OBD-II code · Powertrain (generic)
P04D7 Exhaust Brake Input Circuit Intermittent or Erratic
Same as P04D3 with intermittent or erratic signal. The exhaust control valve modulates exhaust backpressure or routing (EGR feed, sound, regen support); a malfunction shifts torque mapping and may trigger limp mode.
Is it safe to drive with P04D7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent contact at connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.8 h
- Emissions test
- Usually unaffected
- Parts involved
- Exhaust Brake Request Switch, Exhaust Brake Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.