Question about 2000 Cadillac Seville
I have a 2000 cadillac seville with a 4t80e automatic transmission. My car stopped shifting into 5th gear at high speeds. It stays in 4th when maintaining my speed, or accelerating, and only shifts into 5th gear if i take my foot completely off the gas, or If i'm going downhill. I believe its the shift solenoids A&B, but I can't find any information saying if these are in charge of 5th gear, or if 5th gear is controlled by another solenoid that could be malfunctioning
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Posted on Jan 02, 2017
This could be caused by a defective shift solenoid that would require transmission pan removal and valve body disassembly to replace the solenoid. Is there an engine light that is lit? Is there e trouble code displayed on the instrument cluster?
Posted on Oct 04, 2010
SOURCE: I have a 95 cadillac
Hello: PO 76 deals with the pressure control solenoid, this is per 1995 Cadillac service manual. In the section for the Northstar engine and the 4T80 transmission.
Posted on Feb 12, 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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