2005 GMC Sierra 2500HD 4WD - Answered Questions & Fixed issues


the maximum pay load is 3534 lbs (3.5 tons ) and the maximum towing capacity is 18000 lbs or 9 tons
from your description of 2 thermostats I take it is a v8 hopefully a 6.6 ltr v8 turbo diesel
it should have come with a 6 speed allison auto transmission.
with a 35ft, 5th wheeler behind it the combined gross max mass would be getting close to max allowed
add any speed on the highway and the transmission will be running at high oil temperatures and that heat is transferred to the radiator by the transmission oil cooler in a tank of the radiator
the high oil temps could be slippage in bands and clutch packs in the transmission( not noticeable under normal driving conditions) so an check and adjustment would not go astray
next if the adjustments are set properly, it may become necessary for you to consider an air to air transmission cooler so that the heat from the transmission is transferred to passing air flow and not accumulated and added to engine coolant temperature
those kits are available from most accredited transmission specialist shops and will reduce the transmission oil temp by at least 40%
taking that the coolant temp is 95 -98 c the transmission oil will be running a lot lower, saves the oil and the transmission and will help prevent boiling of the coolant
it may be necessary for you to lock up the fan clutch as well

2005 GMC Sierra... | Answered on Apr 06, 2017 | 428 views


It's part of the RAP (Retained Accessory Power) circuit. Yours may be actuated by a pin switch on the hinge side of the door jamb or inside the door as actuated by the door handle linkage.

Thread radio stays on when door is opened

2005 GMC Sierra... | Answered on Nov 09, 2015 | 143 views


Get a new swich

2005 GMC Sierra... | Answered on Aug 03, 2015 | 68 views


May be blockage in the system caused by either Dirt or heavy build up of carbon in system but more likely the filter is doing its job and his becoming blocked.
Change the oil when it is HOT and the filter and you should be OK

2005 GMC Sierra... | Answered on Aug 03, 2015 | 135 views


check for power/ground at the blower motor if you have this replace the motor. if not you will have to check the wiring back from the motor to the switch.

2005 GMC Sierra... | Answered on Jun 24, 2015 | 37 views


That transmission is a 4L80E a pretty hefty transmission.The reverse band is probably slipping or broken,or you may have some broken hard parts either way the transmission needs to come apart comepletly.

2005 GMC Sierra... | Answered on Mar 08, 2015 | 90 views


sounds like you have checked a lot of things if it was mine I would do new intake gaskets, I had a 2002 Sonoma I did a lot of what you did and every time I gave it back to owner a few days later lite was on and p0300 I did intake gaskets and its been good 2 yrs now,not sure what gaskets you got but gm use plastic ones I got new gm ones and they were aluminum type call gm dealer parts good luck

2005 GMC Sierra... | Answered on Mar 05, 2015 | 260 views


Could be a bad ignition control module or a compression issue as well. A methodical diagnosis needs to be performed so you don't keep chasing your tail and spending tons of time and money on this issue. Looking up a factory manual that covers your specific vehicle and testing operation of all suspect systems would be my next move. Misfire under load isyour symptom, the cause can be mechanical or electrical.

2005 GMC Sierra... | Answered on Mar 05, 2015 | 101 views


Owner's manual, troubleshooting? probably an electrical control problem in the differential.

2005 GMC Sierra... | Answered on Mar 04, 2015 | 192 views


Use tensioner release tool to loosen belt and pull it off tensioner, paying careful attention to how the belt is routed through all the pulleys.

2005 GMC Sierra... | Answered on Jan 21, 2015 | 183 views


just had this problem it was the PDM ended up replacing the glow plugs
best price and life time warranty for both was at Auto Zone recommend if you buy the PDM get the extension cable and move the PDM to a cooler location

2005 GMC Sierra... | Answered on Dec 16, 2014 | 6,624 views


Most likely problem is the brake light switch is broken or out of adjustment. The switch is located under the dash on the arm lever of the brake pedal. When the pedal is at rest, the arm presses the switch in and turns off the lights. If the switch gets loose, broken, or out of adjustment, it may not close and allow the lights to stay on constantly.

2005 GMC Sierra... | Answered on Aug 04, 2014 | 198 views


the key lock may be badly damaged so I would get it replaced by a auto lock smith.

2005 GMC Sierra... | Answered on Jul 04, 2014 | 23 views


I'm guessing manual

2005 GMC Sierra... | Answered on May 16, 2014 | 33 views


DTC P0894 Transmission Component Slipping
DTC P0894Circuit Description with 4L80-E / 4L85-E Automatic Transmission The powertrain control module monitors the engine speed and the transmission output shaft speed. The PCM calculates turbine shaft speed and torque converter clutch (TCC) slip speed by using inputs from the automatic transmission input shaft speed sensor, automatic transmission output shaft speed sensor, and other transmission components. The forward clutch housing is used as the AT ISS rotor. Whenever the TCC is engaged, engine speed and turbine speed will closely match, indicating low TCC slip speed. In D3, with the TCC engaged, calculated transmission component slip can only occur in the torque converter. In D4 OVERDRIVE, with the TCC engaged, transmission component slip can occur in the TCC or the fourth clutch assembly. If the PCM detects an excessive TCC slip speed in D4 OVERDRIVE, when the TCC should be engaged, then DTC P0894 sets. DTC P0894 is a type C DTC. For California emissions vehicles, DTC P0894 is a type B DTC.DTC Descriptor This diagnostic procedure supports the following DTC: DTC No MAF sensor DTC P0101, P0102 or P0103. No MAP sensor DTC P0106, P0107 or P0108. No TP sensor DTC P0120 or P0220. No VSS DTC P0502 or P0503. No ISS DTC P0716 or P0717. No TCC Stuck Off DTC P0741. No TCC Stuck On DTC P0742. No 1-2 SS valve DTC P0751, P0752 or P0753. No 2-3 SS valve DTC P0756, P0757 or P0758. No TFP manual valve position switch DTC P1810. No TCC PWM solenoid valve DTC P2761. The throttle angle is 10-100 percent. Engine speed is 1,250-5,000 RPM. The TFT is Vehicle speed is TFP manual valve position switch indicates D4. The TCC is commanded ON for 0.04 second or greater. TCC is locked ON for greater than 0.1 second. Commanded The PCM detects slip in the torque converter clutch and/or the fourth gear clutch pack with the TCC in an apply or locked mode. DTC P0894 sets during the second consecutive trip when one of the following conditions occur: The TCC slip speed is 100-550 for 10 seconds for three occurrences.The TCC slip speed is 100-550 for 10 seconds, the PCM commands maximum line pressure. The TCC slip speed is 100-550 for 12.5 seconds, the PCM commands the TCC Off for 2 seconds. The TCC slip speed is 100-550 for 15 sec For California emission equipped vehicles, the PCM illuminates the malfunction indicator lamp during the second consecutive trip in which the Conditions for Setting the DTC are met. For Federal emission equipped vehicles, the MIL is not illuminated. The PCM commands maximum line pressure. The PCM inhibits the TCC engagement. The PCM freezes transmission adaptive functions. The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame, California only, and Failure Records, California and Federal. The PCM stores the DTC P0894 in PCM history during the second consecutive trip, California, or the first trip, Federal, in which the Conditions for Setting the DTC are met. For California emissions, the PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes. A scan tool can clear the MIL/DTC. For California emissions, the PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring. For Federal emissions, the PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM. A TFP manual valve position switch malfunction can set DTC P0894. A mechanical failure of the shift solenoids or TCC PWM solenoid valve can set DTC P0894. Internal transmission failures can result in a DTC P0894. Sticking or contaminated shift valves may cause intermittent slipping in D4. DTC P0894 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine. The numbers below refer to the step numbers on the diagnostic table. 3. This step tests the indicated range signal to the actual selected range. A faulty TFP manual valve position switch can set a DTC P0894. 4. This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in fourth gear; and confirms that the fault is present. 5. This step tests for excessive TCC slip speed while in a commanded TCC lock-up state and in third gear. 6. This step tests for a sticking TCC shift valve. 7. This step tests for proper transmission line pressure.

2005 GMC Sierra... | Answered on Apr 22, 2014 | 631 views


Yes the 2005 GMC Sierra 2500HD (with or without 4wd) came with a 4L80E transmission. If the truck moved and drove fine before you stored it. Your repair may be minor but you will need to inspect some components. You need to check as much wiring as you can. Look for a nest. When vehicles sit for a while animals (mice) can move in and wreak it. The problem is in the valve body. The shift solenoid (1-2) is either jammed, defective, has defective wiring going to it, or the PCM is not working correctly. Is the engine light on during this failure? If so, has anyone retreived the codes? Please write back if you have more questions but be detailed, as best as you can, good luck.

2005 GMC Sierra... | Answered on Mar 15, 2014 | 136 views


there are a few possibilities. are you getting the right fuel pressure ? Do you have spark ? Is the check engine light on. scan for any codes. It could be the crank sensor. On these newer models this sensor allows for fuel and spark

2005 GMC Sierra... | Answered on Jan 31, 2014 | 25 views


more than likely it is going to be a short in the headlight switch. not uncommom.

2005 GMC Sierra... | Answered on Jan 31, 2014 | 99 views

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