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DAF fault code P0027: likely components, OEM numbers and symptoms.

Exhaust valve / back pressure control range issue. This page groups every component report connected with P0027, so a mechanic can move from the error code to the relevant OEM numbers, defect symptoms and fitment checks.

A fault code alone is not a parts order. Confirm with live data, VIN, installed OEM number, connector and part photos before quoting or fitting.

Likely components

Component families linked with P0027.

The same code can appear with different root causes. Use the OEM number and symptom pattern to choose the right branch.

Back pressure valve

2104977 · BPV valve 2104977

DAF

MX-13 Euro 6 BPV valve group from the repeated reports. Searchers usually need to match an OE number and understand weak engine-brake, chuffing exhaust and derate symptoms.

Top symptoms
  • Engine brake suddenly weak or completely dead on descents
  • Slow turbo spool and flat take-off after throttle lift
  • Harsh barking or chuffing from the exhaust when braking with engine brake
OEM numbers
2104977 2128867 2187597 2256380 2426255 2459939
View full diagnostic page →
Defect symptoms

Symptoms reported with P0027

Engine brake suddenly weak or completely dead on descents
Slow turbo spool and flat take-off after throttle lift
Harsh barking or chuffing from the exhaust when braking with engine brake
Intermittent derate with heavy trailer and warm engine
Fuel economy worsens on stop-start or hilly routes
Loss of pull with a trailer on rolling roads
Whistling or hissing around the hot side under engine braking
Rough idle or occasional stall after throttle lift
Extra exhaust smoke when the flap hangs partly shut
Poor fuel economy and weak engine brake on long descents
OEM numbers

OEM references to check

Use these links when the workshop note only contains an OE number instead of the exact part family.

2104977 2128867 2187597 2256380 2426255 2459939 1840165 1840165PE 1840165PEX 713938AT
Why it happens

Likely root causes behind P0027

  • Butterfly shaft carbon-binds in the exhaust stream.
  • Actuator gearbox strips or develops position-sensor drift.
  • Exhaust-pressure control becomes erratic once the flap starts sticking.
  • Thermal cycling creates intermittent faults when the valve is hot.
  • Exhaust carbon packs around the flap and worn shaft.
  • Heat-damaged actuator internals stop commanded position tracking.
  • Exhaust pressure leaks across worn parts and the engine brake loses force.
Fitment

Trucks and engines that report P0027

Model Engine Years
XF 106 MX-13 Euro 6 2013-2023
XF 105 MX-13 Euro 5 2010-2013
CF 85 MX-13 Euro 5 2010-2013

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