Question about 2001 Oldsmobile Aurora

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Lost overdrive last week, no noises, just won't

2001 olds Aurora 3.5L. Lost overdrive last week, no noises, just won't shift into overdrive. Diagnostic code p1825 showed up. Internal mode switch illegal malfunction. Where should we start???

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Codes 1826, 1825 and 1819. Car wont start. Do we need to remove trans to reset? Trans was used.


DTC P1819
Internal Mode Switch-No Start/Wrong Range

DTC P1825
Internal Mode Switch - Invalid Range

DTC P1826
Internal Mode Switch C Circuit High Voltage

The transmission internal mode switch (IMS) is a sliding contact switch attached to the selector detent inside the transmission side cover. The four inputs to the PCM indicate the position of the transmission range selector. The input voltage level at the PCM is high (B+) when the IMS is open and low when the switch is closed to ground. The four input parameters represented are Signals A, B, C and P (Parity). Refer to Transmission Internal Mode Switch Logic

Install a Scan Tool . A professional scan tool !
Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the Scan Tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.
Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Select IMS on the Scan Tool .
Place the gear select lever in PARK range, then move to NEUTRAL range.
Does each range selected match the Scan Tool IMS display?
.Replace the lever assembly-manual shaft detent with internal mode switch.
Refer to Transmission Overhaul in the 4T65-E Section of the Transmission Unit Repair Manual.

Mar 15, 2016 | 2001 Buick LeSabre Limited

1 Answer

Where is the internal mode switch?


P1825

Transmission 4-Wheel Drive Clutch
Relay Open Circuit



P1826

Transmission 4-Wheel Drive Low Clutch
Relay Circuit To Battery hope it helps

Apr 08, 2014 | 2003 Pontiac Grand Prix

1 Answer

2001 mazda 626 code p1744


P1744 - Torque Converter Clutch System Stuck in Off Position.

Either way the problem points to an internal transmission problem.
1. Drive it and see if the codes come back, and see if it is slipping in overdrive.

2. Check the transmission pressure in drive, with the overdrive on and the transmission slipping.

These transmissions have a high failure rate. Have seen internal transmission slippage that showed up in drive with the Overdrive (OD) switch on, but not with the OD switched off. It was related to the coasting clutch being on and off in that range. In that case, there was an internal mechanical transmission problem. We recommend a rebuilt transmission from the dealer and an external transmission cooler - the new rebuilt transmission will last longer.

Good luck (remember to rate this free answer).

Aug 11, 2011 | 2001 Mazda 626

2 Answers

Transmission makes whining noise in park and neutral. Wont shift into overdrive. And reverse wont work.


Time for a rebuild or a new tranny, this one won't last much longer, sounds like there are bearings and clutches failing or failed already.

May 04, 2011 | 1999 Chevrolet K1500

2 Answers

I have tha O/D OFF flasing in kia rio 2001


THAT IS THE OVERDRIVE IN THE TRANSMISSION
THE CAR MIGHT NOT WANT TO SHIFT TO HIGH GEAR OR OVERDRIVE SOME OF THESE CARS USE THE COMPUTER TO SHIFT IT TO OVERDRIVE AFTER IT GETS WARM THE THERMASTAT PLAYS A ROLL IN THAT WHEN THE ENGINE IS WARM THE LOOP IN THE COMPUTER CLOSES AND THE CAR WILL SHIFT TO HIGH/ OF THAT WON,T FIX IT THEN THE COMPUTER IS AT FAULT OR THE SENSOR IN THE TRANSMISSION IS BAD

Feb 26, 2010 | 2001 Kia Rio

1 Answer

Stalls out when idling and wont shift into overdrive


For the stalling issue, start by scanning the engine to see air flow, fuel trim, O2 sensor readings. Also look for any current or past DTC codes.

Oct 21, 2009 | 2001 Oldsmobile Aurora

2 Answers

I've got a '95 aurora that won't shift to 2nd or 3rd gear. I took shift assembly apart and checked shift solenoids and they tested fine. I dont have easy acces to a diagnostic computer. It was parked for a...


I had this problem and dealer said I needed a new tranny. Took it for second opinion at local trans shop and they replaced the shift switch in the tranny for $250.

Jan 01, 2009 | 1995 Oldsmobile Aurora

1 Answer

Ford winstar van


If your overdrive light is flashing and the transmission is not shifting properly, you most likely have diagnostic codes stored in the tranmission control module. These codes relate to a specific sensor/solenoid/actuator and can help in diagnosing your problem. You will need a scan tool to read these codes. You should also check your transmission fluid level to see if it is at recommended level (engine at normal operating temp). The fluid should be red in color, if it is very dark or brown/black in color and has a burnt smell to it, your transmission has internal damage and will need to overhauled.
A qualified transmission shop (Aamco, Lee Miles, Gibralter, etc.) would be your best bet.

Hope this helps.

Oct 16, 2008 | 2001 Ford Windstar

1 Answer

2002 Elantra P0121 code


The code says tps switch so replace the throttle position sensor.

Mar 12, 2017 | Hyundai Motor 2002 Elantra

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