P1838 2016 Chevrolet Silverado 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 2016 Chevrolet Silverado 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 2016 Chevrolet Silverado Description
What are the Possible Causes of the DTC P1838 2016 Chevrolet Silverado?
- 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 2016 Chevrolet Silverado?
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 2016 Chevrolet Silverado 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 P1838 2016 Chevrolet Silverado code?
Need more information on how to fix the P1838 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1838 2016 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
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.
Discuss the causes and fixes for P1838 2016 Chevrolet Silverado OBDII Code
Code P1838 2016 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
