P1701
Transmission Control Module Power Supply
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$1–33 (est.)
Symptoms
- The car goes into emergency gearbox mode
- Inability to change gears
- Check Engine Light Is On
- Loss of engine power
- Unstable automatic transmission operation
Causes
- Blown TCM power circuit fuse
- Wiring harness damage
- Oxidation of module connector contacts
- Power relay fault
- Control module ground problems
How to Fix
- Check and replace TCM power circuit fuses
- Inspect and repair damaged wiring
- Clean the control module connector contacts
- Check the operation of the power relay
- Check the quality of the ground connection