, turn the ignition off and gain access to the ECM X1 connector. Using the correct test probe (J-35616-35 VT) perform a terminal drag test at pin 49 of the X1 ECM connector. If the terminal is found to have poor drag, replace it with the terminated lead listed in the SI connector end view document.
Warranty Information
For wiring repairs covered under warranty, please refer to latest version of bulletin 10-00-89-005.
Version History
Version 1
Modifed 05/17/2019 – Created on © 2019 General Motors. All Rights Reserved.
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SEOCONTENT-END
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