P1621 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 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 Description
What are the Possible Causes of the DTC P1621?
- Faulty Powertrain Control Modules (PCM)
- Low car battery voltage
How to Fix the DTC P1621?
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 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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Information for Specific Makes
- P1621 Audi — Instrument Panel Engine Coolant Temperature Signal Short To Ground
- P1621 Buick — Control Module Long Term Memory Performance Condition
- P1621 Cadillac — Control Module Long Term Memory Performance Condition
- P1621 Chevrolet — Control Module Long Term Memory Performance Condition
- P1621 Dodge — Oxygen Sensor Reference Voltage Circuit Low
- P1621 GMC — Control Module Long Term Memory Performance Condition
- P1621 Hyundai — Fuel Cut Valve Malfunction
- P1621 Isuzu — Engine Control Module Internal Memory Performance
- P1621 Jaguar — Engine Control Module Internal Memory Performance
- P1621 Mazda — Engine Control Module Incorrect Immobilizer Code After Cranking
- P1621 Pontiac — Control Module Long Term Memory Performance Condition
- P1621 RAM — Oxygen Sensor Reference Voltage Circuit Low
- P1621 Saab — Control Module Long Term Memory Performance
- P1621 Saturn — Control Module Long Term Memory Performance Condition
Frequently Asked Questions about P1621 Code
1. What are the common symptoms of OBDII code P1621?
- Common symptoms include engine stalling, rough idling, poor fuel efficiency, and issues with acceleration.
2. What are the possible causes of OBDII code P1621?
- Possible causes include a faulty control module, wiring issues, software glitches, or a powertrain control module (PCM) failure.
3. How can I diagnose the OBDII code P1621?
- Diagnosing this code typically involves using a scan tool to read the code and perform a thorough inspection of the control module and related wiring.
4. What are some repair tips for fixing OBDII code P1621?
- Repair tips may include checking and repairing any damaged wiring, resetting the control module, updating software if applicable, or replacing the control module.
5. Can OBDII code P1621 cause long-term damage to my vehicle?
- While the code itself may not cause immediate harm, prolonged issues related to this code can lead to engine performance problems and potential long-term damage if left unresolved.
6. Is it safe to continue driving with OBDII code P1621 present?
- It is not recommended to continue driving with this code present, as it can lead to worsening engine performance and potential safety hazards.
7. How much does it typically cost to repair OBDII code P1621?
- The cost of repairing this code can vary depending on the underlying cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.
8. Can I fix OBDII code P1621 by myself, or do I need a professional mechanic?
- While some DIY enthusiasts may be able to address simpler causes of this code, diagnosing and repairing more complex issues may require the expertise of a professional mechanic.
9. Will resetting the OBDII code P1621 resolve the issue permanently?
- Resetting the code may temporarily clear the warning, but if the underlying problem is not addressed, the code is likely to reappear, indicating an unresolved issue.
10. How can I prevent OBDII code P1621 from occurring in the future?
- Regular vehicle maintenance, such as keeping the control module updated and checking for wiring issues, can help prevent the recurrence of OBDII code P1621.
1. What are common symptoms of OBDII code P1621?
Symptoms may include rough idling, stalling, decreased fuel efficiency, and difficulties starting the vehicle.
2. What causes OBDII code P1621 to trigger?
This code is typically triggered by issues related to the control module long term memory, such as a faulty control module or a disruption in the memory data.
3. How can I diagnose the cause of OBDII code P1621?
Diagnosis usually involves using an OBDII scanner to read the code, checking for any other related codes, and performing a thorough inspection of the control module and related components.
4. Is it safe to continue driving with OBDII code P1621 present?
It is not recommended to continue driving with this code present, as it can lead to further damage to the vehicle and potentially unsafe driving conditions.
5. How can I repair OBDII code P1621?
Repair options may include resetting the control module, replacing a faulty control module, repairing wiring or connections, or updating the control module software.
6. Can a DIY enthusiast fix OBDII code P1621?
While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing this code may require advanced technical knowledge and specialized tools. It is recommended to consult a professional mechanic for assistance.
7. How much does it cost to repair OBDII code P1621?
The cost of repairing this code can vary depending on the underlying cause, the extent of the damage, and the labor rates of the repair shop. It is advisable to obtain quotes from multiple mechanics to compare prices.
8. Can a low battery voltage trigger OBDII code P1621?
Yes, a low battery voltage can disrupt the control module's long term memory performance and potentially trigger this code. Ensuring the battery is in good condition is important for proper vehicle operation.
9. Will OBDII code P1621 cause my vehicle to fail an emissions test?
Yes, this code can indicate issues with the vehicle's emissions control system, which may result in a failed emissions test. It is important to address and repair the underlying cause of the code to pass the test.
10. How often does OBDII code P1621 occur in vehicles?
The occurrence of this code can vary depending on the vehicle's make and model, as well as its age and maintenance history. It is not one of the most common codes but can still be encountered in some vehicles experiencing control module issues.
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