In order to control the timing of each gear change, little shift solenoids are employed. These electrically activated pistons control the movement of pressurized hydraulic fluid/ATF inside of the valve body for the purpose of actuating shifts. If this particular shift solenoid is not performing the way that it should, and P1886 DTC will be stored inside of the ECU memory.
How Serious is the Code?
A P1886 diagnostic trouble code is particularly serious, as it can indicate the potential for major drivability issues.
Symptoms of a P1886 include:
- Rough or nonexistent 3-2 downshift
- Erratic shifting behavior
- Getting stuck in a gear
- Dirty transmission fluid/filter
- Failed transaxle shift timing solenoid
- Damage to wiring or connectors
- ECU/TCM problems
How to Diagnose the Code?
The first thing to do when diagnosing a P1886 DTC is to check the level and condition of the transmission fluid. If no issues are found, then the wiring and connectors on the transmission wiring harness will need to be inspected for signs of damage or corrosion. If no problems are found, then the transaxle shift timing solenoid will need to be tested.
What Repairs Will Fix P1886?
- Service the transmission
- Replace or repair damaged wiring/connectors
- Replace transaxle shift timing solenoid
- Repair or replace ECU/TCM