AutoCodes – Pontiac – P1621 Pontiac

P1621 Pontiac 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 Pontiac 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.

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Code Popularity 6,503

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

What does this mean?

What are the Possible Causes of the DTC P1621 Pontiac?

Faulty Powertrain Control Modules (PCM)
Low car battery voltage

How to Fix the DTC P1621 Pontiac?

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 Pontiac 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.

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Need Help with the Code?

Get the P1621 Pontiac 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 Pontiac Code

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

- Common symptoms include engine misfires, rough idling, reduced fuel efficiency, and potential stalling.

2. What causes the OBDII code P1621 in a Pontiac?

- The most common cause of this code is a fault in the control module's long-term memory, often due to a defective PCM or issues with the wiring.

3. How serious is the OBDII code P1621 in a Pontiac?

- While the code itself may not cause immediate harm, it can lead to drivability issues and potentially affect the overall performance of the vehicle if left unresolved.

4. Can I continue driving my Pontiac with the OBDII code P1621?

- It is not recommended to drive the vehicle with this code present, as it can impact engine performance and fuel efficiency. It's best to address the issue promptly.

5. How can I diagnose the OBDII code P1621 in my Pontiac?

- Diagnosing this code typically involves using an OBDII scanner to read the code, checking for any other related codes, and conducting a thorough inspection of the control module and related components.

6. Is it possible to reset the OBDII code P1621 in a Pontiac?

- While you can clear the code using an OBDII scanner, it is essential to address the underlying issue causing the code to prevent it from reoccurring.

7. What are some repair tips for fixing the OBDII code P1621 in a Pontiac?

- Repair tips may include checking and repairing any damaged wiring, replacing the control module if necessary, and ensuring all connections are secure and functioning properly.

8. Can a DIY enthusiast fix the OBDII code P1621 in a Pontiac?

- Depending on your experience and knowledge, you may be able to address this code yourself by following diagnostic procedures and repair instructions carefully.

9. How much does it typically cost to repair the OBDII code P1621 in a Pontiac?

- The cost of repairs can vary based on the underlying issue causing the code, the need for parts replacement, and whether you choose to address the problem yourself or seek professional help.

10. Will the OBDII code P1621 cause my Pontiac to fail an emissions test?

- Yes, if the code is present during an emissions test, it is likely to cause the vehicle to fail due to potential impacts on engine performance and emissions control systems.