AutoCodes – Generic – P182A

P182A Code - Internal Mode Switch 'A' 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: P182A indicates Internal Mode Switch 'A' 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 6,367

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 P182A 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 A signal circuit voltage is less than 0.7 V, for 1.75 s.

OBDII Code P182A - Internal Mode Switch 'A' Circuit Low Voltage - AutoCodes.com — P182A Code - Internal Mode Switch 'A' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P182A?

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 P182A?

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 P182A 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 P182A code?

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Information for Specific Makes

P182A Buick — Internal Mode Switch 'A' Circuit Low Voltage
P182A Cadillac — Internal Mode Switch 'A' Circuit Low Voltage
P182A Chevrolet — Internal Mode Switch 'A' Circuit Low Voltage
P182A GMC — Internal Mode Switch 'A' Circuit Low Voltage
P182A Nissan — High-Low Position Sensor

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 P182A Code

What does the OBDII code P182A mean?

The OBDII code P182A indicates that there is a low voltage condition detected in the Internal Mode Switch 'A' circuit, which is part of the transmission control system.

What are the common symptoms of the P182A code?

Common symptoms include transmission issues such as erratic shifting, failure to shift, or the transmission being stuck in a certain gear.

What can cause the P182A code to trigger?

Causes can include a faulty Internal Mode Switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

How can I diagnose the P182A code?

To diagnose the P182A code, check the wiring and connectors for any damage, test the Internal Mode Switch for proper operation, and ensure the transmission control module is functioning correctly.

What repairs are commonly needed for the P182A code?

Repairs may involve replacing the Internal Mode Switch, repairing or replacing damaged wiring, or reprogramming or replacing the transmission control module if necessary.

Can driving with the P182A code cause further damage?

Yes, continuing to drive with this code can lead to further transmission problems, reduced performance, and potential damage to the transmission.

Is it safe to drive a vehicle with a P182A code?

While it may be possible to drive, it is not recommended as it can lead to erratic transmission behavior and potentially unsafe driving conditions.

How can I clear the P182A code after repairs?

You can clear the P182A code using an OBDII scanner after performing the necessary repairs. Alternatively, disconnecting the car battery for a short period may also reset the code.

Will the P182A code cause the check engine light to come on?

Yes, the P182A code will typically trigger the check engine light to alert the driver of an issue with the vehicleâ€™s transmission system.