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DAF fault code P101E: likely components, OEM numbers and symptoms.

BPV actuator cannot reach commanded position in report data. This page groups every component report connected with P101E, 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 P101E.

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

DAF / PACCAR

Back pressure valve report group for MX-11/MX-13 Euro 6 applications. The same OEM number appears in turbo reports too, so this page deliberately exposes the ambiguity and asks users to verify by VIN or photo.

Top symptoms
  • Distinct lack of power under load
  • Severe hesitation during acceleration
  • Engine protection or torque limitation active
OEM numbers
1944459 1959915 3781185 3791936 3791939 3792555 3792559 4031045
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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
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Defect symptoms

Symptoms reported with P101E

Distinct lack of power under load
Severe hesitation during acceleration
Engine protection or torque limitation active
Poor warm-up from cold
Loss of secondary engine braking
Exhaust chuffing or harsh barking when engine brake is used
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
OEM numbers

OEM references to check

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

1944459 1959915 3781185 3791936 3791939 3792555 3792559 4031045 5330077 5355092 2210375 1856755 1856756 2123991 2426244 2256371 2187598 2104977 2128867 2187597 2256380 2426255 2459939 1840165 1840165PE 1840165PEX 713938AT
Why it happens

Likely root causes behind P101E

  • Continuous high-frequency modulation wears the non-replaceable butterfly shaft bearing.
  • Thermal cycling and soot deposits make the butterfly valve bind in the exhaust stream.
  • Smart actuator or electromotor develops internal errors when the flap cannot reach its end stops.
  • E-CAN communication and position tracking faults appear after mechanical jamming.
  • 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.
Fitment

Trucks and engines that report P101E

Model Engine Years
XF 106 MX-11 Euro 6 2013-2023
XF 106 MX-13 Euro 6 2013-2023
CF 480 MX-13 Euro 6 2013-2023
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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