Question about 1997 Mercury Sable

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Why does my gear shift lock? - 1997 Mercury Sable

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Brake shift interlock. Have to step on brake to get shifter out of park. For safety to prevent unintended acceleration.

See owner manual for emergency bypass, if fuse goes or brake pedal switch is inop.

Posted on Apr 01, 2011

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Posted on Jan 02, 2017

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2 Answers

05 Trailblazer transmission says neutral but gear shiftier is locked in park.


Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
• The automatic transmission shift lock control solenoid
• The automatic transmission shift lock control switch
With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to be move out of the PARK position.

Circuit Description
The transmission range (TR) switch is part of the park/neutral position (PNP) and back-up lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.

These are all electronically controlled , yur best bet would be to take your vehicle to the dealer .

Apr 19, 2017 | 2005 Chevrolet TrailBlazer

2 Answers

This morning it started fine but will not come out of gear and my airbag light is on. Someone said it was the fuse but I am not sure which fuse. Any ideas ?


I am mechanic I really need to no more make ect. but it could be battery or the ignition switch or ignition lock n key but like I said need more information this is a guess that I told you

Oct 21, 2015 | 2008 Chevrolet Chevrolet TrailBlazer LT

1 Answer

Shifter is locked in park on a 2002 bravada that sayes on dash its in reverse


PRND321 Display
The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM). The IPC - instrument panel cluster receives a serial data message from the ECM indicating the gear position. The PRND321 display blanks if:
?€¢
The ECM detects a malfunction in the transmission range switch circuit.


?€¢
The IPC detects a loss of serial data communications with the ECM. The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
?€¢
The automatic transmission shift lock control solenoid


?€¢
The automatic transmission shift lock control switch

With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to be move out of the PARK position.
The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The PCM supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.
You need a Tech2 scan tool to diagnose this problem ! possible range sensor !

Sep 03, 2015 | Cars & Trucks

1 Answer

Gear shift stuck in park on 2006 caddillic dts


Shift lock control on this vehicle is complicated - your problem is probably a malfunctioning part in the system such as the shift lock control switch at the brake pedal, the Park relay, the shift lock relay (if equipped) or the A/T shift lock control solenoid. Take it to a dealer ...

Jan 27, 2015 | 2006 Cadillac DTS

1 Answer

Shift lock


It could possibly be a bad electrical connection or poor connection with the transmission. Did the mechanic get any error codes?

Nov 08, 2013 | 1996 Geo Prizm

1 Answer

Trail blazer gear shift button


Could be the brake switch or the shift lock solenoid. You may be able to turn the key lock to the unlock position, move the shifter out of park, then start the engine in neutral.
The shifter and the shift lock solenoid would need to be inspected.

Jun 19, 2013 | Cars & Trucks

1 Answer

Disengaging shift lock


If you mean the gear shirt is stuck and you want to use the shift lock, then beside your gear shift there will be a spot that says disengage shift lock, pry open the cover and usually you can disengage it with a screwdriver sometimes when you pop the cover there is a switch that you can push to disengage shift lock hope this helps you

Jan 05, 2011 | 2002 Hyundai Accent

1 Answer

1995 crown vic gear problems/gear shift wont lock


most likely the shift tube bushings are bad- you may have also lost a few screws in the shift tube or they could just be loose. you have to pull the steernig column down to inspect/repair it.

May 30, 2009 | 1995 Ford Crown Victoria

2 Answers

Will not shift


neutral safety switch in console jammed, not releasing handle to change gears.

Apr 29, 2009 | 2005 Infiniti G35

2 Answers

Sheift lock


The term "shift lock" is the system that is in place to prevent the vehicle from being shifted out of Park into Reverse or Drive WITHOUT having the driver's foot firmly on the brake pedal. The brake light switch on the brake pedal closes a circuit that energizes a solenoid under the shifter. When the brake is applied, and the solenoid is energized, the shift lever is no longer "locked", and can be moved to the desired position.
The idea here stems from a phenonomon several years ago that dealt with the issue of "Sudden Intended Acceleration". What was happening here was, for some unknown reason, engines started developing high RPMS for no reason, and several accisents were reported due to this issue. The vehicle would accelerate "unintendedly", when putting into drive or reverse, and could hit something.

Oct 02, 2008 | 2005 Toyota Corolla

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