Question about 1994 Ford Thunderbird

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Transmission wont shift at normal operating range, only at high rpm, from low to second gear, is there a relay, or sloenoid that may be bad?

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  • Master
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Is the check engine light on? Sounds like a bad TPS.

Posted on Jul 04, 2010

  • Clint Smock
    Clint Smock Jul 06, 2010

    I guess you didn't like my answer. There isn't a relay or a solenoid that can cause the shift points to be high. Solenoids would cause it not to shift or the pressure solenoid could cause it to shift hard. If the relay was bad it would stay in 3rd. High shift points could be TPS or MAF.

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Where is the four wheel module located on a 2001 f350 7.3 l lariat 4x4 nothing on the four wheel drive works and I checked all the fuses and are all fine


Have it check for DTC'S - diagnostic trouble codes ?
GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action C1728 Transfer Case Unable to Transition Between 2H and 4H GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. C1729 Transfer Case Unable to Transition Between 4H and 4L GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P0500 Vehicle Speed Sensor (VSS) Malfunction GEM GO to Pinpoint Test F . P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM GO to Pinpoint Test H . P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure GEM GO to Pinpoint Test I . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM GO to Pinpoint Test E . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM GO to Pinpoint Test E . P1819 Transmission Park/Neutral Position Switch Short Circuit to Ground GEM GO to Pinpoint Test F . P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short to Battery GEM GO to Pinpoint Test E . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1830 Transmission Transfer Case Counterclockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test E . P1832 Transmission Transfer Case Differential Lockup Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1834 Transmission Transfer Case Differential Lockup Solenoid Short Circuit to Battery GEM GO to Pinpoint Test G . P1865 Transmission Transfer Case Contact Plate Power Short to Ground GEM GO to Pinpoint Test E . P1866 Transmission Transfer Case System Concern - Servicing Required GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM GO to Pinpoint Test E . P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test G . - For All Other DTCs GEM GO to Section 419-10 .
Your best bet , take it to a qualified repair shop that has the diagnostic tool to trouble shoot .
Principles of Operation
Transfer Case - Electronic Shift
The four-wheel drive, electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4X4 HIGH, and 4X4 LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators, one for 4X4 HIGH which is 4X4, and one for 4X4 LOW which is LOW RANGE (in 4X4 LOW both the lamps are on). Shifts into 4X4 HIGH can be made at any speed. When shifting into 4X4 HIGH with the vehicle stationary, tooth blockage may occur, preventing shift completion. When the vehicle is driven above 8 km/h (5mph) the shift will complete. When shifting in or out of 4X4 LOW, the generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission). (The digital transmission range [TR] sensor informs the GEM when the automatic transmission is in the NEUTRAL range position.)
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and the range fork within the transfer case between the 4X4 HIGH, 4X4 LOW, and 2WD range positions.
The GEM uses two relays to control the gearmotor encoder assembly shift between 4X4 HIGH, 4X4 LOW, and 2WD modes. The GEM controls the pulse vacuum hublock (PVH) solenoid which supplies engagement and disengagement vacuum to control the hublocks.
The GEM accomplishes shifts by interpreting inputs from:
  • mode select switch (MSS)
  • vehicle speed signal (transmitted from the ABS system)
  • gearmotor encoder plate position
  • brake pedal switch
  • digital transmission range (TR) sensor (automatic transmission)
  • clutch pedal position (CPP) switch (manual transmission)
  • ignition switch
Based on these inputs, the GEM controls the shifts into 2WD, 4X4 HIGH, or 4X4 LOW with the following outputs:
  • low to high relay (clockwise)
  • high to low relay (counterclockwise)
  • pulse vacuum hublock (PVH) solenoid
  • gearmotor encoder assembly
The electronic shift-on-the-fly (ESOF) system has a feature which allows the driver to override the vacuum operated hublocks. When the front hublocks are manually turned to the LOCK position, the hublocks are locked at all times, overriding the vacuum operated system. If the front hublocks are manually turned to the AUTO position, the hublocks can only be locked by turning the MSS to 4X4 HIGH or 4X4 LOW position.

Jun 12, 2017 | Cars & Trucks

1 Answer

Won't drive or shift in 3rd gear but will reverse first and second gear


If it won't shift to 3rd and stays in second, bad shift solenoid/s. If it shifts and the transmission drops out(high RPM's), the bad clutches in the transmission. Rebuild. Solenoids around $600 to replace. Transmission rebuild around $2200.

May 06, 2016 | 2002 Buick LeSabre

1 Answer

Why won't 1989 Volvo 240 shift into high gear anymore?


Either the O/D solenoid or relay has gone bad. However if the light operates you may have to much wear in the main housing in the rear of the transmission causing the pressure to be low in the case a transmission replacement is in order.

Sep 17, 2014 | Volvo 240 Cars & Trucks

1 Answer

I have 1998 passat when i do 100km the rpm goes above 3000 it feels like needs a gear pls let me know what might be the problem


I am assuming that this is an automatic transmission and it would indicate that that the transmission is not shifting into high gear. The normal rpm range at 100km should be 1800 -2200 rpm's. A visit to the transmission shop would be my recommendation.

Feb 19, 2011 | 1998 Volkswagen Passat

1 Answer

Rpm's going 4500 before shifting to second gear second and third are ok whether in overdrive or not .year ago was in accident trans run two quarts low for one hour.trans feels good just delay on shift from...


Torque converter is probraly going bad, the automatic gear selector having trouble seeking or going into another gear unless high rpm to select it out to another gear. Could also be your 1gear is getting bad. you may need to take it to the shop as in the long term, it can damage more. You could check to see if fluid is up to level too, as this does happen when it's low in transmission fluid.

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1 Answer

1996 ford explorer 4wheel drive will not engage into the hubs need to know how it works


make sure your 4WD switch is working.and fuse is okay.because your 4WD is control by 4 electric shift motors in which drive a rotary cam which moves the mode fork and range fork inside the transfer case to select between 2WD HIGH A4WD - 4WD HIGH AND 4WD LOW RANGE.a shift motor sensing plate on the shift motor monitors the range in which the transfer case is operating a transmission range sensor monitors the gear position of the transmission.which must be in neutral to shift into low.a pair of solenoids one for 2WD one for 4WD.mounted on the upper right firewall route vacuum to the vacuum motor which engages and disengages the center axle disconnect collar in the front axle assembly.a 4 x 4 shift motor relay module contains two GEM controlled relays which shift the transfer case shift motor between 2WD and 4WD modes.a solid state clutch relay activates the A4WDclutch inside the transfer case.

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2 Answers

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sounds like the clutches are slipping or you have a bad seal in tranny, which wont allow it to keep pressure. have you changed the fluid and filter?

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1 Answer

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I am having trouble understanding what you are saying but it sounds like you are saying the transmission shift points are too high. (Holds the gears too long, RPM's too high before it shifts) RIght? Check to see if you have vacuum to the modulator at Idle. If yes replace the modualtor.

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3 Answers

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