Question about 1995 Oldsmobile Aurora

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Service engine soon light comes on and the car shifts down to first or second gear and won't upshift again

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  • Oldsmobile Master
  • 17,970 Answers

If the engine light turn on, you have anu OBD fault code there; firts I suggest visit one autozone or autosho for scanning the vehicle and know exactly what code are there. With this "number" and other syntoms and details, we can send right information.

Keep in touch.

Posted on Jul 05, 2010

  • dsczanderson Jul 05, 2010

    I work at a ford dealership. a mechanic tried to scan it but his scan tool said no communication. can this car only be scanned with a tech 1 gm scan tool or should they all work

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Posted on Jan 02, 2017

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2001 Chevy S10 4x4 4L60E transmission works perfectly until 50MPH then I lose 3rd and 4th gear, 1st, 2nd and reverse are normal. Never happenend before, been parked since. Fluid is clean. Any ideas?


Are there any DTC's - diagnostic trouble codes ?in the PCM / BCM ? You have third an fourth below 50 mph but above 50 it down shifts to 2nd gear ,is this what your saying or you don't have 3rd or 4th gears at all ? Which engine did yours come with ? 2.2 L or 4.3 L You trans can set several DTC'S an not all will turn on the check engine light .
DTC B2722 (4.3 L) DTC P0218 (2.2 L) DTC P0218 (4.3 L) DTC P0502 (2.2 L) DTC P0502 (4.3 L) DTC P0503 (2.2 L) DTC P0503 (4.3 L) DTC P0705 (2.2 L) DTC P0706 (4.3 L) DTC P0711 (2.2 L) DTC P0711 (4.3 L) DTC P0712 (2.2 L) DTC P0712 (4.3 L) DTC P0713 (2.2 L) DTC P0713 (4.3 L) DTC P0719 (2.2 L) DTC P0719 (4.3 L) DTC P0724 (2.2 L) DTC P0724 (4.3 L) DTC P0740 (2.2 L) DTC P0740 (4.3 L) DTC P0741 (4.3 L) DTC P0742 (2.2 L) DTC P0742 (4.3 L) DTC P0748 (2.2 L) DTC P0748 (4.3 L) DTC P0751 (2.2 L) DTC P0751 (4.3 L) DTC P0752 (4.3 L) DTC P0753 (2.2 L) DTC P0753 (4.3 L) DTC P0756 (2.2 L) DTC P0756 (4.3 L) DTC P0757 (4.3 L) DTC P0758 (2.2 L) DTC P0758 (4.3 L) DTC P0785 (2.2 L) DTC P0785 (4.3 L) DTC P1810 (2.2 L) DTC P1810 (4.3 L) DTC P1860 (2.2 L) DTC P1860 (4.3 L) DTC P1870 (2.2 L) DTC P1870 (4.3 L) DTC P1875 (4.3 L) .
Shift Pattern This category contains the following topics:
?€¢
One forward gear only


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Two forward gears only


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Gear missing or slipping


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No upshift or slipping upshift


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No downshifts


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Non-First gear start


?€¢
Refer to First Gear Range Only - No Upshift .


?€¢
Refer to Third Gear Only .


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Refer to Second/Third Gear Only or First/Fourth Gears Only .


?€¢
Refer to Slips in First Gear .


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Refer to Slipping or Harsh 1-2 Shift .


?€¢
Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .


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Refer to No 3-4 Shift, Slips or Rough 3-4 Shift .


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Refer to No Part Throttle or Delayed Downshifts .


?€¢
Refer to Second Gear Start .

Feb 18, 2016 | Cars & Trucks

1 Answer

350z 2004 a/t with 120k miles 3 days ago my car overheated but reached just half of the temp gauge and i stopped the car and by the time it went back to normal i turned off the engine to cool down....


I don't think overheating of the engine has much to do with the transmission, either automatic or manual. If you have an automatic transmission, did you check the fluid? Sometimes low fluid stops certain gears from changing, as the torque converter doesn't have enough fluid to pressurize the servos to engage the clutches.

Feb 17, 2015 | Cars & Trucks

1 Answer

Electronic pressure control solenoid circuit p1745. Check engine light on 2000 ford escort, 4cl, automatic. Advance auto told me it was a dealer part but I can't find it on any of the ford websites?...


Here is what the service manual says about the EPC solenoid, the processor looks at allot of different inputs to command the solenoids, such as Throttle Position Sensor, Vehicle Speed Sensors, Transmission Range Sensor and RPM signal, The PCM controls the shift patterns for the transmission. Electronic Pressure Control (EPC) Solenoid
The electronic pressure control (EPC) solenoid is located on the main control valve body and is controlled by the PCM. The EPC controls line pressure used to apply and release clutches and bands in the transmission.
The 2-3 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 2-3 shift solenoid activates the 2-3 shift valve which controls the automatic shifting between second and third gear. Second gear is established when the 2-3 shift solenoid is switched on. The 2-3 shift solenoid is switched off when vehicle speed increases and requires a second to third gear upshift.
The 3-4 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 3-4 shift solenoid activates the 3-4 shift valve which controls the automatic shifting between third and fourth gear. Third gear is established when the 3-4 solenoid is switched off. The 3-4 shift solenoid is switched on when vehicle speed increases and requires a third to fourth gear upshift.

Mar 23, 2013 | Cars & Trucks

1 Answer

2003 Grand Am Automatic will shift normal from 1-2 but will not shift into 3 or 4.


Worn clutches or solenoid issues if it is an Alison style box.

Apr 02, 2017 | Pontiac Cars & Trucks

1 Answer

My rpm rev's past 3 car stalls then shifts...sometimes won't shift


Due for a transaxle rebuild,common on that veh

The fact you continued to drive it when it won't
shift correctly & has been slipping, your done

Aug 30, 2012 | 1998 Plymouth Grand Voyager

1 Answer

My dodge avenger shifts from first too second but wont shift back into first


transmission won,t shift from 1st gear,i changed the speed sensors and the shift module,and fluids ,filter,but still the same won,t shift,and ideas as to the problem?

May 19, 2012 | 1998 Dodge Avenger

1 Answer

Manual shift light blinks, chugs when accelerating.


Hi Seth, Check out your engine and gear box mountings! Regards John

Apr 01, 2012 | 1990 Ford Probe

1 Answer

Cold auto Transmission won't shift into 3 gear until after driving 1 mile or so (driving at about 35 mgh) pickup then downshifts from 3 to 2nd then back to 3rd a few times untill I get to work (7 miles...


Sounds like a bad speed sensor. Perform an ODBII scan soon. ECU should delay upshift until coolant temp senses warm up. It will not work right unless a signal is present from speed sensor.

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1 Answer

Transmission and Service Engine Soon light


it might be your vehicle speed sensor. It affects your speedometer, your cruise control and your trans shift points. Also, your throttle position sensor (TPS) affects shift points.

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Jun 22, 2009 | 1997 Ford Taurus

1 Answer

1995 CADILLAC ELDORADO car will not upshift... remains in second gear and service engine soon light on... Any ideas?


ok, its eather a bad ground for one of the transmision valve bodies, or just a stuck valve body, wich meens you will need trans work.

Apr 16, 2009 | 1998 Cadillac Eldorado

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