Question about 1991 Oldsmobile Ninety Eight Regency

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A/c control console will not allow you to selects a/c mode

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If this happens either the console is junk, or the system is low on freon and won't allow you to select that mode.

Posted on Jul 04, 2010

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Posted on Jan 02, 2017

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2004 gmc envoy 4wd issues, can only go into 2wd and 4 low? what might be causing this or what should I replace?


Without hooking up a factory or professional scan tool an checking for DTC'S - diagnostic trouble code's . And or going through other diagnostic procedures for Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode an other diagnostic testing procedures ,you should not replace anything . You best bet ,take it to a qualified repair shop. Do you know what DTC'S are ? What an electronic control module is ?
The transfer case brake control is supplied voltage at all times, with the key ON, through the B+ circuit. The brake control is activated when the transfer case shift control module registers the following modes:
• AUTO FWD
• 4HI
• 4LO
This is accomplished when the transfer case shift control module provides ground to the brake control through the T-Case Lock circuit. If there is a fault in the brake control circuit, the transfer case shift control module goes into a shift block mode. The shift block mode causes the mode indicator to flash for 10 seconds when another mode is selected. After the 10 second period has ended, the indicator reverts back to the previous mode selection.

DTC B0770
DTC B0775
DTC B0780
DTC B0785
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550

Without proper diagnostic tool's an factory service repair information an knowledge how it work's , very doubtful you could fix these , or should you try .

Jan 06, 2018 | GMC Cars & Trucks

1 Answer

I have a 2009 GMC Acadia. What should the ERS mode be in on a normal basis?


Driver Shift Control (DSC) or Electronic Range Selection (ERS): This position (M-Manual / L-Low) allows the driver to utilize the DSC/ERS system. When the shift selector lever is moved to this position, the driver may select upshifts or downshifts by using the paddle switches located on the steering wheel/shifter. An upshift is requested by pushing either + button. Refer to the vehicle owner's manual for more specific DSC/ERS information.
Driver Shift Control (DSC)/Electronic Range Selection (ERS)
Refer to the owner's manual for specific instructions on DSC. The TCM will override shift commands when maximum engine speed is achieved and will protect from any downshift which may cause excessive engine RPMs.

Electronic Range Select (ERS) Mode
ERS mode allows you to choose the top-gear limit of the transmission and the vehicle's speed while driving down hill or towing a trailer. The vehicle has an electronic shift position indicator within the instrument panel cluster. When using the ERS Mode a number will display next to the L, indicating the current gear that has been selected.
To use this feature:
Move the shift lever to L (Low).
Press the plus/minus button located on the shift lever, to increase or decrease the gear range available.
When you shift from D (Drive) to L (Low), the transmission will shift to a pre-determined lower gear range. The highest gear available for this pre-determined range is displayed next to the L in the DIC. See Driver Information Center (DIC) and DIC Operation and Displays for more information. The number displayed in the DIC is the highest gear that the transmission will be allowed to operate in. This means that all gears below that number are available. For example, when 4 (Fourth) is shown next to the L, 1 (First) through 4 (Fourth) gears are automatically shifted by the vehicle. the transmission will not shift into 5 (Fifth) until the + (Plus) button is used or you shift back into D (Drive).
While in L (Low), the transmission will prevent shifting to a lower gear range if the engine speed is too high. You have a brief period of time to slow the vehicle. If vehicle speed is not reduced within the time allowed, the lower gear range shift will not be completed. You must further slow the vehicle, then press the - (Minus) button to the desired lower gear range.
Automatic Engine Grade braking is not available when the ERS is active. It is available in D (Drive) for both normal and Tow/Haul mode. While using the ERS, cruise control and the tow/haul mode can be used. See Tow/Haul Mode for more information.
© 2017 General Motors Corporation. All rights reserved

Oct 09, 2017 | 2009 GMC Acadia

1 Answer

2004 Peugeot 407 2.0L HDi. Does this model come equipped with a trip computer? There is a button on the control console but when pressed doesn't work.


the button is a mode selection button and has to be held in for a few seconds to get the mode selection to work

Jul 17, 2016 | Peugeot Cars & Trucks

2 Answers

Changed the dashboard switch for 4wd. That didn't work. Still cannot get into 4wd.


The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module (TCCM) starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the TCCM has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been engaged. Once the new mode/gear position is fully active, the switch indicator for the new position remains ON constantly. In the event that the TCCM can not or will not complete the shift, the indicator returns to the previously selected position; this is a Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode condition.
The New Venture Gear model NVG 246 RPO NP8 transfer case is a two speed automatic, active, transfer case. The NVG 246 EAU provides 5 modes, Auto 4WD, 4HI, 4LO, 2HI and Neutral. The Auto 4WD position allows the capability of an active transfer case, which provides the benefits of on-demand torque biasing wet clutch and easy vehicle tuning through software calibrations. The software calibrations allow more features such as flexible adapt ready position and clutch preload torque levels. The technology allows for vehicle speed dependent clutch torque levels to enhance the performance of the system. For example, the system is calibrated to provide 0-5 ft lb of clutch torque during low speed, low engine torque operation, and predetermined higher torque for 40 km/h (25 mph) and greater. This prevents crow-hop and binding at low speeds and provides higher torque biases at higher vehicle speeds, in order to enhance stability.

Mar 26, 2016 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

Compressor started with out being turned on and no fan running


If the defrost setting is selected on the controller, the compressor will run. It doesn't need to be turned on through AC selection. Defrost mode allows the compressor to cycle to keep the oil and freon circulating when AC not in use

Sep 06, 2015 | Cars & Trucks

2 Answers

Ford sync wont recognize ipod


Your car may need a software firmware update, contact the local Ford dealer for details.

Feb 20, 2012 | 2008 Ford Focus

1 Answer

2002mustangautomatic 3.8engine, when I am driving the tach shows 2100rpms at 70mphshouldbeabout1800rpms why is the tach so high


Hi Jd,
I think you'd be wise to check that the gear shift is allowing the vehicle to change into the top gear....Have a look at the electronic control selection switch, which should be located close to the selector lever and check to see if you've selected economy. If the vehicle is in 'sport mode' the gearbox will hold in a lower gear to give additional performance.
Regards Johngee10

Feb 07, 2011 | 2002 Ford Mustang

1 Answer

What does ECT PWR green light on dash mean? It just popped up at 160k


Hello. Welcome to FixYa. Please allow us to assist you.

The ECT PWR light is on because someone has inadvertantly bumped the switch. Look on the console, by the shifter, or on the dash for a switch labeled ECT. Turn it off, and the light will go out.

The ECT PWR mode, when activated, increases the time that the transmission shifts up thru the gears. Without the mode selected, the first shift would be at 18-20 mph. With the mode selected, the first shift would be 20-22 mph. This mode basically allows the shift to occur later, and is normally used when you are towing something, or if you have a large load of cargo in the car.

Thanks for choosing FixYa for assistance. Have a great day.

Nov 10, 2010 | 2000 Toyota Tacoma PreRunner

1 Answer

2007 F-150 Supercrew Lariat Cabin Air Filter


According to the shop manual you do not have one.
Air Distribution and Filtering adobe.gif Printable View (79 KB) NOTE: The air distribution system of this vehicle cannot be equipped with a cabin air filter.
There are 2 sources of air available to the air distribution system:
  • Outside air
  • Recirculated air
Recirculated air is automatically used when the electronic manual temperature control mode selector is set in the MAX A/C or OFF modes and can be selected in any mode other than MAX A/C, OFF or DEFROST by selecting the RECIRC button. Recirculated air is available in all modes except DEFROST. If the vehicle is equipped with an electronic automatic temperature control (EATC) system, recirculated air is used in OFF and is available in all modes except DEFROST. RECIRC mode is a timed function in FLOOR and FLOOR/DEFROST.
Air distribution within the vehicle is determined by the electronic manual temperature control (EMTC) function selector switch position, or is controlled by the EATC system in the AUTOMATIC mode. The air distribution mode on EATC vehicles may be overridden by the driver if desired. Air distribution doors are used to direct airflow within the heater core and evaporator core housing and the plenum chamber. An electronic mode door actuator is used to position these air distribution doors. One air inlet mode door is used to switch between FRESH or RECIRC air inlet. An electric actuator is used to position the air inlet mode door.
Air enters the passenger compartment from the:
  • instrument panel A/C registers.
  • heater outlet floor ducts.
  • windshield defroster duct.
  • side window demisters.
  • center flow-through console (if equipped).
Passenger compartment air is exhausted from the vehicle through open windows or body air vents.

Mar 08, 2009 | 2007 Ford F-150 Harley Davidson

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