P1390
Timing Belt Skipped One Or More Teeth
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)
Symptoms
- Unstable engine operation
- Power Loss
- Increased fuel consumption
- Difficulty starting the engine
- Check Engine Light
Causes
- Worn or stretched timing belt
- Timing belt tensioner malfunction
- Belt tooth wear
- Incorrect belt installation when replacing
- Oil on the belt
How to Fix
- Check the condition of the timing belt and tensioner
- Replace the timing belt if there are signs of wear.
- Replace tensioner and rollers if necessary
- Check the timing marks match
- If necessary, adjust the valve timing