AutoCodes – Volvo – P1618 Volvo

P1618 Volvo Code - Wiring Cable Fault Between AW TCM And ECM

Quick Answer

P1618 Volvo indicates Wiring Cable Fault Between AW TCM And ECM. Common causes include Engine Control Module (ECM) to Transmission Control Module (TCM) harness is open or shorted, Engine Control Module (ECM) to Transmission Control Module (TCM) 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: P1618 Volvo indicates Wiring Cable Fault Between AW TCM And ECM.
Common causes: Common causes include Engine Control Module (ECM) to Transmission Control Module (TCM) harness is open or shorted, Engine Control Module (ECM) to Transmission Control Module (TCM) 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 16,205

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 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1618 Volvo Description

OBDII Code P1618 Volvo - Wiring Cable Fault Between AW TCM And ECM - AutoCodes.com — P1618 Volvo Code - Wiring Cable Fault Between AW TCM And ECM

What does this mean?

What are the Possible Causes of the DTC P1618 Volvo?

Engine Control Module (ECM) to Transmission Control Module (TCM) harness is open or shorted
Engine Control Module (ECM) to Transmission Control Module (TCM) circuit poor electrical connection

How to Fix the DTC P1618 Volvo?

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 P1618 Volvo 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 P1618 Volvo 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.

Frequently Asked Questions about P1618 Volvo Code

1. What are the common symptoms of OBDII code P1618 in a Volvo related to a wiring cable fault between AW TCM and ECM?

The common symptoms include erratic shifting, transmission slipping, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code P1618 in a Volvo indicating a wiring cable fault between AW TCM and ECM?

The likely causes include damaged or corroded wiring, loose connections, or a short circuit between the transmission control module (TCM) and engine control module (ECM).

3. How can I diagnose a wiring cable fault between AW TCM and ECM causing OBDII code P1618 in my Volvo?

You can diagnose the issue by visually inspecting the wiring harness, checking for continuity using a multimeter, and performing a wiggle test to identify any intermittent faults.

4. Can I repair a wiring cable fault causing OBDII code P1618 in my Volvo myself?

If you have experience with automotive electrical systems and the necessary tools, you may be able to repair the fault by repairing or replacing the damaged wiring and ensuring proper connections.

5. Is it safe to continue driving my Volvo with OBDII code P1618 indicating a wiring cable fault between AW TCM and ECM?

It is not recommended to drive your vehicle with this fault, as it can lead to further damage to the transmission or engine components. It is best to address the issue promptly.

6. How much does it typically cost to repair a wiring cable fault related to OBDII code P1618 in a Volvo?

The cost of repair can vary depending on the extent of the damage and whether you choose to do the repair yourself or take it to a professional. It may range from a few hundred dollars to over a thousand dollars.

7. Can a faulty sensor cause OBDII code P1618 in a Volvo, or is it always related to a wiring cable fault?

While a faulty sensor can sometimes trigger this code, OBDII code P1618 in a Volvo is commonly associated with a wiring cable fault between the AW TCM and ECM.

8. How long does it typically take to repair a wiring cable fault causing OBDII code P1618 in a Volvo?

The repair time can vary depending on the complexity of the wiring harness and the accessibility of the components. It may take a few hours to a full day to complete the repair.

9. Are there any preventive measures I can take to avoid encountering OBDII code P1618 in my Volvo due to a wiring cable fault?

Regularly inspecting the wiring harness for signs of damage, ensuring proper connections, and addressing any electrical issues promptly can help prevent the occurrence of this fault.

10. Can resetting the OBDII code P1618 in my Volvo temporarily resolve the issue related to the wiring cable fault between AW TCM and ECM?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the fault. It is crucial to diagnose and repair the wiring cable fault to prevent further problems.