AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Chevrolet - P1621 Chevrolet

P1621 Chevrolet Code - Control Module Long Term Memory Performance Condition

- Code Popularity: 45,171 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P1621 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Powertrain Control Modules (PCM)
  • Low car battery voltage
⚠ Does your Chevrolet have Safety Recalls? → Check here

How to Fix the DTC P1621 Chevrolet?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P1621 Chevrolet Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1621 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

If the checksum of the Electronically Erasable Programmable Read Only Memory (EEPROM) does not match a predetermined value by the Powertrain Control Modules (PCM), DTC P1621 will set.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

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

Need More Information on the Code?

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

Need Help with the Code?

Get the P1621 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Code P1621 Chevrolet comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P1621 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks