P1657
1-4 Upshift Solenoid Control Circuit
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Incorrect gear shifting (skipping 2nd and 3rd gears)
- Hard gear shifts
- Switching to emergency mode of automatic transmission operation
- Check Engine Light Illuminates
- Reduced acceleration dynamics
Causes
- Open or short circuit in solenoid circuit
- Shift Solenoid 1-4 Malfunction
- Poor contact in solenoid connector
- Wiring harness damage
- Transmission control module (TCM) malfunction
How to Fix
- Check the integrity of the solenoid control circuit
- Check the solenoid resistance (compare with the norm)
- Inspect connectors and contacts for corrosion
- Replace shift solenoid 1-4 if necessary
- Check the operation of the TCM (diagnostic scanner)