P1838 2016 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage
Quick Answer
The P1838 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates an issue with the Internal Mode Switch 'A' Circuit High Voltage. Common causes include Faulty internal mode switch, Damaged wiring or connectors in the circuit, Malfunctioning transmission control module (TCM). 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 2016 Chevrolet Silverado indicates Internal Mode Switch 'A' Circuit High Voltage.
- Common causes
- Common causes include Faulty internal mode switch, Damaged wiring or connectors in the circuit, Malfunctioning transmission control module (TCM).
- 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 2016 Chevrolet Silverado Description
The P1838 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates an issue with the Internal Mode Switch 'A' Circuit High Voltage. The internal mode switch (IMS) is a component in the transmission that helps the vehicle's computer system determine the current gear selection and transmission mode. When the IMS 'A' circuit detects a high voltage signal that is outside of the normal operating range, it triggers the P1838 code.
Common Causes of P1838 2016 Chevrolet Silverado
- Faulty internal mode switch
- Damaged wiring or connectors in the circuit
- Malfunctioning transmission control module (TCM)
- Issues with the vehicle's battery or electrical system
Symptoms of P1838 2016 Chevrolet Silverado
- Erratic or harsh shifting
- Delayed engagement when shifting gears
- Transmission getting stuck in a single gear
- Reduced fuel efficiency
- Rough idling or stalling
How to Fix P1838 2016 Chevrolet Silverado
- Begin by conducting a thorough diagnostic scan to confirm the P1838 code and identify the specific cause of the issue.
- Inspect the internal mode switch and its wiring for any signs of damage or corrosion. Replace the internal mode switch if necessary.
- Check the connectors in the circuit for proper connection and continuity. Repair or replace any damaged connectors.
- Test the transmission control module (TCM) for proper functionality. Replace the TCM if it is found to be faulty.
- Clear the DTC and perform a test drive to ensure that the issue has been resolved.
Cost to Fix P1838 2016 Chevrolet Silverado
The typical repair costs for addressing the P1838 code on a 2016 Chevrolet Silverado can range from $200 to $500, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It is advisable to check local rates for a more accurate estimate.
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Frequently Asked Questions about P1838 2016 Chevrolet Silverado Code
What does the OBDII code P1838 mean on a 2016 Chevrolet Silverado?
P1838 indicates an issue with the Internal Mode Switch 'A' Circuit, specifically a high voltage condition detected by the transmission control module (TCM).
What are the common symptoms of the P1838 code?
Symptoms may include the transmission stuck in a single gear, erratic shifting, an illuminated check engine light, or the vehicle going into limp mode.
What causes the P1838 code to appear?
Common causes include a faulty internal mode switch, damaged wiring or connectors in the circuit, corrosion, or a malfunctioning transmission control module (TCM).
How is the P1838 code diagnosed?
Technicians typically inspect the wiring and connectors for damage, test the internal mode switch for proper function, and use a scan tool to monitor the switch’s voltage readings.
Can I drive my Silverado with the P1838 code?
Driving with this code is not recommended, as it can cause transmission issues like limp mode or erratic shifting, potentially leading to further damage.
How do I fix the P1838 code on my Silverado?
Repairs may involve replacing the internal mode switch, repairing or replacing damaged wiring, cleaning corroded connectors, or, in rare cases, replacing the TCM.
Is the P1838 code related to the transmission?
Yes, the P1838 code is directly related to the transmission, as it involves the internal mode switch, which communicates gear position to the TCM.
How much does it cost to fix the P1838 code?
Repair costs vary but typically range from $100 to $500, depending on whether the issue is with wiring, connectors, or the internal mode switch itself.
Can a weak battery cause the P1838 code?
While unlikely, a weak or failing battery can sometimes cause electrical issues that might contribute to this code, so it’s worth checking the battery’s condition.
Do I need to reprogram the TCM after fixing the P1838 code?
Reprogramming the TCM is usually not required unless the TCM itself is replaced, but clearing the code and performing a test drive to confirm the repair is essential.
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