OBD Guide
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P1777

Step Motor Circuit

P1777 is an OBD-II diagnostic trouble code meaning: Step Motor Circuit. Common causes: open or short circuit in the stepper motor circuit, poor contact in connectors. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Incorrect gear shifting
  • Check Engine light comes on
  • Reduced vehicle dynamics
  • Jerks when shifting gears
  • Transmission transition to emergency mode

Causes

  • Open or short circuit in the stepper motor circuit
  • Poor contact in connectors
  • Stepper motor fault
  • Problems with the transmission ECU
  • Wiring harness damage

How to Fix

  1. Check the continuity of the stepper motor circuit
  2. Inspect and clean connector contacts
  3. Check the resistance of the stepper motor windings
  4. Replace the stepper motor if necessary
  5. Check the operation of the transmission ECU

Related codes

P1778P1779P1780

Error P1777 by Vehicle Brand

JaguarMazda

FAQ

What does the P1777 code mean?

P1777 is an OBD-II diagnostic trouble code that indicates: Step Motor Circuit

What causes a P1777 error code?

The most common causes of P1777 include: Open or short circuit in the stepper motor circuit; Poor contact in connectors; Stepper motor fault; Problems with the transmission ECU.

How do I fix a P1777 diagnostic trouble code?

To fix P1777: Check the continuity of the stepper motor circuit. Inspect and clean connector contacts. Check the resistance of the stepper motor windings. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1777?

Yes, but get it checked soon

How much does it cost to fix P1777?

The estimated repair cost for P1777 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat