AutoCodes – GMC – P1657 GMC

P1657 GMC Code - Skip Shift 1 To 4 Upshift System Control Circuit

Quick Answer

With the engine speed over 600 rpm, the Powertrain Control Module (PCM) detects the commanded state of the Upshift driver and the Actual state of the control circuit did not match, all conditions met for over 5 seconds. Common causes include Faulty Solenoid, Solenoid harness is open or shorted, 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: P1657 GMC indicates Skip Shift 1 To 4 Upshift System Control Circuit.
Common causes: Common causes include Faulty Solenoid, Solenoid harness is open or shorted, 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 4,596

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1657 GMC Description

OBDII Code P1657 GMC - Skip Shift 1 To 4 Upshift System Control Circuit - AutoCodes.com — P1657 GMC Code - Skip Shift 1 To 4 Upshift System Control Circuit

What does this mean?

What are the Possible Causes of the DTC P1657 GMC?

Faulty Solenoid
Solenoid harness is open or shorted
Solenoid circuit poor electrical connection

How to Fix the DTC P1657 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 P1657 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 P1657 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.