AutoCodes – GMC – P1694 GMC

P1694 GMC Code - Tachometer Circuit High Voltage

Quick Answer

With the key on, the Powertrain Control Module (PCM) detects an open, short-to-ground or short-to-voltage condition in the Tachometer Circuit. Common causes include Faulty Tachometer, Tachometer harness is open or shorted, Tachometer 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: P1694 GMC indicates Tachometer Circuit High Voltage.
Common causes: Common causes include Faulty Tachometer, Tachometer harness is open or shorted, Tachometer 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,206

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 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1694 GMC Description

With the key on, the Powertrain Control Module (PCM) detects an open, short-to-ground or short-to-voltage condition in the Tachometer Circuit.

OBDII Code P1694 GMC - Tachometer Circuit High Voltage - AutoCodes.com — P1694 GMC Code - Tachometer Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1694 GMC?

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

How to Fix the DTC P1694 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 P1694 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 P1694 GMC code?

Need more information on how to fix the P1694 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1694 GMC code diagnosed by a professional: Find a repair shop in your area

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.