P1843
1-2 Shift Solenoid Circuit High Input Voltage
P1843 is an OBD-II diagnostic trouble code meaning: 1-2 Shift Solenoid Circuit High Input Voltage. Common causes: open or short circuit in solenoid circuit, shift solenoid 1-2 malfunction. Estimated repair cost: $17–67.
Symptoms
- Problems with shifting from 1st to 2nd gear
- Jerks when shifting gears
- The gearbox goes into emergency mode
- Check Engine light comes on
- Reduced acceleration dynamics
Causes
- Open or short circuit in solenoid circuit
- Shift Solenoid 1-2 Malfunction
- Problems with the wiring harness or connectors
- Transmission control module (TCM) malfunction
- Corrosion of contacts in an electrical circuit
How to Fix
- Check the continuity of the solenoid circuit
- Check solenoid resistance
- Inspect connectors and wiring harness for damage
- If necessary, replace the 1-2 shift solenoid
- Check TCM operation
Related codes
Error P1843 by Vehicle Brand
FAQ
What does the P1843 code mean?
P1843 is an OBD-II diagnostic trouble code that indicates: 1-2 Shift Solenoid Circuit High Input Voltage
What causes a P1843 error code?
The most common causes of P1843 include: Open or short circuit in solenoid circuit; Shift Solenoid 1-2 Malfunction; Problems with the wiring harness or connectors; Transmission control module (TCM) malfunction.
How do I fix a P1843 diagnostic trouble code?
To fix P1843: Check the continuity of the solenoid circuit. Check solenoid resistance. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1843?
Limited driving only, diagnose soon
How much does it cost to fix P1843?
The estimated repair cost for P1843 is $17–67. Actual cost depends on your vehicle, location, and labor rates.
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