20 Most Recent 2006 GMC Sierra - Page 7 Questions & Answers

Click the top left button on the steering wheel (looks like a book page) toggle the display (display is right under the temp and gas gauge on the left of dash). Go to Units and change between U.S. And metric to toggle from farentheight to Celsius an visa versa. It also changes between miles and kilometers, gallons / kilograms, etc.I hope that helps - it took me a minute to figure this out.

This code refers to the engine coolant temperature sensor circuit. The computer is not getting a proper reading from that circuit. Often the problem is a faulty sensor, but it could be a wiring problem in the circuit, a poor connection at the sensor, or a missing or stuck open thermostat.The ECT sensor is a two-wire sensor located in a coolant passage area, usually around the thermostat housing.

P0116 - Engine Coolant Temperature (ECT) Circuit Range/Performance Problem
The ECT (Engine coolant temperature) sensor is a thermistor which changes resistance based on temperature of the coolant in contact with it. The ECT sensor will be located in the block or coolant passage. Usually it is a two wire sensor. One wire is a 5 Volt supply from the PCM (Powertrain Control Module) to the ECT. The other is a ground to the ECT.

As the temperature of the coolant changes the resistance on the signal wire changes accordingly. The PCM monitors the reading and determines coolant temperature in order to perform essential engine fuel management. When engine coolant is low, sensor resistance is high. The PCM will see a high signal voltage (low temperature). When coolant is warm, the sensor's resistance is low and the PCM will see a high temperature. The PCM expects to see slow resistance changes on the ECT signal circuit. If it sees a quick change in voltage that isn't consistent with an engine warming up, this P0116 code will set. Or if it sees a lack of change in ECT signal, this code may set.

Symptoms: There may be no noticeable symptoms if the problem is very intermittent, however the following may occur:
MIL (Malfunction Indicator Lamp) illumination
Poor drivability
Black smoke at tailpipe
Poor fuel economy
May not idle
May exhibit stalling or misfires

Causes: Potential causes of the P0116 code include:
Missing or stuck-open thermostat
Bad ECT sensor
Short or open on signal wire
Short or open on ground wire
Poor connections in wiring

Possible Solutions: If there are any other ECT sensor codes, diagnose them first.
Using a scan tool, check the ECT reading. On a cold engine, it should match the IAT reading or should be equal to ambient (outside) temperature reading. If it does match the IAT or ambient temp, check the freeze frame data on your scan tool (if equipped). The saved data should tell you what the ECT reading was when the fault occurred.

a) If the saved info indicates that the engine coolant reading was at the coldest exreme (around -30 deg. F) then that's a good indication the ECT resistance was intermittently high (unless you live in Anchorage!) Check for an open in the ECT sensor ground and signal circuits and repair as necessary. If they appear okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

b) If the saved info indicates that the engine coolant reading was at the warmest exreme (around 250+ deg.F) then that's a good indication the ECT resistance was intermittently low. Check for a short to ground on the signal circuit and repair as necessary. If it appears okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

Other ECT sensor and circuit related DTCs: P0115, P0117, P0118, P0119, P0125, P0128
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P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

Symptoms: You will likely not notice any drivability problems other than the MIL illumination.

Causes: A code P0128 may mean that one or more of the following has happened:
Low engine coolant level
Leaking or stuck open thermostat
Faulty cooling fan (running too much)
Faulty coolant temperature (ECT) sensor
Faulty intake air temperature (IAT) sensor

Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
Verify coolant strength & level
Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
If the above items check out good, replace the thermostat
If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code



These codes are telling you that the engine temperature is not sufficient. This can be caused by a faulty coolant sensor,air in the cooling system,or a faulty computer.
The engine should run at 190 F & higher when warmed up. Scan the computer system to view engine temperature.

Keep us updated.

first check for blown fuses, then for obstructions, then check the operation of the switch, hold switch in retract position and gently tap and wiggle mirror

yes there is an airbag fuse located in fuse panel on left side of dashboard, drivers side door pillar post(drivers door needs to be open to see the fuse cover). if not there check under dash near left hand kick panel

Glow plugs are physically similar to spark plugs. You remove them with a plug spanner or deep socket. They shouldn't twist off, but as they're not removed for several years they will take a bit of turning. If you've got time, you could give the requisite plug a squirt of WD40 the day before replacing. Might ease it a bit. To avoid a problem for the next time its changed, you could put a dab of copper grease on the thread of the new one.

most likely acutator motor bad on drivers for temp control.

Hello: If you also change the filter it needs 6 quarts.

Thats the drain plug for the transmission fluid. Make sure it's tight. If it is you need a new plug and gasket.

under warrantee take it to the dealer and say FIX THIS

yes but the thing is that the rubber my have ***** out you could try to put some armorall on rubber!

there isn't a seperate fuse for the o2 sensors as such, they are controlled by the PCM. The fuses are listed on the inside of the box under the hood.

Hello,
This is a common issues with this truck. You have probably tightened the gas cap a bunch of times and are like what the heck. The gas cap DIC warning is part of the evaporative system to reclaim gas vapors. The onboard computer on the truck monitors the gas tank vapor pressure, which checks for vapor leaks in the fuel system. This warning involves a pressure mismatch, which the onboard computer relates to a fuel vapor leak. It assumes fuel vapors are escaping via your gas cap thus circumventing the purpose of the evaporative system. A common fix is to dip your finger in a bit of motor oil and put it onto the gas cap gasket to seal it (like you do an oil filter.) This should solve your problem. If the gasket is ripped or torn then buy a new gasket or a new gas cap. The reason for the oil is to lubricated the gasket again as they get very dry over time, given their location.
Regards, Tony