AutoCodes – Saturn – P1621 Saturn

P1621 Saturn 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 Saturn 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 6,837

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

What does this mean?

What are the Possible Causes of the DTC P1621 Saturn?

Faulty Powertrain Control Modules (PCM)
Low car battery voltage

How to Fix the DTC P1621 Saturn?

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

Need Help with the Code?

Get the P1621 Saturn 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 Saturn Code

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

- Common symptoms include rough idling, poor engine performance, and potentially stalling while driving.

2. What can cause the OBDII code P1621 in a Saturn?

- This code is typically caused by a faulty engine control module (ECM) or a problem with the long-term memory within the ECM.

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

- While the vehicle may still be drivable with this code, it is important to address it promptly to prevent potential further damage to the engine.

4. Can I still drive my Saturn with the OBDII code P1621?

- It is generally not recommended to continue driving the vehicle with this code present, as it can lead to more severe issues if left unresolved.

5. How do I repair the OBDII code P1621 in my Saturn?

- The most common repair for this code is to replace the faulty ECM with a new one and reprogram it to the vehicle's specifications.

6. Are there any DIY tips for fixing the OBDII code P1621 in a Saturn?

- Due to the complexity of the repair involving the ECM, it is best to have a qualified mechanic diagnose and fix this issue.

7. Can resetting the ECM clear the OBDII code P1621 in a Saturn?

- Resetting the ECM may temporarily clear the code, but it is likely to return if the underlying issue with the long-term memory performance is not addressed.

8. How much does it cost to repair the OBDII code P1621 in a Saturn?

- The cost of repairing this code can vary depending on the labor rates and parts prices, but it typically involves replacing the ECM, which can be a significant expense.

9. Will the OBDII code P1621 cause my Saturn to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test, as it indicates a problem with the engine control module's long-term memory performance.

10. How long does it take to fix the OBDII code P1621 in a Saturn?

- The repair time can vary depending on the mechanic's experience and availability of parts, but it usually takes a few hours to replace and reprogram the ECM.