165 ($A5) 3-4 Shift Solenoid, No RPM Drop at 3-4 Shift
NAME OF CODE165 ($A5) - 3-4 Shift Solenoid, No RPM Drop at 3-4 Shift
WHEN MONITORED
Continuously with the key on and engine running.
SET CONDITION
This code is set if the expected engine RPM drop does not occur within 4 seconds of the gear change being requested by the PCM. Three consecutive bad tests are required to set the code.
THEORY OF OPERATION
This solenoid is used to control the gear change from 3rd to 4th (OD). The Powertrain Control Module (PCM) energizes the solenoid by grounding the 3-4 Shift Solenoid Control Circuit. The Solenoid receives it's 12-volt supply from the transmission relay. The PCM will not allow 4th gear (OD) if the transmission oil temp is below 32° F. The PCM will also disable 4th gear if the transmission oil temperature goes above 260° F.
TRANSMISSION EFFECTS
The transmission will not have 4th gear. The MIL will illuminate.
POSSIBLE CAUSES
- Faulty 3-4 Shift Solenoid
- Sticky 3-4 shift valve, 3-4 timing valve, and/or 3-4 quick fill valve
- Internal transmission leakage
- Faulty Overdrive Clutch
- Internal controller failure (PCM)