AutoCodes – Generic – P1824

P1824 Code - Internal Mode Switch 'P' Circuit Low Voltage

Quick Answer

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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: P1824 indicates Internal Mode Switch 'P' Circuit Low Voltage.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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 25,330

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1824 Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70-0.96 V indicating On or 1.68-2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch P signal circuit voltage is less than 0.7 V, for 1.75 s.

OBDII Code P1824 - Internal Mode Switch 'P' Circuit Low Voltage - AutoCodes.com — P1824 Code - Internal Mode Switch 'P' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1824?

Faulty Transmission Internal Mode Switch
Transmission Internal Mode Switch harness is open or shorted
Transmission Internal Mode Switch circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P1824?

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 P1824 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 P1824 code?

Need more information on how to fix the P1824 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1824 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1824 Buick — Internal Mode Switch 'P' Circuit Low Voltage
P1824 Cadillac — Internal Mode Switch 'P' Circuit Low Voltage
P1824 Chevrolet — Internal Mode Switch 'P' Circuit Low Voltage
P1824 Ford — Transmission 4-Wheel Drive Clutch Relay Circuit Failure
P1824 GMC — Internal Mode Switch 'P' Circuit Low Voltage
P1824 Infiniti — Transfer Motor
P1824 Lincoln — Transmission 4-Wheel Drive Clutch Relay Circuit Failure
P1824 Mercury — Transmission 4-Wheel Drive Clutch Relay Circuit Failure
P1824 Mitsubishi — Shift Fork Position Sensor 1 System Poor Performance
P1824 Nissan — Transfer Motor

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 P1824 Code

1. What are the common symptoms of OBDII code P1824 (Internal Mode Switch 'P' Circuit Low Voltage)?

The common symptoms of code P1824 may include issues with shifting gears, the transmission staying in one gear, and the vehicle may not start.

2. What are the possible causes of OBDII code P1824?

Possible causes of code P1824 include a faulty internal mode switch, damaged wiring or connectors in the circuit, low voltage in the circuit, or a malfunctioning transmission control module.

3. How is OBDII code P1824 diagnosed?

Diagnosing code P1824 typically involves using a diagnostic scanner to retrieve the code, checking the internal mode switch, inspecting the wiring and connectors for any damage, and testing the voltage in the circuit.

4. Can I drive my vehicle with OBDII code P1824?

It is not recommended to drive your vehicle with OBDII code P1824, as it can lead to transmission issues and potentially cause further damage. It is best to address the issue promptly.

5. How can OBDII code P1824 be repaired?

Repairing OBDII code P1824 may involve replacing the internal mode switch, repairing any damaged wiring or connectors, checking and correcting the voltage in the circuit, or replacing the transmission control module if necessary.

6. Can a DIY enthusiast fix OBDII code P1824 at home?

While some DIY enthusiasts may be able to address OBDII code P1824 at home by replacing the internal mode switch or checking for damaged wiring, it is recommended to consult a professional mechanic for an accurate diagnosis and repair.

7. Is OBDII code P1824 a serious issue?

OBDII code P1824 can be a serious issue as it can affect the transmission's performance and lead to drivability problems. Ignoring this code may result in further damage to the vehicle.

8. How much does it typically cost to repair OBDII code P1824?

The cost of repairing OBDII code P1824 can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor rates. It is advisable to obtain quotes from different repair shops.

9. How long does it take to repair OBDII code P1824?

The time it takes to repair OBDII code P1824 can vary based on the complexity of the issue and the availability of parts. Simple fixes like replacing the internal mode switch may take a few hours, while more extensive repairs could take longer.

10. Can OBDII code P1824 reoccur after being repaired?

OBDII code P1824 can reoccur if the underlying issue is not properly addressed during the repair process. It is crucial to ensure that all necessary repairs are completed to prevent the code from coming back.