AutoCodes – GMC – P1550 GMC

P1550 GMC Code - Stepper Motor Cruise Control Fault

Quick Answer

With the engine running, the Stepper Motor Cruise Control (SMCC) Cruise commanded off, the Powertrain Control Module (PCM) detects that the Cruise Status input indicated that the Cruise Control was engaged. Common causes include Faulty Stepper Motor Cruise Control, Stepper Motor Cruise Control harness is open or shorted, Stepper Motor Cruise Control circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1550 GMC indicates Stepper Motor Cruise Control Fault.
Common causes: Common causes include Faulty Stepper Motor Cruise Control, Stepper Motor Cruise Control harness is open or shorted, Stepper Motor Cruise Control circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 2,845

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1550 GMC Description

OBDII Code P1550 GMC - Stepper Motor Cruise Control Fault - AutoCodes.com — P1550 GMC Code - Stepper Motor Cruise Control Fault

What does this mean?

What are the Possible Causes of the DTC P1550 GMC?

Faulty Stepper Motor Cruise Control
Stepper Motor Cruise Control harness is open or shorted
Stepper Motor Cruise Control circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1550 GMC?

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 P1550 GMC 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 P1550 GMC 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.