Engine Cooling System Problems of GMC Sierra 2500

The contact owns a 2001 GMC Sierra 2500. The contact stated while driving 50 mph the vehicle stalled without any warnings. The contact mentioned that he was able to turn the vehicle back on but the failure persisted. The vehicle was taken to a local mechanic who diagnosed that the fuel pump was defective and needed to be replaced. The mechanic also advised that the fuel lines needed to be cleaned. The remedy failed to repair the problem. The manufacturer was made aware of the failure but did not offer any assistance since the vehicle was not included in NHTSA recall campaign id number: 07v521000 (engine and engine cooling). The vehicle was not repaired. The failure mileage was 79,500 and the current mileage was 80,000.

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I have a 2006 GMC Sierra 2500 with the lbz duramax and allison transmission. Two of the transmission coolant lines began leaking transmission fluid at the crimp ends in Dec of 2010. The truck only had 30,000 miles, but was the 36 month warranty period. Service under warranty was denied. An on-line search reveals several others have complained about this issue and that the dealer installed oem replacement lines are no better (developing leaks soon after replacement), yet no TSB or corrective action has been issued by gm. Leaking transmission fluid is a fire and environmental hazard. The leaks are getting worse.

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2005 GMC 2500hd pickup truck, hvac blower speed controller/relay connector got hot, burned out connector and wire, lots of smoke. It happened when turn fan to high. The failure was due to contact resistance at the connector. The wire harness end is tinted copper, the relay/controller connector is bare metal. Due to galvanization of different metal in the connection system, the connector is undersize for the black wire, which is the return current because the blower assembly is plastic. The resistance between the contact point of the connector act as heater and got hot, burn out connection and connector housing. The speed control unit, which composed of few power resistor is mounted in the air stream that it will collect vapor water due to condensation when ac is in used. This cause corrosion in the speed controller/relay board. The work around is bypass the connector by shorting the black wire from the blower motor to the black input wire that burned out. Cut the input black wire, wire nut it together with a 12 awg jumper wire, cut the black wire at the blower motor, wire nut it to the other end of the jumper wire. After the jumper put in, blower fan works in all speed and no smoke from connector and wire.

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The contact owns a 2001 GMC Sierra 2500 hd. The contact stated that for the past year the vehicle had stalled intermittently. There were no prior warnings prior to the stalling, but the message center and battery light would illuminate after the failure occurred. The dealer performed a diagnostic test, but was unable to detect any failure codes. The contact tried replacing the fuel pump and relays, but that did not correct the failure. The contact then became aware of a recall for the crankshaft position sensor under recall campaign number 07v521000, engine and engine cooling. The manufacturer confirmed that although the vehicle was experiencing the same failure, it was not included in the recall. The failure mileage was 52000 and the current mileage was 58300. Updated 02/07/11 updated 04/20/11.

Hose clamp on hose at coolant reservoir lower connection failed. Vehicle had 1,935 miles on it. Hose clamp was either defective or over stressed at installation when truck was manufactured. This failure resulted in a rapid loss of engine coolant. Vehicle was stopped prior to overheating due to driver noticing that vehicle was having difficulty maintaining normal engine temperature based on temperature gauge indication. Warranty repair replaced clamp with screw type hose clamp. All other engine coolant hoses use similar factory installed spring type clamps. Currently no other problems exist.

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The contact owns a 2001 GMC Sierra 2500. While driving approximately 30 mph, the vehicle shut off on three separate occasions without warning and had to be restarted. The VIN was not included in NHTSA campaign id number 07v521000 (engine and engine cooling). The current mileage was 60,520 and failure mileage was 60,515. Updated 06/09/08 the consumer stated the problem was diagnosed and the crankshaft sensor was replaced. Updated 06/09/08.

The contact owns a 2001 GMC Sierra 2500 hd. The contact stated that the crankshaft position sensor failed and was replaced. Six years later, the contact located a recall for the failure under NHTSA campaign id number: 07v521000 (engine and engine cooling). The dealer was contacted but informed him that his VIN was not included in the recall and he could not be reimbursed for the repairs. The contact confirmed that the vehicle was not included in the recall. The failure mileage was 60,358 and the current mileage was 82,000.

When climbing a significant grade , 6%, while towing 12. 500# 5th wheel on a day with high ambient temperature , 95% engine temperature, immediately began to climb and reached almost overheat when I fortunately found a place to pull off the road. Incident took place on the grapevine in CA. If I hadn't been able to pull over I would have been stuck in traffic lane with 18 wheelers right behind me. 2 dealers were unable to help.

Speedometer stopped working at approx 45,000 mi. Followed by oil pressure and voltmeter at approx 60,000 mi. Also coolant leak behind timing cover at approx 50,000 mi.

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The contact owns a 2001 GMC Sierra 2500 hd. While driving approximately 40 mph, the vehicle stalled without warning and then immediately restarted. The contact is a professional mechanic and he repaired the fuel pump, fuel filter, and fuel pressure regulators; however, the failure continued. He notified the dealer and they stated that the VIN was not included in NHTSA campaign id number 07v521000 (engine and engine cooling), even though the failure was identical. He was informed that he would have to repair the vehicle at his own expense. The failure mileage was 62,000 and current mileage was 72,000.