Some automatic transmissions the use something called a transmission band to stop a clutch drum from spinning so a gear change can take place. This squeezing action happens when the brake band apply solenoid gets activated by the computer and sends pressurized hydraulic fluid down the right channel to activate the transmission band. If an unusually high voltage is detected from this solenoid, then a P1853 diagnostic trouble code will be saved.
How Serious is the Code?
If a vehicle has a P1853 DTC, then the transmission may not be able to change gears when it needs to. This cannot only affect performance, but it can make the vehicle unsafe to drive in traffic.
Symptoms of a P1853 include:
- Transmission slipping between gears
- Shifts happen much later than normal
- Erratic shifting behavior
- Unusual burning smell coming from the transmission
- Transmission overheating
- Check engine light
- Dirty transmission fluid & filter
- Clogged passages inside the transmission
- Valve body issues
- Damaged or corroded wiring/connectors
- Broken brake band apply solenoid
How to Diagnose the Code?
To properly diagnose a P1853 OBDII diagnostic trouble code, your mechanic should first look at the condition of the transmission fluid, as this can have a major impact on the way the brake band apply solenoid works. If the transmission fluid is in good condition, then the wiring and connectors on the transmission wiring harness should be thoroughly inspected. If no issues are found there, the brake band apply solenoid is most likely at fault.
What Repairs Will Fix P1853?
- Change the transmission fluid and filter (service the transmission)
- Replace or repair damage wiring/connectors
- Replace brake band apply solenoid
P1850 – Brake Band Apply Solenoid Circuit
P1851 – Brake Band Apply Solenoid Performance
P1852 – Brake Band Apply Solenoid Low Voltage