AutoCodes – Generic – B221C

B221C Code - Memory Seat Module Internal

Quick Answer

The Memory System is made up of a Memory Seat Module-Driver (MSMD), Memory Switch, Driver Seat Switch, Adjustable Pedal Switch, and multiple Seat Motors and an Adjustable Pedal Motor. Common causes include Faulty Memory Seat Module-Driver (MSMD), Memory Seat Module-Driver (MSMD) harness is open or shorted, Memory Seat Module-Driver (MSMD) circuit poor electrical connection. 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: B221C indicates Memory Seat Module Internal.
Common causes: Common causes include Faulty Memory Seat Module-Driver (MSMD), Memory Seat Module-Driver (MSMD) harness is open or shorted, Memory Seat Module-Driver (MSMD) circuit poor electrical connection.
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 924

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 Oct 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B221C Description

The Memory System is made up of a Memory Seat Module-Driver (MSMD), Memory Switch, Driver Seat Switch, Adjustable Pedal Switch, and multiple Seat Motors and an Adjustable Pedal Motor. The motors each contain a hall-effect position sensor. The hall-effect position sensor provides feedback to the MSMD in relation to the motors position.
The Driver Seat Switch is a Multiplex (Mux) switch which uses set resistance levels for each switch position. These resistances correspond to different voltages which is monitored by the MSMD over two separate circuits. When a voltage change is detected, the MSMD will command the appropriate Seat motor(s) to move the seat in the requested direction as long as the Driver Seat Switch is held in that direction or its stops have been reached.
The Adjustable Pedal Switch is a three position switch (forward, center, rearward). The MSMD monitors the forward and rearward circuits voltage. If a voltage change is detected, the MSMD will command the Adjustable Pedal motor to move the pedals in the requested direction as long as the Adjustable Pedal Switch is held in that direction or its stops have been reached.
The Memory Switch is a Mux switch that is used to set and recall the seat and pedal positions. When a Memory Switch button is pressed, the Driver Door Module (DDM) detects a voltage change and sends a request over the Controller Area Network (CAN) bus circuit to the MSMD to perform the requested command. If the SET button on the Memory Switch is pressed, followed by the 1 or 2 button, the MSMD will store the seat and pedal positions based on the position inputs received from the hall-effect position sensors. If the 1 or 2 button on the Memory Switch is pressed, the MSMD will recall the stored seat and pedal positions for that particular selection and return the seat and pedals to the stored positions. Memory position may also be recalled using a linked FOBIK transmitter. For driver safety, the MSMD will prevent the memory recall function from being initiated if the transmission gear selector lever is not in the Park position or if the vehicle is moving.

OBDII Code B221C - Memory Seat Module Internal - AutoCodes.com — B221C Code - Memory Seat Module Internal

What does this mean?

What are the Possible Causes of the DTC B221C?

Faulty Memory Seat Module-Driver (MSMD)
Memory Seat Module-Driver (MSMD) harness is open or shorted
Memory Seat Module-Driver (MSMD) circuit poor electrical connection

How to Fix the DTC B221C?

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 B221C 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 B221C code?

Need more information on how to fix the B221C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B221C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B221C Chrysler — Memory Seat Module Internal
B221C Dodge — Memory Seat Module Internal
B221C Jeep — Memory Seat Module Internal
B221C RAM — Memory Seat Module Internal

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 B221C Code

1. What does OBDII code B221C mean?

B221C indicates a fault in the Memory Seat Module's internal components, often related to its ability to store or recall seat position settings.

2. What are the common symptoms of a B221C code?

Symptoms may include memory seat functions not working, inability to save or recall seat positions, or intermittent seat adjustment problems.

3. What causes the B221C code to appear?

The code is typically caused by an internal failure in the Memory Seat Module, electrical issues like short circuits or open wiring, or software corruption.

4. Can the B221C code affect other vehicle systems?

In most cases, this code only affects the memory seat function, but it may occasionally interfere with other comfort-related features.

5. How is the B221C code diagnosed?

A technician will use a diagnostic scanner to confirm the code, check the Memory Seat Module for faults, inspect wiring and connections, and test the module's functionality.

6. Can the B221C code be resolved by resetting the system?

Sometimes, disconnecting and reconnecting the vehicle battery or clearing the code with a scanner may temporarily resolve the issue, but the underlying problem often requires repair.

7. Do I need to replace the Memory Seat Module to fix the B221C code?

If the module has an internal failure, replacement is usually necessary. However, first ensure there are no wiring issues or software updates available.

8. What can cause the Memory Seat Module to fail?

Common causes include exposure to moisture, electrical surges, aging components, or software glitches.

9. How much does it cost to repair a B221C code?

Repair costs vary, but replacing a Memory Seat Module can range from $200 to $600, including parts and labor, depending on the vehicle make and model.

10. Is it safe to drive with a B221C code?

Yes, it is generally safe to drive, but the memory seat functionality will be impaired until the issue is resolved.