I was reading a long thread about this but never saw anything conclusive. My 2006 GCL pulses when going uphill. I did find some fluid leakage on a transmission fluid cooler line and the rear main. I have a P710 code. I purchased this from a used car dealer and am still within the 30 day warrantee.
The P0710 is a transmission fluid temperature sensor circuit fault. Could be the sensor, or wiring. Which engine/transmission it has? Is what you feel really a pulsing, or is for example the torque converter clutch engaging/disengaging( you would see this at the rpm, which would go up and down with the pulsing).
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