P1838 Chevrolet Code - Internal Mode Switch 'A' Circuit High Voltage
Quick Answer
The P1838 Chevrolet code indicates that there is a problem with the Internal Mode Switch 'A' Circuit High Voltage. Common causes include Wiring issues or shorts in the internal mode switch circuit, Faulty internal mode switch, Malfunctioning transmission control module. 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 Wiring issues or shorts in the internal mode switch circuit, Faulty internal mode switch, Malfunctioning transmission control module.
- 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 P1838 Chevrolet Description
The P1838 Chevrolet code indicates that there is a problem with the Internal Mode Switch 'A' Circuit High Voltage. This means that the vehicle's onboard computer has detected a high voltage signal from the internal mode switch, which is responsible for determining the transmission gear position. The internal mode switch is a critical component that helps the transmission system operate smoothly by providing accurate information about the gear selection.
Common Causes of P1838 Chevrolet
- Wiring issues or shorts in the internal mode switch circuit
- Faulty internal mode switch
- Malfunctioning transmission control module
- Failing transmission solenoid
- Damaged transmission sensor
Symptoms of P1838 Chevrolet
- Erratic shifting or difficulty shifting gears
- Transmission slipping or hesitation
- Check Engine Light illuminated
- Loss of power or acceleration
- Vehicle stuck in a single gear
How to Fix P1838 Chevrolet
- Begin by diagnosing the specific cause of the high voltage signal, using a diagnostic scanner to retrieve the fault codes and pinpoint the issue.
- Inspect the internal mode switch and its wiring for any signs of damage or corrosion. Replace any damaged components.
- Test the transmission control module to ensure it is functioning properly. Replace if necessary.
- Check the transmission solenoids and sensors for any faults and replace as needed.
- Clear the fault codes and reset the system to see if the issue has been resolved. Test drive the vehicle to ensure the transmission is shifting correctly.
Cost to Fix P1838 Chevrolet
The cost of repairing a P1838 Chevrolet code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the parts required for this repair may cost anywhere from $100 to $400, while labor costs can range from $100 to $300. Overall, the total cost of addressing this issue may fall between $200 and $700. It's important to keep in mind that these are rough estimates, and actual costs may vary based on factors like location, vehicle make and model, and the shop's labor rates. It's recommended to obtain quotes from local auto repair shops for a more accurate cost estimate.
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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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