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OBD Code P1879

Transmission Transfer Case Disengaged Solenoid Open Circuit

CodeP1879
DescriptionTransmission Transfer Case Disengaged Solenoid Open Circuit
SystemTransmission

What Does P1879 Mean?

Transmission Transfer Case Disengaged Solenoid Open Circuit. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the transmission.

Code Breakdown

P = Powertrain code

1 = Manufacturer-specific

How to Fix P1879

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check transmission fluid level and condition — dark, burnt-smelling fluid indicates internal wear.
  2. Inspect the transmission wiring harness and connectors (especially the main connector at the case).
  3. Check the transmission range sensor (PRNDL switch) for proper operation.
  4. Test solenoids by commanding them with a scan tool.
  5. Check for TSBs — many transmission codes are resolved with a TCM software update.
  6. If shifting issues persist after electrical checks, internal transmission repair may be needed.
  7. Clear codes and test drive through all gears.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P1879 serious?

Yes — P1879 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear P1879 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P1879?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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