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Old Sep 20th, 2018, 14:23   #2
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Last Online: Yesterday 21:41
Join Date: Jun 2007
Location: L/H side

Originally Posted by tcpaulh View Post
Volvo S40 SE
1.8 Petrol
Engine designation according to manual B4184S11
Vin YV1MS214252102870

Bought car a couple of years ago and started getting "reduced engine performance" on dash readout. Garage determined throttle position sensor faulty and replaced pedal+sensor

Car uses 1/2 a litre of oil per tank of petrol. Drives well 35mpg.

Last week I was on a 200 mile run and stopped off for a break. Reduced engine performance dash warning had been showing for months but I couldnt afford to have it looked at or was ignoring the problem...
Car refused to start. No life from engine and a bunch of dash warnings as attached

Recovery service called out who couldnt start it at first but then after a failed bump start (no engine activity) the car came to rest and after that it started as normal.

Took to garage and they found:

Error Codes
2138 - accelerator pedal position sensor faulty signal
2121 accelerator pedal faulty circuit *
D900 Configuration fault. Software faulty
C168 Intermittent fault. Commmunication brake control module (BCM) signal too low
C400 Control modulle communication ; faulty signal
C167 Intermittent fault. Communication central electronic module (CEM) signal too low.

*Cleared all codes and 2121 returned. Pedal+postion sensor replaced (for the second time)

Paid for work. Started car and "reduced engine performance" on dash. Turned off engine, spoke to mechanic as still at garage. He turned ignition on and error no longer displayed so drove home keeping fingers crossed.

Car parked up for 3 days then today I went to start it and got a bunch of errors on dash readout. Same as before. No life from engine. Lights come on etc as normal.


Whats wrong?

Have I got any reasonable comeback with the garage?

If you had taken it to the experts , a volvo garage they would have known straight away what to do due to their experience , The pedal sensor is never at fault ,
The problem is very likely to be the 3 pairs of network wires when they go into the CEM through the plugs . Volvo do repair terminals , you would need 6 replacing . also wise to renew the data wire from pedal to CEM . changing the terminals on the pedal plug would be an insurance policy too .
My comments are only based on my opinions and vast experience .
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