P1838
Internal Mode Switch 'A' Circuit High Voltage
P1838 is an OBD-II diagnostic trouble code meaning: Internal Mode Switch 'A' Circuit High Voltage. Common causes: short circuit to power in switch circuit, broken or damaged wiring. Estimated repair cost: $17–67.
Symptoms
- Incorrect display of the current transmission mode on the dashboard
- Gear shifting problems
- Check Engine Light Illuminates
- The transmission may go into emergency mode
- The car may not start in some selector positions
Causes
- Short circuit to power in switch circuit
- Broken or damaged wiring
- Switch contact corrosion
- Malfunction of the internal mode switch
- Transmission control module (TCM) problems
How to Fix
- Check the integrity of the wiring and connectors in the switch circuit
- Measure resistance and voltage at the mode switch
- Check for short circuit to power
- If necessary, replace the mode switch
- Scan the transmission control module for additional errors
Related codes
Error P1838 by Vehicle Brand
FAQ
What does the P1838 code mean?
P1838 is an OBD-II diagnostic trouble code that indicates: Internal Mode Switch 'A' Circuit High Voltage
What causes a P1838 error code?
The most common causes of P1838 include: Short circuit to power in switch circuit; Broken or damaged wiring; Switch contact corrosion; Malfunction of the internal mode switch.
How do I fix a P1838 diagnostic trouble code?
To fix P1838: Check the integrity of the wiring and connectors in the switch circuit. Measure resistance and voltage at the mode switch. Check for short circuit to power. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1838?
Limited driving only, diagnose soon
How much does it cost to fix P1838?
The estimated repair cost for P1838 is $17–67. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat