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P1770 Toyota Code - Differential Lock Solenoid Circuit Malfunction

Quick Answer

The Differential Lock Solenoid or SLD Solenoid controls hydraulic pressure applied to the center differential clutch and maintains a limited-slip differential level. Common causes include Faulty SLD Solenoid (Differential Lock Solenoid), SLD Solenoid harness is open or shorted, SLD Solenoid circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1770 Toyota indicates Differential Lock Solenoid Circuit Malfunction.
Common causes
Common causes include Faulty SLD Solenoid (Differential Lock Solenoid), SLD Solenoid harness is open or shorted, SLD Solenoid circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 12,625
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Aug 25, 2021
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Code P1770 Toyota Description

The Differential Lock Solenoid or SLD Solenoid controls hydraulic pressure applied to the center differential clutch and maintains a limited-slip differential level. The Engine Control Module (ECM) determines optimum operating pressure according to signals from the throttle position sensor, and front and rear speed sensors, and controls the volume of current flow to the SLD solenoid. The Diagnostic Trouble Code (DTC) is set when the SLD solenoid output signal is on for 3.3 milliseconds or more with a duty ratio of at least 5 percent.
OBDII Code P1770 Toyota - Differential Lock Solenoid Circuit Malfunction - AutoCodes.com
P1770 Toyota Code - Differential Lock Solenoid Circuit Malfunction
What does this mean?

What are the Possible Causes of the DTC P1770 Toyota?

  • Faulty SLD Solenoid (Differential Lock Solenoid)
  • SLD Solenoid harness is open or shorted
  • SLD Solenoid circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P1770 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1770 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1770 Toyota code?

Need more information on how to fix the P1770 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1770 Toyota Code

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