OBD Guide
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P1851

Brake Band Apply Solenoid Performance

P1851 is an OBD-II diagnostic trouble code meaning: Brake Band Apply Solenoid Performance. Common causes: brake band solenoid malfunction, open or short circuit in control circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect gear shifting
  • Gear slip
  • Switching delay
  • Increased engine speed when switching
  • Check Engine light comes on

Causes

  • Brake band solenoid malfunction
  • Open or short circuit in control circuit
  • Poor contact in connectors
  • Low transmission fluid level
  • Contaminated transmission fluid

How to Fix

  1. Check the level and condition of the transmission fluid
  2. Check the integrity of the solenoid control circuit
  3. Check connections and connectors
  4. Test solenoid resistance
  5. If necessary, replace the brake band solenoid

Related codes

P0751P0756P0761

Error P1851 by Vehicle Brand

BuickCadillacChevroletGMGMCOldsmobileSaturnVolkswagen

FAQ

What does the P1851 code mean?

P1851 is an OBD-II diagnostic trouble code that indicates: Brake Band Apply Solenoid Performance

What causes a P1851 error code?

The most common causes of P1851 include: Brake band solenoid malfunction; Open or short circuit in control circuit; Poor contact in connectors; Low transmission fluid level.

How do I fix a P1851 diagnostic trouble code?

To fix P1851: Check the level and condition of the transmission fluid. Check the integrity of the solenoid control circuit. Check connections and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1851?

Yes, but get it checked soon

How much does it cost to fix P1851?

The estimated repair cost for P1851 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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