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P1852

Brake Band Apply Solenoid Low Voltage.

  • Oldsmobile
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
8
AreaTransmission
52
FaultThe specific fault in that area

What it means

P1852 on an Oldsmobile means the transmission control module saw a low voltage condition in the brake band apply solenoid circuit. The module monitors the circuit when it commands the solenoid and sets the code when the voltage is lower than expected. This points to a wiring, connector, solenoid or module driver problem rather than a purely mechanical fault, though exact layout depends on model and transmission.

Symptoms

  • Check engine or transmission warning light on
  • Harsh, delayed or missing gear changes
  • Transmission stuck in a single gear (limp mode)
  • Slipping or flaring between gears
  • Poor fuel economy or sluggish acceleration

Possible causes

  • Damaged, chafed or shorted wiring to the brake band apply solenoidlikely
  • Corroded or loose connector at the transmission or control modulelikely
  • Faulty brake band apply solenoid with internal short or low resistancelikely
  • Internal transmission wiring harness or pass-through connector faultpossible
  • Low or poor battery or charging system voltagepossible
  • Faulty transmission control module output driverrare

How to diagnose

  1. Read all stored codes and freeze frame data, noting battery voltage and conditions when the code set
  2. Check battery condition and charging voltage, and fix any problems before further diagnosis
  3. Check transmission fluid level and condition, looking for burnt smell, debris or contamination
  4. Visually inspect the wiring and connectors between the control module and the transmission for chafing, corrosion, water ingress or pushed-back pins
  5. Measure the solenoid resistance at the transmission connector and compare with the manufacturer specification for your model
  6. Check the solenoid supply and control circuits for short to ground, open circuit or high resistance
  7. Command the solenoid with a scan tool if supported and watch the circuit voltage
  8. Check the internal harness and pass-through connector if external wiring and solenoid test good

How to fix

  • Repair or replace damaged wiring and restore proper insulation
  • Clean or replace corroded or loose connectors and terminals
  • Replace the faulty brake band apply solenoid or solenoid pack as required
  • Replace the internal transmission harness or pass-through connector if faulty
  • Repair the battery or charging system fault
  • Replace or repair the transmission control module only after wiring and solenoid faults are ruled out

Can I keep driving?

Medium severity

The car can usually be driven short distances, but the transmission may be in limp mode and shifting poorly. Get it checked soon, as continued driving with slipping or wrong gear application can cause further transmission wear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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