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Code P1ADD

Quick reference

P1ADD at a glance

Plain-language meaning
The car's computer has a memory problem related to the motor that helps the car move. It's like when a video game can't save your progress because the memory card is broken.
Urgency
High – This issue can affect vehicle performance and should be addressed promptly.
Difficulty
Difficult
System
Control Module Error
Tools mentioned
OBD-II Scanner, Multimeter, Soldering Iron (if needed for wiring repair)

This summary uses the existing diagnostic information shown in full below.

Laymans terms

The car's computer has a memory problem related to the motor that helps the car move. It's like when a video game can't save your progress because the memory card is broken.

Explanation

The EEPROM (Electrically Erasable Programmable Read-Only Memory) in the control module for Drive Motor 'B' has encountered an error.

Technical description

This code indicates that there is an error in the EEPROM of the internal control module for Drive Motor 'B'. The EEPROM is a type of memory used to store data that must be saved when power is removed. An error here can affect the motor's operation.

Symptoms

• Check Engine Light is on

• Reduced vehicle performance

• Unusual motor behavior

Common Causes

• Faulty EEPROM in the control module

• Corrupted data in the EEPROM

• Electrical issues affecting the control module

Glossary

EEPROM: Electrically Erasable Programmable Read-Only Memory, a type of memory used in computers and other electronic devices.

Control Module: A device in a vehicle that controls various functions and systems, often referred to as an ECU (Engine Control Unit).

Diagnosis steps

• Use an OBD-II scanner to confirm the code.

• Inspect the wiring and connections to the control module.

• Test the control module for proper operation.

Repair procedures

• Reprogram or replace the control module.

• Repair any damaged wiring or connections.

• Clear the code and test drive the vehicle.

Tools required

• OBD-II Scanner

• Multimeter

• Soldering Iron (if needed for wiring repair)

Estimated repair cost

$300 - $800

Difficulty level

Difficult

Commonly affected vehicles

• Chevrolet Volt

• Toyota Prius

• Nissan Leaf

Preventive measures

• Regularly check and maintain vehicle's electrical systems.

• Avoid exposure of electronic components to extreme temperatures.

• Ensure proper battery maintenance.

Error code type

Control Module Error

User experience recommendations

• Avoid driving the vehicle until repaired to prevent further damage.

• Consult a professional mechanic for accurate diagnosis.

• Regularly update vehicle software if updates are available.

Warranty information

Check with your vehicle's manufacturer for warranty coverage on electronic control modules.

Historical data

This code has been associated with hybrid and electric vehicles due to their reliance on complex electronic control systems.

Urgency level

High – This issue can affect vehicle performance and should be addressed promptly.

Testing conditions

• Vehicle at operating temperature

• Stable electrical supply

Component location

The control module is typically located in the engine compartment or under the dashboard.

FAQs

Q: Can I drive my car with a P1ADD code?
A: It's not recommended as it can lead to further damage and affect vehicle performance.

Q: How do I clear a P1ADD code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is resolved first.

Optional diagnostic gear

Tools that may help diagnose P1ADD

THINKCAR ThinkScan Bidirectional diagnostic tool illustration

High-End · Full-system diagnostics

THINKCAR ThinkScan Bidirectional

A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.

Network faults often require full-system access instead of a generic code reader alone.

View on Amazon
Klein Tools MM325 diagnostic tool illustration

Universal · Digital multimeter

Klein Tools MM325

A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.

Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.

View on Amazon
WORKPRO Wiring Repair Kit diagnostic tool illustration

Universal · Wire connectors and repair kit

WORKPRO Wiring Repair Kit

Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.

Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.

View on Amazon

These are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.

Source: ezOBD2 diagnostic database
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