OBD-II code · Powertrain (generic, extended)
P2DD5 Fuel Injection Quantity B Lower Than Expected
The measured fuel injection quantity for group B is below the calibrated window. Injector flow drift, rail pressure off, or measurement bias.
Is it safe to drive with P2DD5?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInjectors partially clogged
- PossibleFuel rail pressure low
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Injector Group B, Fuel Rail, Ecm
Related codes
- P026CFuel Injection Quantity A Lower Than Expected
- P2DDCFuel Injection Quantity C Lower Than Expected
- P2DDEFuel Injection Quantity D Lower Than Expected
- P2DD2Control Pilot Charging Switch B Intermittent/Erratic
- P2DD3Control Pilot Charging Switch B Stuck Off
- P2DD4Control Pilot Charging Switch B Stuck On
- P2DD6Fuel Injection Quantity B Higher Than Expected
- P2DD7Cold Start Fuel Injection Quantity B Lower Than Expected
- P2DD8Cold Start Fuel Injection Quantity B Higher Than Expected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.