Question about 2002 Audi A4

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What is a limp mode

Lost power,has low revs

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Limp mode is when the ECM reduces power in the engine to prevent damage to the engine and gear box. It allows you to get the car to a position of safety to check items like oil and coolant levels and temperature .Run fault codes to find the cause of the limp mode

Posted on Mar 26, 2014

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Posted on Jan 02, 2017

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2004 gmc envoy went into limp mode and has no codes, any idea why


limp mode is a situation initiated by the ECM to protect the engine and/or the transmission
the problem is in the transmission and the TCM has lost continuity so at 2nd ratio it is shutting down the transmission so that more than 1 ratio cannot be selected together or the engine rpms can not go so high as to blow a motor
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What is the meaning of limp home mode


It means the computer noticed something wrong or lost contact with an important sensor that could ruin the engine or transmission and has de-rated the power so you can get home without the car stopping or damaging itself. Limp Home Mode or Limp-in is an operating condition set by the vehicle computer.

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https://www.quora.com/What-is-limp-home-mode-in-a-car What is the meaning of limp home mode Google Search

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Nissan primera 2005 1.8 sx goes limp mode at night with lights and wipers on. No measurable battery or charger problems. Switch off lights and the problem goes away instantly.


The only thing these components have in common is the ground wires. There are many grounds on a vehicle. But the main three are the battery to body, battery to engine and engine to body. These are fairly large wires/cables. They should be checked with an ohm meter. I replace or repair any wires that have more than 5.0 ohms of resistance.

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Sounds like your vehicle is in limp mode. Check for faults with a fault code scanner at a local auto parts store. Resetting the fault will fix the limp mode, but not whatever caused your vehicle to initiate limp mode.

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One of the accelerator position sensors may be bad putting it into limp home mode . Have it scanned for codes and post them here .

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When were the fuel filters changed.sounds like you have water in the fuel.Drain the tank and try new fuel after changing fuel filter.If it was in limp mode you would not get the revs droping down then smoke then picking up.Limp mode only alows you to do about 40mph.

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It sounds like your transmission is going into the limp mode. The transmission goes into limp mode to protect the transmission from major damage. You either need to take it to the dealer or to a transmission shop to have a diagnostic test done.

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