OBD-II code · Powertrain (generic)
P0488 EGR Throttle Control Circuit A Range/Performance
EGR throttle A is electrically OK but does not move as commanded. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
Is it safe to drive with P0488?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCarbon buildup
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Throttle A
Related codes
- P0487EGR Throttle Control Circuit A/Open
- P213BEGR Throttle Control Circuit B Range/Performance
- P0485Cooling Fan Power/Ground Circuit
- P0486EGR Sensor B Circuit
- P0489EGR A Control Circuit Low
- P048AExhaust Pressure Control Valve A Stuck Closed
- P048BExhaust Pressure Control Valve A Position Sensor/Switch Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.