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Code C0628

Quick reference

C0628 at a glance

Plain-language meaning
This code means that the computer in the car is having trouble controlling how easy or hard it is to turn the steering wheel.
Urgency
Moderate – Steering performance may be affected, but vehicle is still drivable.
Difficulty
Moderate
System
Steering System Issue
Tools mentioned
OBD-II scanner, Multimeter, Wiring repair tools

This summary uses the existing diagnostic information shown in full below.

Laymans terms

This code means that the computer in the car is having trouble controlling how easy or hard it is to turn the steering wheel.

Explanation

The C0628 code indicates a problem with the variable effort steering system, which adjusts the steering feel based on driving conditions.

Technical description

The variable effort steering system uses sensors and a control module to adjust the steering effort required by the driver. This system is designed to provide lighter steering at low speeds and firmer steering at higher speeds. The C0628 code is triggered when the control module detects a performance issue in the system.

Symptoms

• Steering feels too heavy or too light

• Steering wheel does not respond as expected

• Warning light on the dashboard

Common Causes

• Faulty variable effort steering module

• Damaged or corroded wiring or connectors

• Defective steering position sensor

Glossary

Variable Effort Steering: A system that adjusts steering effort based on driving conditions.

OBD-II: On-Board Diagnostics, a system for vehicle self-diagnosis and reporting.

Diagnosis steps

• Check for other related codes

• Inspect the wiring and connectors for damage

• Test the variable effort steering module

Repair procedures

• Replace the variable effort steering module

• Repair or replace damaged wiring

• Recalibrate the steering position sensor

Tools required

• OBD-II scanner

• Multimeter

• Wiring repair tools

Estimated repair cost

$200 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Malibu

• Pontiac Grand Prix

• Buick Regal

Preventive measures

• Regularly inspect steering system components

• Ensure connectors are free from corrosion

• Follow maintenance schedule for steering system

Error code type

Steering System Issue

User experience recommendations

• Avoid driving the vehicle until the issue is fixed

• Consult a professional mechanic for diagnosis

• Do not attempt repairs without proper tools and knowledge

Warranty information

Check vehicle warranty for coverage on steering components

Historical data

This code has been commonly reported in vehicles with electronic steering systems since the early 2000s.

Urgency level

Moderate – Steering performance may be affected, but vehicle is still drivable.

Testing conditions

• Vehicle at various speeds

• Steering wheel movements

Component location

The variable effort steering module is typically located near the steering column or integrated into the power steering system.

FAQs

Q: Can I drive with the C0628 code?
A: It's not recommended as steering performance may be compromised.

Q: How can I reset the C0628 code?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.

Optional diagnostic gear

Tools that may help diagnose C0628

FOXWELL Multi-System Scanner diagnostic tool illustration

Pro · Four-system diagnostics

FOXWELL Multi-System Scanner

A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.

Chassis and ABS faults usually need a scanner that can read brake-system data directly.

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EPAuto 1/2" Torque Wrench diagnostic tool illustration

Universal · Torque wrench

EPAuto 1/2" Torque Wrench

Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.

Useful when wheel, hub, or suspension hardware needs correct reassembly torque.

View on Amazon
MaxxHaul Vehicle Ramps diagnostic tool illustration

Universal · Drive-on ramps

MaxxHaul Vehicle Ramps

Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.

Helpful for safer access during underbody inspection work.

View on Amazon

These are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.

Source: ezOBD2 diagnostic database
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