P1842
1-2 Shift Solenoid Circuit Low Input Voltage
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Incorrect gear shifting
- Delays when switching from 1st to 2nd gear
- Power dips during acceleration
- Increased fuel consumption
- Check Engine light comes on
Causes
- Shift Solenoid 1-2 Malfunction
- Open or short circuit in the circuit
- Bad contacts in connectors
- Transmission control module (TCM) malfunction
- Problems with power or grounding of the circuit
How to Fix
- Check the integrity of wiring and connectors
- Check solenoid resistance
- Check voltage in solenoid circuit
- Replace faulty solenoid if necessary
- Check and, if necessary, replace the transmission control unit