P1847: 2-3 Shift Solenoid High Voltage OBD-II Trouble Code

A shift solenoid is a little spring-loaded device that directs the flow of pressurized transmission fluid, which then actuates a gear change. So in the case of the 2-3 shift solenoid, it activates the 2nd to 3rd gear change. If your vehicle has a P1847 diagnostic trouble code, it means that the ECU has detected a high-voltage condition, which typically means a short or open circuit.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

How Serious is the Code?

The P1847 DTC is a pretty serious code, because it indicates a potentially serious problem. One that can not only cause serious drivability issues, but could also render your vehicle unusable.

Symptoms

Symptoms of a P1847 include:

  • Excessively harsh gear changes
  • Delayed shifts
  • Slipping
  • Vehicle unable to move in a forward gear
  • Limp mode
  • Engine stalling
  • Transmission overheating

Causes

  • Transmission is low on fluid
  • Dirty transmission fluid/filter
  • Blocked hydraulic passages
  • Damaged or corroded wiring/connectors
  • Bad 2-3 shift solenoid
  • Faulty transmission pump

How to Diagnose the Code?

Even though a vehicle may display a P1847 OBDII diagnostic trouble code, the cause might be as simple as dirty transmission fluid or a clogged transmission filter. If the ATF is in good condition, then all the wiring and connectors on the transmission wiring harness should be examined for signs of corrosion or a short. Should no issues be found at this point, the 2-3 shift solenoid could be to blame.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

What Repairs Will Fix P1847?

  • Service the transmission (i.e. change the transmission fluid/filter)
  • Repair or replace damaged wiring/connectors
  • Replace the 1-2 shift solenoid
  • Repair or replace the transmission pump
  • Repair or replace the valve body

Related Codes

P1845 – 2-3 Shift Solenoid Low Voltage