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Code P1C42

Quick reference

P1C42 at a glance

Plain-language meaning
This code means there's a problem with the part of the car that helps charge the battery. It's like when your phone charger doesn't work right.
Urgency
High – Charging system issues can lead to battery failure and reduced vehicle performance.
Difficulty
Moderate
System
Charging System Issue
Tools mentioned
OBD-II scanner, Multimeter, Basic hand tools

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

Laymans terms

This code means there's a problem with the part of the car that helps charge the battery. It's like when your phone charger doesn't work right.

Explanation

The P1C42 code indicates an issue with the hardware of the Universal Charger Extension Control Module, which is responsible for managing the charging process of the vehicle's battery.

Technical description

The Universal Charger Extension Control Module is an integral part of the vehicle's charging system, especially in hybrid or electric vehicles. A hardware error in this module can affect the vehicle's ability to properly charge the battery, leading to potential performance issues.

Symptoms

• Charging system warning light on

• Battery not charging properly

• Reduced vehicle performance

Common Causes

• Faulty Universal Charger Extension Control Module

• Wiring issues or poor connections

• Software glitches or updates needed

Glossary

OBD-II: On-Board Diagnostics, a standardized system for self-diagnostics in vehicles.

Module: A component or part of a vehicle's electronic system.

Diagnosis steps

• Check for any loose or damaged wiring connections to the module.

• Perform a diagnostic scan to confirm the code and check for other related codes.

• Inspect the Universal Charger Extension Control Module for physical damage.

Repair procedures

• Secure or replace any loose or damaged wiring connections.

• Update the vehicle's software if a glitch is suspected.

• Replace the Universal Charger Extension Control Module if faulty.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$200 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Volt

• Nissan Leaf

• Toyota Prius

Preventive measures

• Regularly inspect and maintain charging system components.

• Ensure software is up to date.

• Avoid overloading the charging system.

Error code type

Charging System Issue

User experience recommendations

• Avoid using the vehicle until the issue is resolved to prevent battery damage.

• Consult a professional mechanic for a thorough inspection.

Warranty information

Check with the vehicle manufacturer as charging system components may be covered under warranty.

Historical data

This code has been more prevalent with the increase in hybrid and electric vehicles, highlighting the importance of reliable charging systems.

Urgency level

High – Charging system issues can lead to battery failure and reduced vehicle performance.

Testing conditions

• Vehicle in a safe, stationary position

• Access to a reliable power source for charging

Component location

The Universal Charger Extension Control Module is typically located near the vehicle's battery or charging port.

FAQs

Q: Can I drive my car with this code?
A: It's not recommended as it could lead to battery issues or vehicle breakdown.

Q: How do I know if the module is faulty?
A: A professional diagnostic scan and inspection are needed to confirm module failure.

Optional diagnostic gear

Tools that may help diagnose P1C42

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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