P1621 Chevrolet 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 Chevrolet 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.
Code P1621 Chevrolet Description
What are the Possible Causes of the DTC P1621 Chevrolet?
- Faulty Powertrain Control Modules (PCM)
- Low car battery voltage
How to Fix the DTC P1621 Chevrolet?
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 Chevrolet 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 Chevrolet 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
Frequently Asked Questions about P1621 Chevrolet Code
1. What are common symptoms of OBDII code P1621 in a Chevrolet?
Symptoms may include engine stalling, rough idling, poor acceleration, and an illuminated Check Engine Light.
2. What can cause the OBDII code P1621 in a Chevrolet?
Possible causes include a faulty control module, damaged wiring, poor electrical connections, or a software issue.
3. How can I diagnose the OBDII code P1621 in my Chevrolet?
Diagnosis typically involves using a diagnostic scanner to retrieve the code, inspecting the control module and wiring, and testing the system for any faults.
4. Can I drive my Chevrolet with the OBDII code P1621?
It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety issues.
5. How can I repair the OBDII code P1621 in my Chevrolet?
Repairing this code may involve replacing the control module, repairing damaged wiring, ensuring proper electrical connections, or updating the software.
6. Is it safe to reset the Check Engine Light after fixing the OBDII code P1621?
Yes, once the issue causing the code has been resolved, you can safely reset the Check Engine Light using a diagnostic scanner.
7. Will disconnecting the battery reset the OBDII code P1621 in my Chevrolet?
Disconnecting the battery may temporarily clear the code, but it is recommended to diagnose and repair the underlying issue to prevent it from reoccurring.
8. How much does it cost to fix the OBDII code P1621 in a Chevrolet?
The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred to a few thousand dollars.
9. Can I fix the OBDII code P1621 in my Chevrolet myself?
If you have the necessary tools, knowledge, and skills, you may be able to fix this code yourself. Otherwise, it is recommended to consult a professional mechanic.
10. How long does it take to repair the OBDII code P1621 in a Chevrolet?
The repair time can vary based on the cause of the code and the complexity of the fix. It may take anywhere from a few hours to a full day to complete the repair.
Discuss the causes and fixes for P1621 Chevrolet OBDII Code
-
Start by checking the vehicle battery. If battery and charging system is OK, then the problem is the Powertrain Control Modules (PCM).
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My 2003 6.6 duramax is throwing the code p1621. I pulled a camper amd it was running hot on both the engine and trans .i unhooked the trailer and when I went to park it it died. Nownit only cranks over and wont fire and throwing the code. Any ideas before dumping money into parts that I'm not sure that's what the cause is
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You could try reprogramming the Powertrain Control Module (PCM), If the PCM fails to reprogram, then you must replace the PCM.
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