OBD-II code · Powertrain (generic)
P0883 TCM Power Input Signal High
TCM main supply voltage exceeds the operating threshold, typically caused by a faulty voltage regulator on the alternator.
Is it safe to drive with P0883?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAlternator overcharging
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcm, Alternator, Voltage Regulator
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.