How to Fix P0605 Code: A Step-by-Step Guide

AvatarByCarl Frisch

P0605 is an OBD-II Diagnostic Trouble Code (DTC) indicating a fault with the Internal Control Module (ECM) Memory Check Sum Error. This code is associated with a malfunction in the ECM’s ability to read and store data. It can be caused by a variety of issues, including a faulty ECM or wiring, or potentially a defective fuel injector.

In order to fix this code, the first step is to diagnose the cause. This can be done by scanning for codes and checking for any stored codes in the computer. If no codes are present, then it may be necessary to inspect the wiring harness and connections to the ECM for any signs of corrosion or damage. If there are any visible problems, then these should be addressed before proceeding.

The next step would be to replace any defective components, such as a faulty fuel injector or ECM. After replacing any parts that may have been causing the issue, it is important to reset the codes in order for them to clear from memory. This can be done by using an OBD-II scanner or disconnecting the battery for several minutes. Once this has been done, it is recommended that you take your vehicle on a test drive in order to ensure that all systems are functioning properly and that no additional codes appear.

P0605 Code: What is it?

The P0605 code is a diagnostic trouble code (DTC) that indicates a problem with the powertrain control module (PCM). This code is set when the PCM detects an internal malfunction in its memory, usually caused by a faulty connection or component.

When this code is set, the Check Engine light will be illuminated on the dash and you may notice other symptoms such as poor engine performance or reduced fuel economy. A qualified technician should be consulted to diagnose and repair this issue.

Diagnosing P0605 Code

In order to diagnose the P0605 code, a qualified technician will need to use specialized diagnostic tools. These tools will allow them to check for any stored trouble codes, as well as inspect wiring, connections, and components of the PCM system.

Testing and inspections should include checking for any loose or corroded connections in the PCM wiring harness, testing each component of the system with an appropriate device such as an ohmmeter or voltmeter, and inspecting all sensors and connectors for damage or corrosion. The technician may also need to perform a visual inspection of the PCM itself to check for any signs of damage or wear.

Common Causes of P0605 Code

The most common cause of P0605 code is poor connections. This can be caused by corrosion on connectors and terminals, a broken wire inside the harness, or loose connections in the wiring harness itself. Other possible causes include faulty components such as sensors, relays, switches, or even a defective PCM itself.

In some cases, this code can also be caused by a software issue with either the vehicle’s operating system or its onboard diagnostic system (OBD-II). If this is suspected to be causing the issue then it should be addressed immediately by having your vehicle’s software updated by a qualified technician.

In conclusion, if your vehicle has illuminated its Check Engine light due to a P0605 code then you should have it inspected immediately by a qualified technician who can properly diagnose and repair this issue before further damage occurs.

P0605 Code: What is it?

The P0605 code is a diagnostic trouble code (DTC) which indicates a problem with the engine control module (ECM). This code may be triggered when the ECM detects an issue in the wiring, components, or computer module that controls the engine’s ignition system. When this code is detected, it will cause the vehicle to run erratically or not at all.

Signs of P0605 Code

When the P0605 code is present, you may experience a number of symptoms, including:
• Erratic or stalling engine performance
• Trouble starting your vehicle
• Engine running rough or misfiring
• Illuminated check engine light
• Poor fuel economy and acceleration.

Causes of P0605 Code

The most common cause of this code is due to corroded wiring, faulty components, and/or a failing computer module. Other causes may include a faulty throttle position sensor (TPS), bad spark plugs or wires, worn out oxygen sensors, or a faulty mass airflow sensor (MAF).

Diagnosing P0605 Code

When diagnosing this code, it is important to use an OBD-II scanner to retrieve any additional codes that may be stored in the ECM. This will help narrow down what component or system is causing the issue. Once any additional codes have been retrieved and addressed if necessary, it is important to visually inspect all wiring and components for any signs of corrosion or damage. If no issues are found during visual inspection, then further testing may be necessary such as checking for fuel pressure issues, checking spark plugs and wires for proper operation and function, testing oxygen sensors and mass airflow sensors for proper operation and function.

Repair Options for P0605 Code

The repair options for this code will depend on what has been found during diagnosis. If corroded wiring or faulty components are found during visual inspection then they should be replaced with new ones. If further testing reveals a failing computer module then it should also be replaced with a new one. Additionally, damaged connectors can often be repaired by replacing them with new connectors and wires.

FAQ & Answers

Q: What is P0605 Code?
A: P0605 Code is an OBD-II Diagnostic Powertrain (P) Trouble Code which indicates a fault within the ECM (Engine Control Module). It occurs when the ECM detects an internal malfunction.

Q: What are the Symptoms of P0605 Code?
A: The symptoms of a P0605 OBD-II trouble code include illuminated Check Engine Light and hesitation when accelerating. Other symptoms may also be present depending on the underlying cause of the code.

Q: What are Common Causes of P0605 Code?
A: Common causes of a P0605 code include poor connections, corroded wiring, faulty components, and a failing computer module.

Q: What Diagnostic Tools are Used for P0605 Code?
A: The most common diagnostic tool used for diagnosing a P0605 code is an OBD-II scanner. This device will allow you to read the stored codes and live data from the vehicle’s computer system in order to diagnose the issue.

Q: What are Repair Options for P0605 Code?
A: Repair options for a P0605 code will vary depending on the underlying cause of the code. Common repair options include replacing connectors and wires, as well as replacing faulty components if necessary.

In conclusion, the P0605 code relates to a fault in the PCM (Powertrain Control Module). This can be caused by a faulty or disconnected battery cable, a shorted or open wiring harness, or a failed PCM. In order to fix this issue, it is important to diagnose and repair the underlying problem. This may involve checking/replacing the battery cables, verifying proper connection of the wiring harnesses, or replacing the PCM. Proper diagnosis and repairs will ensure that your vehicle runs reliably and safely.

Author Profile

Carl Frisch
Carl Frisch
With more than 30 years in the bicycle industry, I have a strong background in bicycle retailing, sales, marketing and customer service. I have a passion for cycling and a dedication to excellence. As a manager, I worked diligently to increase my capabilities and responsibilities, managing up to eleven mechanics (at Palo Alto Bicycles) and later as a working partner in my own store.

As the shop owner of Spoke n’ Word Cycles in Socorro, NM, the success of the mission was my responsibility, which I pursued passionately since we opened in 2003 through the spring of 2011. I am adept at managing owned and loan inventory, preparing weekly & annual inventory statements, and managing staff. The role as managing partner also allowed me tremendous freedom. I used this personal freedom to become more deeply involved in my own advancement as a mechanic, to spearhead local trail building, and advocating for cycling both locally and regionally.

As a mechanic, I have several years doing neutral support, experience as a team mechanic, and experience supporting local rides, races, club events. I consistently strive to ensure that bicycles function flawlessly by foreseeing issues and working with the riders, soigners, coaches and other mechanics. Even with decades of experience as a shop mechanic and team mechanic, and continue to pursue greater involvement in this sport as a US Pro Mechanic, and UCI Pro Mechanic.

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