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| Silver 2000 Volvo S40 Front View |
My 2000 Volvo S40 seems to be
shifting erratically. Sometimes it feels like the car is downshifting
because the car’s RPMs shoot up when I’m trying to accelerate but the
car takes longer than it should to get into the correct gear, sometimes
shudder. This problem also occurs sometimes
after accelerating hard to get onto the highway. At any rate, a local
shop said the car is posting a code in the TCM (transmission control module) 2-3-2 which means speedometer
loss of signal. This is the same with an OBDII reader I used to check
out the car, except that the code reader also spits out another code
P1618 which talks about linkage between the TCM and the ECU. Any help?
The shop basically said the best they could do was replace parts related
to this issue until the problem was resolved, however I don’t have the
money or the time for something like that. Help! Thank you!
Answer: Since it is a loss of signal but it comes
back I would first make sure all the grounds are good. Look close at
where the grounds for the transmission and the instrument cluster and make sure they have good contact.
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