Bulletin No.: PIP5790B
Published date: 04/7/2022

Preliminary Information
PIP5790B ECM Connector Terminals Corroded Contaminated with
Coolant Oil DTC MIL Stall Crank No Start Drivability Mis re Rough
Run
Product Investigation Review Required
Models
Brand:

Model:

Model Years:

VIN:
from

Engine:

to

Transmissions:

Cadillac

ATS

2013 - 2019

All

All

2.0 LTG and 2.5 LCV

All

Cadillac

CTS

2014 - 2019

All

All

2.0 LTG and 2.5 LCV

All

Involved Region or Country North America

Condition

Cause

Vehicle may exhibit intermittent MIL illumination, vehicle may also exhibit stalling,
cylinder mis re or crank no start all conditions typically with any combination of
codes.
Some of these codes may be and are not limited to: P0014 P0013 P0017 P0192
P0236 P0237 P0300 P0335 P0336 P0340 P0341 P0365 P0366 P0420 P0452 P0641
P2096 P2123 P2138 P2227 P2228 P2618.
The ECM connectors X1, X2 and / or X3 may have more than one corroded terminal
due to electrical fretting.
The connector(s) may not have any corroded terminals and may be contaminated
with coolant or engine oil.

Correction:
If you have one or more of the conditions mentioned above and possibly additional DTCs not listed, perform the
following.
Disconnect all three ECM connectors X1, X2 and X3 from the ECM.
Remove the terminal guide from each of the three ECM connectors so all the metal terminals can be seen.
With a bright light, inspect all the terminals for green corrosion, coolant or oil in all three connectors regardless of
what diagnostic trouble codes you have.
NOTE: Every terminal in all three ECM connectors MUST be inspected. If circuits are corroded or liquid
contaminated, those circuits can back feed into other circuits that are not corroded and set diagnostic trouble
codes for those systems they are associated with.

Corroded Terminals:
Any terminal that has signs of green corrosion on them need to be replaced with terminated leads.
Do NOT clean the terminals as you will NOT be able to clean the contact area and will have poor connections and
set codes intermittently.

Solder all terminated leads and cover with shrink tubing. Do NOT use crimp connectors to splice the circuits
together.
If the ECM terminals inside the ECM socket have corrosion on them, the ECM must be replaced.

Coolant Contaminated Connector:
If there is coolant seen in any ECM connector, look to see if the engine coolant temperature sensor circuits are in
that connector.
If they are, unplug the engine coolant temperature sensor connector and inspect it for signs of coolant.
If it has signs of coolant in it, replace the engine coolant temperature sensor, the engine coolant temperature
sensor connector, all the associated circuits and terminated leads all the way into the ECM connector.
Solder all terminated leads and cover with shrink tubing. Do NOT use crimp connectors to splice the circuits
together.
If the coolant source is not from the coolant wicking up the engine coolant temperature circuits and into the ECM,
inspect the coolant reservoir and "Y" hose located above the ECM for leaks. Replace reservoir or "Y" hose as
needed.
If the coolant was leaking down onto the ECM from the reservoir or "Y" hose, the ECM may have to be replaced
depending how coolant saturated the ECM and ECM sockets are.
Shake the ECM and listen for any coolant inside the ECM sloshing around. Replace the ECM if coolant is heard
inside the ECM.
If coolant is not heard inside the ECM and only in the ECM socket, clean the ECM sockets out with electrical
contact cleaner and blow out with compressed air.

Engine Oil Contaminated Connector:
If there is engine oil seen in any ECM connector, look to see if the engine oil pressure sensor circuits are in that
connector.
If they are, unplug the engine oil pressure sensor connector and inspect it for signs of engine oil.
If it has signs of engine oil in it, replace the engine oil pressure sensor, the engine oil pressure sensor connector,
all the associated circuits and terminated leads all the way into the ECM connector.
Solder all terminated leads and cover with shrink tubing. Do NOT use crimp connectors to splice the circuits
together.
Inspect the ECM connector socket for any signs of engine oil. If there is engine oil seen, use electrical contact
cleaner and compressed air to clean the socket.
If the ECM socket is saturated with engine oil and it is suspected it has entered inside the ECM, replace the ECM.
Corroded Terminals In ECM Connector As Seen With Terminal Guide Removed

Terminal Guide That Was Removed From Connector

Coolant "Y" Hose From Coolant Reservoir

Coolant "Y" Hose Leak

NOTE: This PI will be updated or changed to a bulletin as more information becomes available.

Parts Information
Description

Part Number

Terminated Lead At ECM
Sensor, Engine Coolant Temperature
Connector, Engine Coolant Temperature
Sensor
Module, Engine Control
Wire, TXL / GXL Primary Wire

Quantity
1
1

Refer to EPC

1
1
1

Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Note: Emission Warranty Coverage Code E applies to Labor Operation 4087658

Labor Operation
4087658 (*)
Add Time
Add Time
Add Time
Add Time
Add Time

Description
Labor Time
Repair wiring / connectors due to coolant / oil
0.0 - 1.0 Hrs.
contamination
Replace engine coolant temperature sensor
2.0 Hrs.
Replace surge tank inlet hose
0.7 Hrs.
Replace oil pressure sensor
3.0 Hrs.
Replace ECM
0.9 Hrs.
To ll coolant system
0.3 Hrs.
*This is a unique Labor Operation for Bulletin use only.

Version History
Version
Modi ed

3
03/17/2021 - Created on.
01/05/2021 - Added P0300 and P2096
04/07/2022 - Added Emissions warranty coverage and CTS vehicles

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