GM Service Manual Online
For 1990-2009 cars only

Transmission Line Pressure Gauge Adapter - keywords gage information

Subject:Transmission Line Pressure Gauge Adapter

Models:2009 Cadillac Escalade
2008-2009 Chevrolet Tahoe Two-Mode Hybrid
2008-2009 GMC Yukon Two-Mode Hybrid
Equipped With A 2ML70 Transmission RPO M99



This PI was superceded to add models and years. Please discard PIP4433.


The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

When preforming diagnosis on the vehicles listed above equipped with the 2ML70 transmission it may be necessary to check the main fluid pump or auxiliary fluid pump pressure. Technicians may find that they are unable to attach a pressure gauge.

Recommendation/Instructions:

To attach the pressure gauge to the transmission it will be necessary to use adapter fitting J45056. This adapter was originally released to aid in pressure testing the Allison LCT1000 transmission and includes an o-ring type seal. This tool is currently available through Kent-Moore Tools.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.