AutoCodes – Cadillac – P1662 Cadillac

P1662 Cadillac Code - Cruise Control Inhibit Control Circuit Conditions

Quick Answer

Quad Driver Modules (QDM) are used by Powertrain Control Module (PCM) to turn on current driven devices needed to control various engine and transaxle functions. Common causes include Check Servo Motor Cruise Control (SMCC) module ignition feed fuse, Faulty Servo Motor Cruise Control (SMCC) module, Servo Motor Cruise Control (SMCC) module harness is open or shorted. 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: P1662 Cadillac indicates Cruise Control Inhibit Control Circuit Conditions.
Common causes: Common causes include Check Servo Motor Cruise Control (SMCC) module ignition feed fuse, Faulty Servo Motor Cruise Control (SMCC) module, Servo Motor Cruise Control (SMCC) module harness is open or shorted.
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 3,067

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1662 Cadillac Description

Quad Driver Modules (QDM) are used by Powertrain Control Module (PCM) to turn on current driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 outputs, including cruise inhibit driver circuit, by supplying ground to the device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM detects an improper voltage level in output circuit controlling the stepper motor cruise control inhibit circuit, the P1662 code will set.

OBDII Code P1662 Cadillac - Cruise Control Inhibit Control Circuit Conditions - AutoCodes.com — P1662 Cadillac Code - Cruise Control Inhibit Control Circuit Conditions

What does this mean?

What are the Possible Causes of the DTC P1662 Cadillac?

Check Servo Motor Cruise Control (SMCC) module ignition feed fuse
Faulty Servo Motor Cruise Control (SMCC) module
Servo Motor Cruise Control (SMCC) module harness is open or shorted
Servo Motor Cruise Control (SMCC) module circuit poor electrical connection

How to Fix the DTC P1662 Cadillac?

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 P1662 Cadillac 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.

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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.