OBD-II code · Powertrain (generic)
P081B Starter Disable Circuit High
Starter disable circuit reads stuck high — short to battery voltage. The disable cannot be asserted, weakening the safety chain.
Is it safe to drive with P081B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDisable wire shorted to battery voltage
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Starter Disable Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.