P182C 2018 GMC Sierra Code - Internal Mode Switch 'B' Circuit High 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
- P182C 2018 GMC Sierra indicates Internal Mode Switch 'B' Circuit High 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.
Code P182C 2018 GMC Sierra Description
What are the Possible Causes of the DTC P182C 2018 GMC Sierra?
- 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 P182C 2018 GMC Sierra?
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 P182C 2018 GMC Sierra 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.
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Frequently Asked Questions about P182C 2018 GMC Sierra Code
1. What does the OBDII code P182C mean on a 2018 GMC Sierra?
P182C indicates a problem with the Internal Mode Switch (IMS) 'B' Circuit reporting high voltage, which can affect the transmission's ability to detect shift positions correctly.
2. What are the common symptoms of code P182C on a GMC Sierra?
Common symptoms include the transmission staying in a single gear, inability to shift properly, a check engine light, and erratic or hard shifting.
3. What causes the P182C code to appear?
Causes can include a faulty internal mode switch, damaged wiring or connectors in the IMS circuit, a short circuit, or a malfunctioning transmission control module (TCM).
4. Can I drive my 2018 GMC Sierra with the P182C code?
Driving with this code is not recommended, as it may lead to further transmission issues, reduced performance, and potential safety concerns.
5. How do I diagnose the P182C code on a GMC Sierra?
Diagnosis involves checking the IMS wiring and connectors for damage, testing the internal mode switch for proper function, and using a multimeter to verify circuit voltage levels.
6. How is the P182C code fixed?
Repairs may include replacing the internal mode switch, repairing damaged wiring or connectors, or reprogramming/replacing the TCM if necessary.
7. What tools are needed to troubleshoot the P182C code?
You'll need an OBDII scanner, a multimeter for voltage testing, and possibly a repair manual or wiring diagram specific to the 2018 GMC Sierra.
8. How much does it cost to fix the P182C code on a GMC Sierra?
The cost varies depending on the issue. Replacing an internal mode switch may cost $200-$500, while wiring repairs or TCM replacement could increase the total cost.
9. Can a dirty transmission fluid cause the P182C code?
While dirty transmission fluid is unlikely to directly cause P182C, it can contribute to transmission issues that may trigger related codes or symptoms.
10. Is the P182C code covered under warranty for my 2018 GMC Sierra?
It may be covered if your vehicle is still under the powertrain warranty. Check with your dealership to confirm warranty coverage.
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