OBD-II code · Powertrain (generic, extended)
P2B99 Exhaust Pressure Control Valve A Driver Current/Temperature Too High
The output driver for the exhaust pressure control valve A reports current or junction temperature above its protection threshold. Stalled actuator or short-circuit fault.
Is it safe to drive with P2B99?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyValve actuator mechanically jammed
- PossibleControl wire shorted to ground
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Pressure Control Valve A, Ecm
Related codes
- P2B96Injection Pulse Performance
- P2B97Exhaust Pressure Control Valve A Position Exceeded Learning Limit
- P2B98Exhaust Pressure Control Valve A Supply Low
- P2B9AReductant Quality Sensor Circuit Intermittent/Erratic
- P2B9BVehicle Conditions Incorrect for Particulate Matter Sensor Regeneration
- P2B9CCoolant Pump A Stuck/Stalled
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.