P15B3 on Peugeot: How to Diagnose & Fix
P15B3 — Peugeot-specific definition
1 Peugeot model · 1 documented issue · 1 critical · $300-$6,500 repair
P15B3 on Peugeot by model: symptoms, diagnosis and fix
The 2012–2016 3008 HYbrid4 (2.0 HDi diesel + rear electric motor) suffers hybrid-system faults from two sources: ageing of the Ni-MH high-voltage traction pack under the boot floor, whose poor ventilation accelerates cell imbalance, and an undersized 12V auxiliary battery whose low voltage triggers cascades of spurious fault messages and no-start conditions. Owners report 'Hybrid System Fault' and reduced-power warnings, loss of electric drive (and with it the car's all-wheel-drive capability), and rising fuel consumption when the electric side stops contributing.
Common Symptoms
- 'Hybrid System Fault' or reduced power warning on dash
- Electric drive / EV mode no longer engages
- Noticeably higher fuel consumption
- Car fails to start or shows random multiple warnings
- 4WD mode unavailable (rear axle is electric-only)
How to Fix
Always test and replace the 12V battery first, since many phantom hybrid faults disappear with a healthy auxiliary battery (a trickle charger helps cars used for short trips). Genuine HV pack failures are addressed with refurbished or repaired battery packs from hybrid specialists at a fraction of the new-unit price.
Sources for this issue (7)
- Peugeot 3008 hybrid problem (2013 HYbrid4, hybrid not working) - Peugeot Forumsforum
- 2012 3008 Hybrid recurring engine fault / reduced power - French Car Forumforum
- 3008 Hybrid4 12v Battery Issue - French Car Forumforum
- 3008 Hybrid weird issues fixed - knackered 12V battery - Peugeot Forumsforum
- Most common problems of the Peugeot 3008 Hybrid4 system - Electric Zentrum (battery repair specialist)article
- Peugeot hybrid 3008 electric traction system fault: repair the vehicle! - Peugeot Forumsforum
- Peugeot 3008 Hybrid (2013) fault codes P1A45, U11A0, U13A0 - SpeakEVforum
P15B3 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P15B3 mean on a Peugeot?
On Peugeot, P15B3: Peugeot/PSA: 'Calculated additive level below minimum threshold' (Eolys DPF additive), per frenchcarforum.co.uk/forum/viewtopic.php?p=724599. The shared library name and description already carry this PSA meaning alongside the Honda one. On Peugeot it is documented across 1 model: 3008.
How much does it cost to fix P15B3 on a Peugeot?
Published repair estimates on Peugeot range from $300 to $6,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.