AutoCodes – Generic – P1694

P1694 Code - No Messages Received From The Powertrain Control Module

Quick Answer

P1694 indicates No Messages Received From The Powertrain Control Module. Common causes include CCD Bus (-) circuit open between Powertrain Control Module (PCM) and Transmission Control Module (TCM), CCD Bus (+) circuit open between PCM and TCM, Transmission CCD bus wiring damaged. 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 indicates No Messages Received From The Powertrain Control Module.
Common causes: Common causes include CCD Bus (-) circuit open between Powertrain Control Module (PCM) and Transmission Control Module (TCM), CCD Bus (+) circuit open between PCM and TCM, Transmission CCD bus wiring damaged.
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 24,788

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
FAQs
Comments
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Code P1694 Description

OBDII Code P1694 - No Messages Received From The Powertrain Control Module - AutoCodes.com — P1694 Code - No Messages Received From The Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC P1694?

CCD Bus (-) circuit open between Powertrain Control Module (PCM) and Transmission Control Module (TCM)
CCD Bus (+) circuit open between PCM and TCM
Transmission CCD bus wiring damaged
Faulty TCM

How to Fix the DTC P1694?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P1694 Buick — Tachometer Circuit High Voltage
P1694 Cadillac — Tachometer Circuit High Voltage
P1694 Chevrolet — Tachometer Circuit High Voltage
P1694 Chrysler — No Messages Received From The Powertrain Control Module
P1694 Dodge — No Messages Received From The Powertrain Control Module
P1694 GMC — Tachometer Circuit High Voltage
P1694 Hyundai — Immobilizer ECU Signal Error
P1694 Jeep — No Messages Received From The Powertrain Control Module

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.

Frequently Asked Questions about P1694 Code

1. What are the common symptoms associated with OBDII code P1694?

- Common symptoms include stalling, rough idle, poor fuel efficiency, and difficulty starting the vehicle.

2. What can cause the OBDII code P1694 to trigger?

- The code may be triggered by a faulty Powertrain Control Module (PCM), damaged wiring, or poor connections in the communication network.

3. How can I diagnose the issue related to code P1694?

- Diagnosing the issue involves checking the wiring harness, connectors, and PCM for any signs of damage or corrosion. Testing the communication network with a scan tool is also recommended.

4. Can a bad battery or alternator cause code P1694 to appear?

- Yes, a weak battery or failing alternator can disrupt communication between the PCM and other modules, potentially triggering code P1694.

5. Are there any common repair tips for addressing code P1694?

- Ensure all connections are secure, repair any damaged wiring, and consider resetting the PCM by disconnecting the battery for a few minutes before reconnecting it.

6. Is it safe to continue driving with OBDII code P1694 present?

- It is not recommended to drive with the code present, as it can lead to further damage to the vehicle and potentially cause unsafe driving conditions.

7. Can a DIY enthusiast fix the issue related to code P1694?

- Depending on the underlying cause, some DIY enthusiasts may be able to address the issue by checking and repairing wiring connections or replacing the PCM if necessary.

8. Will resetting the code make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue causing P1694 is not addressed, the code is likely to reappear.

9. How much can it cost to repair OBDII code P1694 at a mechanic?

- The cost of repairing P1694 can vary depending on the cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

10. Can a vehicle still pass an emissions test with code P1694 present?

- No, a vehicle with an active OBDII code like P1694 is likely to fail an emissions test, as the code indicates a problem with the vehicle's emissions control system.