Skip the auto shop - Our mechanics make house calls

Q: Car in "limp-mode" - 2004 Mercedes-Benz Sprinter 2500

asked by on

I have 311,500 miles on my van with some electrical problems. My battery light has been coming on from 2 to 6 seconds at a time and then back off again. I am using a second alternator now. But this problem isn’t the same as the last one. Now my radio will stop for just a split second and come back on. Then sometimes it flat lines – every light on the dashboard will come on then it will go into limp mode. This has been happening for a few years now and getting worse. I can fix this by turning off the engine and waiting for the click from the dashboard and then restarting it. Then it runs perfectly. Well I can’t do this anymore. Now I just put it in neutral and restart it after the click. I don’t have this problem at all when idling the car. It only happens while driving. Do you know what’s wrong with my van?

A: The boost pressure, and the intake charge t...

The boost pressure, and the intake charge temperature sensor in the turbo boost circuit are thought to be the most common origins of "limp mode" problems. The connectors on these 2 sensors become slightly corroded with time, miles and weather conditions, and gradually miscommunicate to the engine control unit - causing limp mode behavior as you note. A professional diesel mechanic can diagnose this problem, and make needed repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Oil light on and off.

Hi There! This light will usually come on when one of two things are happening. Either the motor is in fact low on oil or the oil pressure sending unit is not working properly and may be producing a faulty...

Q: Air conditioner not working

Hello! With the AC not working on this new of a vehicle, it is a little unusual. The most common causes of the AC not working are low refrigerant or an electrical issue. A qualified Mechanic, such as one from...

Q: Instrument cluster is off with a P0600 reading

Hello there, the P0600 code is not one that is normally seen on your 2003 Mercedes ML350. The P0600 code tells us there is a communication link issue with the ECU. This may have been caused by the fuel pump...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.