MotoLogic P0751, P0752 User Manual

2/22/2021 DTC P0751 or P0752 • 2008 Cadillac CTS • MotoLogic

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DTC P0751 or P0752

Applies to:

6L50/6L80/6L90

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

Note: The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System

Verification and Circuit/System Testing to identify the cause.

DTC P0751

Shift Solenoid (SS) 1 Valve Performance – Stuck OFF – Transmission Hydraulic/Mechanical Performance

DTC P0752

Shift Solenoid (SS) 1 Valve Performance – Stuck ON – Transmission Hydraulic/Mechanical Performance

Circuit/System Description

The shift solenoid (SS) 1 is part of the control solenoid valve assembly which has no serviceable parts. The control

solenoid valve assembly is attached to the lower control valve body. The solenoid operates by the TCM opening or

closing the ground circuit. With the solenoid circuit grounded (solenoid on), the internal plunger and metering ball

block the exhaust fluid creating signal fluid pressure. The signal fluid acts against the clutch select valve 2 to

overcome the valve spring force moving it to the apply position, allowing the shift. The TCM shifts the transmission

by operating the solenoids in on/off combinations.

Conditions for Running the DTC

P0751 or P0752

DTCs P0121, P0122, P0123, P0716, P0717, P0722, P0723, and P0182E are not set.

Ignition voltage is 8.6  V or greater.

The engine speed is 500 RPM or greater for 5 seconds.

The IMS range is not PARK, NEUTRAL or REVERSE.

High Side Driver (HSD) is enabled.

The transmission fluid temperature is 0–130°C (32–266°F).

Accelerator pedal position signal is valid.

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2/22/2021 DTC P0751 or P0752 • 2008 Cadillac CTS • MotoLogic

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The throttle position signal is valid.

The output shaft speed is 0 RPM or greater.

The TCM must receive a valid torque signal from the ECM.

Conditions for Setting the DTC

P0751

Commanded gear slip is 200 RPM for 1.1 seconds.

First gear locked is commanded.

The closest gear ratio is 4th gear.

P0752

Gear slip is 200 RPM or greater for 5 seconds.

Commanded gear is 3rd.

Transmission has achieved second gear.

Action Taken When the DTC Sets

DTC P0751 is a Type B DTC.

DTC P0752 is a Type A DTC.

Conditions for Clearing the DTC

DTC P0751 is a Type B DTC.

DTC P0752 is a Type A DTC.

Diagnostic Aids

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display,

monitor, and verify multiple transmission data parameters at one time, after the road test.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Description and Operation

Electronic Component Description

Transmission General Description

Transmission Component and System Description

Park - Engine Running

Reverse

Neutral - Engine Running

Drive Range, First Gear Engine Braking

Drive Range, First Gear

Drive Range, Second Gear

Drive Range, Third Gear

Drive Range, Third Gear Default

Drive Range - Fourth Gear

Drive Range, Fifth Gear

Drive Range, Fifth Gear Default

Drive Range, Sixth Gear

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