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Renault Master Diesel Starting and Transmission Issues

I own a 2015 Renault Master with a Diesel engine and 135,000 km on it. I'm experiencing a couple of issues: the engine is hard to start, and the automatic transmission does not shift as usual. Initially, I replaced the glow plugs and the vehicle ran well for two weeks before the problem reoccurred. I then replaced the glow plug module, which also worked for two weeks before the starting issue returned. If I pump the diesel bleeder pump, I can start the engine. There are no injection fault codes anymore, but sometimes the automatic transmission won't engage, and the EPS light comes on. The current fault codes are brake 5050 & 50ce and trans 720 output speed. Could anyone provide insights or solutions to these problems?

Summary of the thread

A 2015 Renault Master Diesel is experiencing hard starting and automatic transmission issues. The starting problem temporarily improved after replacing glow plugs and the glow plug module, but returned, suggesting a possible air leak in the fuel system. Pumping the diesel bleeder pump allows the engine to start, indicating a potential issue with fuel delivery. The transmission problem, accompanied by an EPS light and fault codes, may be related to low or dirty transmission fluid or a faulty brake light switch affecting both systems. Checking for air leaks, inspecting the fuel system, and ensuring proper transmission fluid levels are recommended solutions.

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1 comment(s)

CarlyMechanic

Start by checking the fuel system for any air leaks, as air in the system can cause hard starting issues. Inspect the fuel lines, connections, and the fuel filter for any signs of leaks or damage. Ensure the fuel filter is clean and properly installed. For the transmission issue, check the transmission fluid level and condition, as low or dirty fluid can affect shifting. If the EPS light is on, inspect the brake system, especially the brake light switch, as it can affect both the EPS and transmission. Let me know how these checks go or if you have further questions.

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RENAULT

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MASTER