dominikshadow6
Peugeot Boxer transmission fault
Summary of the thread
A 2011 Peugeot Boxer diesel was experiencing transmission issues, with the transmission indicator and check engine light on, and the vehicle stuck in emergency mode. The problem was suspected to be related to a defective radiator oil pressure reading, possibly due to a faulty wire or connector. After some discussion, it was suggested that the issue might be electrical, potentially involving the radiator fan or pressure sensor. Ultimately, the problem was resolved by replacing a faulty connector on the radiator pressure sensor, restoring normal transmission function.
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4 comment(s)
dominikshadow6 (community.author)
Good shout on the fan! I hadn't thought of that, but wouldn't overheating cause other warning signs too? The temperature gauge seems normal. I'm still leaning towards a bad connection. Where exactly should I be looking for this faulty cable or plug? Any tips for finding a leak?
thomasdragon5
While overheating could show up, the ECU might be reacting to the faulty pressure reading before it gets that far. You're right, it's tough to pinpoint the exact connector without proper diagnostics. A workshop with decent diagnostic gear will be able to pinpoint the cable. It's better to get that sorted quickly to avoid any further damage to your gearbox. The risk here is that a small issue becomes a huge problem very quickly.
dominikshadow6 (community.author)
Cheers! I appreciate the help. It turns out it was just a faulty connector on the radiator pressure sensor, just like I thought! The garage replaced it and cleared the codes, and it's shifting perfectly again. It cost me 95€ Thanks again!
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PEUGEOT
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BOXER
thomasdragon5
Sounds like a potential wiring issue, given the symptoms and the error code. The gearbox going into limp mode and the shifting problems definitely point to something electrical interfering with the transmission control. Have you had a look at the radiator fan operation? If the pressure sensor is faulty, it could cause the fan not to operate correctly, which could lead to overheating. This is more like having a blocked artery than a common cold.