OBD Guide
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P1878

Transmission Transfer Case Disengaged Solenoid Circuit Failure

P1878 is an OBD-II diagnostic trouble code meaning: Transmission Transfer Case Disengaged Solenoid Circuit Failure. Common causes: open or short circuit in solenoid circuit, transfer case solenoid malfunction. Estimated repair cost: $28–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$28–89 (est.)

Symptoms

  • Check Engine Light Is On
  • Problems with switching all-wheel drive modes
  • The car goes into emergency mode
  • Reduced vehicle dynamics
  • Possible jerking when moving

Causes

  • Open or short circuit in solenoid circuit
  • Transfer case solenoid malfunction
  • Solenoid relay problems
  • Transmission control unit malfunction
  • Poor contact in wiring connectors

How to Fix

  1. Diagnostics of the solenoid circuit with a multimeter
  2. Checking Solenoid Resistance
  3. Inspect wiring and connectors for damage
  4. Replacing a faulty solenoid
  5. Resetting the error code and checking the system

Related codes

P1876P1877P1879

FAQ

What does the P1878 code mean?

P1878 is an OBD-II diagnostic trouble code that indicates: Transmission Transfer Case Disengaged Solenoid Circuit Failure

What causes a P1878 error code?

The most common causes of P1878 include: Open or short circuit in solenoid circuit; Transfer case solenoid malfunction; Solenoid relay problems; Transmission control unit malfunction.

How do I fix a P1878 diagnostic trouble code?

To fix P1878: Diagnostics of the solenoid circuit with a multimeter. Checking Solenoid Resistance. Inspect wiring and connectors for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1878?

Limited driving only, diagnose soon

How much does it cost to fix P1878?

The estimated repair cost for P1878 is $28–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat