AutoCodes – Generic – P1674

P1674 Code - Control Module Software Corrupted

Quick Answer

The Throttle Actuator Control (TAC) system is in the Failure Mode Effects Management (FMEM) mode of forced engine shutdown. Common causes include Software incompatibility issue, Damaged Powertrain Control Module (PCM). 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: P1674 indicates Control Module Software Corrupted .
Common causes: Common causes include Software incompatibility issue, Damaged Powertrain Control Module (PCM).
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 23,168

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 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1674 Description

The Throttle Actuator Control (TAC) system is in the Failure Mode Effects Management (FMEM) mode of forced engine shutdown. Indicates an error occurred in the Powertrain Control Module (PCM). This code sets in combination with P2105.

OBDII Code P1674 - Control Module Software Corrupted - AutoCodes.com — P1674 Code - Control Module Software Corrupted

What does this mean?

What are the Possible Causes of the DTC P1674?

Software incompatibility issue
Damaged Powertrain Control Module (PCM)

How to Fix the DTC P1674?

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 P1674 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 P1674 code?

Need more information on how to fix the P1674 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1674 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1674 Audi — CAN Data Bus Instrumentation Incorrect Signal
P1674 Buick — Tachometer Control Circuit
P1674 Cadillac — Tachometer Control Circuit
P1674 Chevrolet — Tachometer Control Circuit
P1674 Ford — Control Module Software Corrupted
P1674 GMC — Tachometer Control Circuit
P1674 Hyundai — A/C Fan Relay Malfunction
P1674 Land Rover — Engine Anti-Theft Signal
P1674 Lincoln — Control Module Software Corrupted
P1674 Mercury — Control Module Software Corrupted
P1674 Volkswagen — CAN Data Bus Instrumentation Incorrect Signal

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 P1674 Code

1. What are common symptoms of OBDII code P1674 (Control Module Software Corrupted)?

- Common symptoms include the check engine light illuminating, poor engine performance, and potential issues with vehicle starting.

2. What can cause the OBDII code P1674 to trigger?

- The code P1674 is typically triggered when there is corruption or malfunction in the software of the control module, often due to electrical issues or software glitches.

3. How serious is the OBDII code P1674?

- While the code itself may not lead to immediate vehicle breakdown, it can affect engine performance and should be addressed promptly to prevent further damage.

4. What are possible DIY repair tips for OBDII code P1674?

- DIY repair tips may include checking and cleaning electrical connections, resetting the control module, or updating the software if available.

5. Can driving with OBDII code P1674 cause further damage to the vehicle?

- Continuing to drive with the code P1674 may potentially worsen engine performance and fuel efficiency over time, leading to more severe issues if left unresolved.

6. How can a mechanic diagnose OBDII code P1674?

- A mechanic can diagnose the code using a diagnostic scanner to retrieve the specific error codes and then further inspect the control module for software corruption.

7. Is it safe to reset the OBDII code P1674 on my own?

- It is safe to attempt to reset the code on your own, but if the underlying issue is not addressed, the code is likely to reappear, requiring further investigation.

8. Can a software update fix the OBDII code P1674 issue?

- In some cases, a software update provided by the manufacturer can resolve the control module software corruption issue triggering the OBDII code P1674.

9. How much does it typically cost to repair OBDII code P1674 at a repair shop?

- The cost of repairing OBDII code P1674 can vary depending on the extent of the issue and the labor rates of the repair shop, but it may range from $100 to $300 or more.

10. Is it possible to prevent OBDII code P1674 from occurring in the future?

- Regular maintenance, including checking electrical connections and updating software as recommended by the manufacturer, can help prevent the recurrence of OBDII code P1674.