AutoCodes – Buick – P1621 Buick

P1621 Buick Code - Control Module Long Term Memory Performance Condition

Quick Answer

The Powertrain Control Modules (PCM) Electronically Erasable Programmable Read Only Memory (EEPROM) contains data essential to running the engine and transmission. Common causes include Faulty Powertrain Control Modules (PCM), Low car battery voltage. 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: P1621 Buick indicates Control Module Long Term Memory Performance Condition.
Common causes: Common causes include Faulty Powertrain Control Modules (PCM), Low car battery voltage.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,057

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1621 Buick Description

The Powertrain Control Modules (PCM) Electronically Erasable Programmable Read Only Memory (EEPROM) contains data essential to running the engine and transmission. The PCM stores critical preprogrammed data within the EEPROM, this data remains even if the vehicles' battery is disconnected. At power up, the PCM checks the integrity of this data.

OBDII Code P1621 Buick - Control Module Long Term Memory Performance Condition - AutoCodes.com — P1621 Buick Code - Control Module Long Term Memory Performance Condition

What does this mean?

What are the Possible Causes of the DTC P1621 Buick?

Faulty Powertrain Control Modules (PCM)
Low car battery voltage

How to Fix the DTC P1621 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 P1621 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 P1621 Buick code?

Need more information on how to fix the P1621 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1621 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 P1621 Buick Code

1. What are the common symptoms of OBDII code P1621 in a Buick?

- Common symptoms include engine performance issues, stalling, rough idling, and the illumination of the Check Engine Light.

2. What does the OBDII code P1621 Buick indicate?

- This code indicates a Control Module Long Term Memory Performance Condition, suggesting a potential issue with the engine control module's long-term memory function.

3. What are some possible causes of OBDII code P1621 in a Buick?

- Possible causes include a faulty engine control module (ECM), poor electrical connections, software issues, or a programming error.

4. How can I diagnose the cause of OBDII code P1621 in my Buick?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve freeze frame data and perform thorough inspections of the ECM, wiring, and connectors.

5. Can I continue driving my Buick with OBDII code P1621 present?

- It is not recommended to continue driving with this code present, as it may lead to further engine damage or performance issues.

6. How can I repair OBDII code P1621 in my Buick?

- Repairing this code may involve reprogramming the ECM, replacing faulty components, ensuring proper electrical connections, or seeking assistance from a qualified mechanic.

7. Is it possible to reset OBDII code P1621 in a Buick without addressing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent the code from reoccurring and potential engine problems.

8. Are there any DIY tips for addressing OBDII code P1621 in a Buick?

- DIY tips may include checking and cleaning electrical connections, ensuring proper ECM mounting, and following manufacturer-specific diagnostic procedures.

9. How much can I expect to pay to repair OBDII code P1621 in a Buick?

- Repair costs for this code can vary depending on the exact cause and required repairs, but it is advisable to budget for diagnostic fees and potential parts replacement costs.

10. How long does it typically take to repair OBDII code P1621 in a Buick?

- The repair time can vary based on the complexity of the issue, availability of parts, and the expertise of the technician, but it may range from a few hours to a day.