Four problems related to transmission fluid leaking have been reported for the 2003 Chevrolet Trailblazer. The most recently reported issues are listed below.
Transmission cooler lines spring a small pin hole leak. Leak directly under power steering pump. Lines cause transmission to slip and have very hard time shifting into next gear. Truck would almost red line. Can cause internal damage to transmission if kept driving. Truck has sat for 6 months now. Can cause an accident if transmission loses to much fluid.
The contact owns a 2003 Chevrolet Trailblazer ext. While the contact was driving approximately 20 mph, the steering wheel became stiff and extremely difficult to maneuver. The transmission previously leaked an excessive amount of fluid. The vehicle was taken to an independent mechanic where the power steering and transmission lines were replaced at different times. The manufacturer was notified of the failure. The approximate failure mileage was 78,000.
Transmission fluid leak caused by corrosion similar to TSB #pit-4722. Fluid seen on driveway when car parked. Fluid on undercarriage. Transmission oil coolant lines will have to be replaced at approximately $500 cost. Design issue for part to corrode after only 6 years.
Driving on vacation towing camper. Tried to accelerate and nothing. Got to gas station. No trans fluid. Got it to dealership . They said trans blown due to water in trans. Dipstick rusted inhalf. Leak with hose caused problem. Got fixed gm only paid 1/2 because we fought. Had extended warranty they said manufacturer defect. Found service bulletin on internet. Still fighting to get our money back . Only 51,000 miles.