AutoCodes – Buick – P0605 Buick

P0605 Buick Code - Control Module Programming Read Only Memory Performance

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the device. Common causes include Low battery voltage, Reprogram Powertrain Control Module (PCM), Faulty Powertrain Control Module. 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: P0605 Buick indicates Control Module Programming Read Only Memory Performance.
Common causes: Common causes include Low battery voltage, Reprogram Powertrain Control Module (PCM), Faulty Powertrain Control Module.
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 806

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 Jul 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0605 Buick Description

This diagnostic applies to internal microprocessor integrity conditions within the device. This diagnostic also addresses if the device is not programmed. The device monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved. The Diagnostic Trouble Code (DTC) will be set when the device detects an internal malfunction or incomplete programming.

OBDII Code P0605 Buick - Control Module Programming Read Only Memory Performance - AutoCodes.com — P0605 Buick Code - Control Module Programming Read Only Memory Performance

What does this mean?

What are the Possible Causes of the DTC P0605 Buick?

Low battery voltage
Reprogram Powertrain Control Module (PCM)
Faulty Powertrain Control Module
Powertrain Control Module harness is open or shorted
Powertrain Control Module circuit poor electrical connection

How to Fix the DTC P0605 Buick?

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 P0605 Buick 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 P0605 Buick code?

Need more information on how to fix the P0605 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0605 Buick 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.

Frequently Asked Questions about P0605 Buick Code

1. What does the OBDII code P0605 mean on a Buick?

P0605 indicates an issue with the Control Module Programming Read Only Memory (ROM), meaning the engine control module (ECM) has detected a fault in its internal memory.

2. What are the common symptoms of code P0605 in a Buick?

Symptoms may include the check engine light turning on, poor engine performance, stalling, rough idling, or failure to start.

3. What causes the P0605 code in a Buick?

Common causes include a faulty ECM, corrupted or outdated software, electrical issues like damaged wiring or poor connections, or interference from aftermarket modifications.

4. Can I drive my Buick with the P0605 code?

Driving with this code is not recommended, as it can lead to engine performance issues or leave you stranded if the vehicle fails to start.

5. How is the P0605 code diagnosed in a Buick?

A mechanic will use a scan tool to verify the code, inspect the ECM and its connections, check for software updates, and test the vehicle’s wiring for shorts or damage.

6. How do I fix the P0605 code on my Buick?

Repairs may include reprogramming or updating the ECM, replacing the ECM if it’s faulty, or repairing damaged wiring or connectors.

7. How much does it cost to fix a P0605 code on a Buick?

The cost can range from $150 to $1,200, depending on whether the ECM needs reprogramming or replacement and labor expenses.

8. Can a weak battery cause the P0605 code in a Buick?

Yes, a weak or failing battery can cause voltage irregularities that may trigger this code. Ensure the battery and charging system are in good condition.

9. Is it possible to clear the P0605 code without fixing the problem?

Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely recur and cause further problems.

10. Can a software update fix the P0605 code in a Buick?

In some cases, a software update from the manufacturer can resolve the issue if the problem is related to corrupted or outdated programming in the ECM.