High exhaust back pressure

[Waterloo]

Mr Hag, Griffin GA... I also found this on QuickServe for the 2350... Technical Service Bulletin: TSB150071 Released Date: 20-Jan-2017

Symptom:

Fault Code(s) 2973, 122, 123, 124, or 125.
Root Cause:

New intake manifold pressure/temperature sensor, Part Number 2897333 and 2897334, were released in July 2014. The capacitor in the new intake manifold pressure/temperature sensor is not completely covered in protective silicone gel, leaving the capacitor exposed. Moisture intrusion from water spray and water/ice accumulation on the air intake manifold can cause corrosion and incorrect sensor readings.
Note : This issue does not affect obsolete intake manifold pressure/temperature sensor, Part Number 2872784 or 4921322.

Use INSITE™ electronic service tool to check for active or inactive Fault Code(s) 2973, 122, 123, 124, or 125.
If any fault codes listed above are present, remove intake manifold pressure/temperature sensor and confirm part number is 2897333 or 2897334. Part number can be found on connector.

If part number is 2897333 or 2897334, locate 16-digit serial number on intake manifold pressure/temperature sensor connector. See Figure 2 below.
For part number 2897334, if serial number is 91514383xxxxxxxx or above, published troubleshooting should be resumed. If serial number is 91514382xxxxxxxx or below, reference Resolution section below.
For part number 2897333, if serial number is 56514383xxxxxxxx or above, published troubleshooting should be resumed. If serial number is 56514382xxxxxxxx or below, reference Resolution section below.

Part number 2897334
91514383xxxxxxxx and above
OK
91514382xxxxxxxx and below
Not OK

Part number 2897333
56514383xxxxxxxx and above
OK
56514382xxxxxxxx and below
Not OK

If issue has been verified and intake manifold pressure/temperature sensor serial number range status is Not OK per Table 1, replace with part number 2897334 or 2897333, which has a serial number status that is OK per Table 1.

Note : Obsolete intake manifold pressure/temperature sensor, Part Number 2872784, can also be used to replace intake manifold pressure/temperature sensor, Part Number 2897334. Obsolete intake manifold pressure/temperature sensor, Part Number 4921322, can also be used to replace intake manifold pressure/temperature sensor, Part Number 2897333.