P1838 Chevrolet Code - Internal Mode Switch 'A' 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
- P1838 Chevrolet indicates Internal Mode Switch 'A' 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 P1838 Chevrolet Description
What are the Possible Causes of the DTC P1838 Chevrolet?
- 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 P1838 Chevrolet?
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 P1838 Chevrolet 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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Information for Specific Chevrolet Models
- P1838 2014 Chevrolet Silverado — Internal Mode Switch 'A' Circuit High Voltage
- P1838 2015 Chevrolet Silverado — Internal Mode Switch 'A' Circuit High Voltage
- P1838 2016 Chevrolet Silverado — Internal Mode Switch 'A' Circuit High Voltage
- P1838 2017 Chevrolet Silverado — Internal Mode Switch 'A' Circuit High Voltage
- P1838 2018 Chevrolet Silverado — Internal Mode Switch 'A' Circuit High Voltage
Frequently Asked Questions about P1838 Chevrolet Code
What does the OBDII code P1838 mean for a Chevrolet vehicle?
The P1838 code indicates that there is a high voltage condition detected in the Internal Mode Switch 'A' circuit, which is linked to the transmission control module.
What are the common symptoms of the P1838 code?
Common symptoms include erratic shifting, transmission slipping, illuminated check engine light, or the vehicle may go into limp mode.
What could cause the P1838 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 itself.
How can I diagnose the P1838 code?
Start by using an OBD-II scanner to confirm the code, then inspect the internal mode switch and associated wiring for damage or corrosion. Testing the switch with a multimeter can also help determine if it’s functioning correctly.
What are some common repairs for the P1838 code?
Repairs may involve replacing a faulty internal mode switch, repairing damaged wiring or connectors, or reprogramming or replacing the transmission control module if necessary.
Can I drive my vehicle with the P1838 code?
While it may be possible to drive with the P1838 code, it is not recommended, as it can lead to transmission issues that may worsen over time.
How much does it typically cost to fix the P1838 code?
Repair costs can vary widely, typically ranging from $100 to $600 depending on whether it’s just a switch replacement or involves more extensive repairs like wiring or module replacement.
Will clearing the code resolve the issue?
Clearing the code may temporarily turn off the check engine light, but if the underlying issue is not fixed, the code will likely return.
Is the P1838 code specific to Chevrolet vehicles?
No, while this code is found in Chevrolet vehicles, it can also appear in other makes and models that utilize similar transmission control systems.
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