Question about 2000 GMC Safari
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Posted on Jan 02, 2017
possible but it can also be a range selecter switch problem. any work done on vehicle lately? pleas respone and i will try my best to help thanks.
Posted on Jan 31, 2009
Sounds like you have a bad shift solenoid. Not sure if the Chevys are a solenoid pack, or seperate, but it will need to be replaced.
Posted on Jun 02, 2009
These vans have had issues with the PIN connections to the instrument clusters. With time the solder on the main PIN connection will begin to fail. The good news this may be repaired at home. First you'll need to remove the instruments. To do so remove the dash components from around the instruments then the (4) screws) that hold the instruments in place. Carefully detach the wire connection from the back of it; take to a well lit area. Look for a PIN with a failed solder joint (this will appear as a slight black or grey circle. If found apply heat and let solder begin to flow; the allow to cool and reassemble. If you look at my history you'll see I've helped others with this issue. The attached link may help: http://dodgeforum.com/forum/dodge-caravan/197192-99-grand-caravan-intermittent-dead-dashboard.html
As for the transmission I expect this a seperate issue, possibly the BCM but I'd like to review further.
Please let me know if this assisted you,
Posted on Nov 06, 2009
check or replace your thottle position sensor tps that trans needs to know where the throttle is to shift if it is bad it will do as you say wont shift to third
another telltale is it will act like it goes into lockup when shifting into reverse and stall the engine
Posted on Feb 19, 2011
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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 !
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