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P1853

Brake Band Apply Solenoid High Voltage.

  • Cadillac
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
8
AreaTransmission
53
FaultThe specific fault in that area

What it means

P1853 on a Cadillac means the transmission control module saw a high voltage on the brake band apply solenoid circuit, higher than expected for the commanded state. This points to an electrical fault in the solenoid, its wiring or the control module driver rather than a proven mechanical failure. The exact solenoid and circuit layout depend on the model and transmission fitted.

Symptoms

  • Transmission warning or check engine light on
  • Harsh, delayed or missing gear engagement
  • Transmission stuck in one gear (limp mode)
  • Poor or no engine braking in a lower gear
  • Erratic or flared shifts
  • Reduced fuel economy

Possible causes

  • Open circuit or high resistance in the solenoid wiring or connector (corrosion, chafed or pushed-out terminals)likely
  • Faulty brake band apply solenoid (open winding or internal fault)likely
  • Wiring short to a voltage supply on the solenoid control circuitpossible
  • Damaged or leaking internal transmission wiring harness or pass-through connectorpossible
  • Low or poor-quality transmission fluid, or fluid contamination affecting the solenoid and connectorpossible
  • Faulty transmission control module driver circuitrare

How to diagnose

  1. Read all stored and pending codes and note the freeze frame data, including voltage, gear and temperature, to see when the fault set.
  2. Check the battery and charging system voltage, as a poor supply can cause voltage-related faults and false codes.
  3. Check the transmission fluid level and condition against the manufacturer's procedure, looking for burnt smell, debris or contamination.
  4. Inspect the transmission external connector and harness for corrosion, damaged pins, chafing, fluid ingress and heat damage.
  5. Check the solenoid resistance at the connector and compare it with the manufacturer's specification for your model.
  6. With the connector disconnected, check the control circuit for a short to voltage and for continuity back to the control module.
  7. Wiggle-test the harness with live data or a monitor to look for intermittent faults.
  8. Check for related software updates or technical bulletins for your model and transmission before replacing the control module.

How to fix

  • Repair or replace damaged wiring, terminals or connectors on the solenoid circuit.
  • Replace the brake band apply solenoid, or the solenoid assembly if it is only supplied as one on your transmission.
  • Repair any short to voltage in the circuit and secure the harness away from sources of heat or chafing.
  • Replace the internal transmission harness or connector if it is damaged or leaking.
  • Correct the fluid level or replace contaminated fluid and filter as the manufacturer specifies.
  • Replace or repair the transmission control module only after the wiring and solenoid have been proven good.

Can I keep driving?

Medium severity

The car may be driveable, but the transmission could go into limp mode or shift harshly, and continued driving risks further transmission wear. Have it checked soon and avoid heavy loads or long journeys until it is fixed.

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

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