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Discussion Starter · #1 ·
Over the last few years, my Nissan Xtrail T31 loses power (no acceleration) on some occassions whilst slowing down or stopping at stop signs, traffic lights, roundabouts, road humps etc. Sometimes I lose power for just a second and other times up to 10 seconds. If I switch off and turn back on the vehicle, the problem goes away. What is the probable cause of this? Is this a common issue?
 

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A common problem with random engine shutdowns, difficult startups, rough running is a marginal camshaft position sensor or a marginal crankshaft position sensor. Most of the time when this happens, the "check engine light" never comes on; subsequently when performing an ECU code readout, there was no fault code set. There's been many members here on the forum that have had problems similar to yours and the fix was replacing those two sensors.

The best and cheapest fix for this situation is to replace both sensors at the same time; the reason for doing this is there is no way to determine which sensor is at fault with this type of condition. You can take your vehicle to a dealer/repair shop and they'll tell you there is nothing wrong after they go through with diagnostic tests because at that time the vehicle was running OK.

When replacing the sensors, always use Nissan OEM parts from a Nissan dealer; aftermarket electronic items generally are not reliable, don't last long, and many times are DOA. Inspect the harness connectors at both sensors for any oxidation or loose connections. Insure that any water resistant connector is in good condition; if the seals have been compromised, then any water intrusion can cause intermittent problems.
 

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Thank you for your detailed explanation. I took my vehicle to a technician recently. He stated that he is 85% sure that the problem is being caused by the transmission computer. What are your thoughts on this?
 

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Thank you for your detailed explanation. I took my vehicle to a technician recently. He stated that he is 85% sure that the problem is being caused by the transmission computer. What are your thoughts on this?
Replacing the TCM is an expensive guess, while replacing the cam/crank sensors is a much less expensive guess. I would go with replacing cam/crank sensors which is something you can do yourself.
 
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