FAQ
TL;DR: P15BE on Boxer/Jumper often traces to a blown or starved 20A feed; "Check fuse no. 5, maxi 20A." Fix the under‑hood fuse/relay, vaporizer glow plug, or harness to restore DPF regen. [Elektroda, przemas7, post #17763240]
Why it matters: For Peugeot Boxer and Citroën Jumper 2.2 HDI owners, this FAQ shows how to diagnose and fix P15BE fast, without guesswork.
Quick Facts
- Primary protection: Maxi Fuse No. 5, 20A, in the fuse box. Start diagnostics here. [Elektroda, przemas7, post #17763240]
- The fuel vaporizer/dispenser sits just ahead of the DPF; best accessed from underneath. [Elektroda, decybel91, post #18037493]
- Relay and fuse often live in a small add‑on inside the under‑hood box (one red relay + one fuse). [Elektroda, decybel91, post #18037250]
- Shorted, rusted vaporizer glow plug can blow the “middle of three” fuses; new unit cost ~PLN 850; regen resumed after replacement. [Elektroda, slawarek, post #18039795]
- Severe overheating can melt the harness under the fuse box and pop several fuses; repair wiring before further tests. [Elektroda, allanmorrison, post #21434941]
What does P15BE mean and what symptoms should I expect?
P15BE flags a fault driving the DPF vaporizer glow plug. The ECU commands current but sees no response. The engine can enter emergency mode and lose power. Users reported no current reaching the plug despite new fuse, relay, and injector. Focus checks on restoring that power feed. [Elektroda, EMOZ, post #21172275]
Which fuse should I check first for P15BE?
Check Maxi Fuse No. 5, rated 20A, in the fuse box. Replace if blown and retest the circuit. Many fixes start here and end unnecessary parts swapping. Label the fuse after verification for future reference. [Elektroda, przemas7, post #17763240]
Where is the vaporizer fuse and relay located?
Look for a small additional box inside the under‑hood fuse box. It typically holds one red relay and one fuse. Remove the cover and inspect both for heat signs. “Small additional box in the box under the hood, one red relay and one fuse.” [Elektroda, decybel91, post #18037250]
Where is the DPF fuel dispenser/vaporizer on the vehicle?
Access it from underneath, right in front of the DPF. Safely raise the vehicle and locate the unit ahead of the particulate filter. The glow‑plug connector is at that assembly. Clean access improves diagnosis and replacement time. [Elektroda, decybel91, post #18037493]
How do I quickly confirm a shorted vaporizer glow plug?
Use this 3‑step check:
- Unplug the glow‑plug connector at the vaporizer.
- Connect an H7 bulb in its place as a test load.
- Run the relay actuator test; if the bulb flashes and the fuse holds, the original plug is shorted. One rust‑shorted plug blew the fuse during test and needed replacement. [Elektroda, slawarek, post #18039795]
What resistance should the vaporizer glow plug show?
Approx. 1.2 Ω was measured on a unit considered OK. This low resistance indicates a high‑current heater element. Measure across the plug pins with the connector off. Compare similar readings before condemning the plug. [Elektroda, thesperado, post #17754207]
My scan tool toggles the relay, but the relay output has no 12V. Why?
One working contact goes to the plug; the other should have fused 12V. If that feed is missing, suspect an internal BSM/BSI path or a break between fuse and relay. The module detects missing components; a missing relay coil can set P15BB. [Elektroda, thesperado, post #17764652]
Can a clogged dispenser trigger P15BE, and how should I clean it?
Yes, a blocked dispenser can restrict dosing and fault the system. If the relay and fuse check out, remove the dispenser and wash it thoroughly. Ensure fuel flows freely before refitting. “The fuel must flow freely through it.” [Elektroda, decybel91, post #18037250]
My 20A fuse keeps blowing. Could the glow plug be the cause?
Yes. A corroded glow plug can short and pop the supply fuse during tests. Substituting a bulb confirmed the circuit; replacing the glow‑plug assembly fixed it. After replacement, the system initiated automatic firing for regeneration. [Elektroda, slawarek, post #18039795]
The harness under my fuse box is melted and multiple fuses pop. What now?
This indicates severe overheating on the vaporizer glow‑plug feed. One owner reported thin gauge wiring, melted insulation, and several fuses then blowing. Replace or repair the damaged wiring first. Recheck vaporizer current draw after wiring restoration. [Elektroda, allanmorrison, post #21434941]
I see P15BE-73 and P1490-92 together. Are these related to the same system?
Owners have reported P15BE‑73 together with P1490‑92 while working on the DPF fuel dosing/vaporizer circuit. Treat these as variants tied to the same subsystem. Prioritize fuse, relay, dispenser, and wiring checks. [Elektroda, slawarek, post #18012432]
Will replacing the vaporizer “candle” fix P15BE, and what’s the cost?
Replacement solved the fault for one owner and regeneration started automatically. The new assembly cost about PLN 850. Confirm the 20A fuse holds and the actuator test passes after installation. Clear codes, then monitor regeneration status. [Elektroda, slawarek, post #18039795]
Warm engine loses power with P15BE, but unplugging the temperature sensor restores power. Why?
One report noted no current at the vaporizer plug, plus power loss when hot. Disconnecting the temperature sensor temporarily restored power. This points toward the ECU limiting output under a detected drive fault. Restore current to the vaporizer circuit to proceed. [Elektroda, Kubi491, post #20172555]
I only see a single relay, and disconnecting it stops the car from starting. How do I verify its function?
Bridge that relay to see which system energizes. This confirms whether it is the main relay or the DPF vaporizer relay. Identify its load before further changes to avoid misdiagnosis. [Elektroda, decybel91, post #19007788]
Can P15BE be solved by replacing just a blown 20A fuse?
Yes. One owner replaced the under‑hood 20A fuse, cleared the code, and everything worked. Verify the root cause to prevent a repeat failure. Monitor after a few drive cycles. [Elektroda, piotrekmaciaszek12, post #20359477]
