6.2L V8 LIFTER AND TICK DIAGNOSIS

COMMON CONCERNS: Engine Tick, Misfire Warnings, Rough Running At Cruise.

On the 6.2L, a misfire that shows up only at a light cruise lines up with the stretch where Dynamic Fuel Management shuts off cylinders. Each lifter rides on the camshaft and opens one valve. This system uses special lifters that stop opening their valves on command at light load. Lifter trouble is a reported issue on GM V8s with this system, the Escalade's 6.2L among them. When a lifter no longer follows its lobe, it leaves a valve closed or loose, which you hear as a tick and feel as a misfire.

We pull the stored code and its freeze-frame record from when the misfire set, then watch the misfire counts for each cylinder as we drive. Those counts name the cylinder that is missing and show whether each miss lands while cylinders are shut off at cruise. From that reading, we aim the repair at one cylinder and the valvetrain parts behind the tick.

ENGINE KNOCK AND OPEN RECALL LOOKUP

COMMON CONCERNS: Open Recall Questions, Engine Knock, Low Oil Pressure Warnings.

The bearings in this recall are the thin shells the crankshaft and connecting rods spin on, and the recall covers manufacturing defects in them on 2021-2024 Escalade and ESV models. When a crankshaft or rod bearing wears, the rod knocks against the crank with a deeper sound than a lifter tick. The extra clearance can also drop oil pressure enough to set a warning. This recall is unrelated to the lifter issues reported on the same engine.

At our San Ramon shop, that VIN lookup comes before the engine diagnosis. If the bearing recall is open, we flag it to you plainly, apart from our diagnosis. With the recall result in hand, we turn the diagnosis to the sound that brought you in.

10-SPEED TRANSMISSION SHIFT CONCERNS

COMMON CONCERNS: Harsh Upshifts, Jerky Downshifts, Shudder At Light Throttle.

On a 2018 or newer Escalade, the automatic has ten forward gears, so a single drive across town runs through many shifts. Harsh or jerky shifts and shudder are reported concerns on the GM 10-speed in the Escalade. You feel a harsh shift as a bang into gear from a stop, and shudder as a vibration while cruising gently.

We look at the fluid's condition, then road test your Escalade where the problem shows, reading stored codes and live shift data as we drive. That shift data names the gear change that bangs and the speed and throttle where it happens, which sets the repair we recommend.

HEAVY-DUTY BRAKE SERVICE

COMMON CONCERNS: Brake Pedal Pulsation, Grinding, Longer Stops When Towing.

With a trailer behind a loaded Escalade, the pads turn far more motion into heat on every stop, and that heat is what wears pads faster on a long grade. Enough heat can leave a rotor uneven in thickness, and you then feel the pedal pulse under your foot.

We gauge the pads, then measure each rotor's thickness at several points around its face and its runout as it spins on the hub. From those readings, we decide whether each rotor stays in service or gets replaced, with pads to match.

ELECTRICAL AND BATTERY DRAIN DIAGNOSIS

COMMON CONCERNS: Dead Battery After Parking, Repeated Jump-Starts, Electrical Warnings.

Finding the battery flat after a night parked, with nothing left on, is one sign that a control module in your Escalade stayed awake after you locked up. That shutdown can take from minutes to over an hour, and a module that stays awake drains the battery all night.

With the doors shut and the key away from the SUV, we wait for the modules to sleep, then read the current the parked Escalade still draws. When that draw stays high, we trace the circuit keeping a module awake and repair that fault. After the repair, we let the modules go to sleep again and take a second parked-draw reading to verify it.