What does Engine code P1621 mean?

If the checksum of the EEPROM does not match a predetermined value, DTC P1621 will set. The DTC will also set if the VCM/PCM is unable to correctly read or finds corrupt data from the EEPROM.

Is the 6.6 LLY Duramax good?

Similar to the LB7, the LLY Duramax is reliable, powerful, and lacks most of the emissions found on modern day diesel trucks like the L5P. LLY Duramax trucks don’t suffer from the same injector failure problems that LB7 trucks frequently had. Instead, many LLY Duramax problems stem from overheating.

What is the best year of Duramax?

Any generation duramax will pull a 3 horse trailer handily. They all have their own quirks and issues that can be resolved, and once they are, you’ve got a reliable, strong truck for many miles. Most will say the 06-07 LBZ model to be the most desirable and reliable platform.

What is the best generation of Duramax?

The Duramax L5P, the current model first released in the 2017 model year, easily takes the crown as the best Duramax engine yet produced.

What problems do the LLY Duramax have?

The most common issues LLY owners encounter include decreased fuel mileage, overheating and poor turbo response. These symptoms result from the inlet mouthpiece of the Garrett turbocharger having to fit into a smaller engine space.

What is wrong with the LLY Duramax?

5. LLY Duramax Overheating. The most notorious problem found on LLY Duramax trucks is that they have a tendency to overheat. Part of this is attributed to their inadequate cooling system, that’s made up of the smallest radiator and fan ever found on a Duramax diesel truck.

What is considered high mileage for a Duramax?

However, as with the Duramax and Cummins engines, between 350,000 and 500,000 miles is usually considered high mileage for a Powerstroke engine. Maintenance of the truck and the engine is the key to getting the most miles.

Can I drive my Duramax with a bad turbo?

The turbo itself is fine, so it’ll still spin and allow air thru, just less of it…..and the vanes aren’t busted, so no worries about running shrapnel thru your motor.

Why do Duramax injectors fail?

One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.

What does p1621 stand for on a Chevy?

P1621 CHEVROLET Meaning 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.

Where does the p1621 code go after power up?

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. Need more information on how to fix the P1621 code?

How much does it cost to repair a p1621 Chevy?

The cost to diagnose the P1621 CHEVROLET code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

What causes DTC p1621 engine light to set?

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. The Powertrain Control Modules ( PCM) Electronically Erasable Programmable Read Only Memory (EEPROM) contains data essential to running the engine and transmission.