Electrics: - Is the CEM on my XC90 dying/dead?

Parknest · Oct 16th, 2022, 12:20

I think I'm having this problem with my XC90.

After driving for a certain length of time (more than 2 hours, I think). I would hear a thump from the transmission, what sounds like some relays clicking, a loss of power to the radio/CD, indicators, wipers and the instrument panel. The climate control would still be working, the headlights would still be working and it would drive fine but if I stopped and tried to set off again it would respond very slowly as if it was trying to set off in a higher gear. Before losing the instrument panel, I would get "Brake failure Stop safely" and SRS messages on the display. This has been going on sporadically during the time I've had my XC90. It happened yesterday after a run out to Burnley and Oldham. I was able to get home and I scanned it with my scantool and these are the fault codes that came up.

Diesel Engine
ECM-A03B Communications, Central Electronic Module. Faulty Signal
ECM-A500 Control Area Network (CAN) Fault. Faulty Signal
ECM-9210 Cruise Control. Faulty Signal

SRS
SRS-00D5 SRS Indicator Lamp. Signal Missing

REM
REM-9F21 Cargo Compartment Lighting. Faulty Signal.

CCM
CCM-0021 AirQuality Sensor. Internal Fault.

ABS
ABS-0094 Communication Between Control modules. Communication Problems With Active On Demand Coupling.

CEM
CEM-1A64 Communication With AOC Control Module Signal Missing.
CEM-1D07 Control Module Internal Fault.

CCM-0021, ABS-0094 & CEM-1A64 were already there and the last 2 relate to a faulty DEM so they can be eliminated for now.

2 of those fault codes ECM-A03B & CEM-1D07 seem to point to a faulty CEM.

I came out to it today when it was stone cold and it has got worse. The remote wasn't working even with a new battery. I unlocked it with the key, turned the ignition and within a few seconds I would get the same power loss as before but I could start the engine and it would struggle to set off. I'm now unable to scan for any fault codes. I'm now suspecting the CEM has finally given up the ghost.

Can anyone shed any light on this?

Oct 16th, 2022, 12:20	#1
Parknest Junior Member Last Online: Feb 12th, 2024 00:35 Join Date: Mar 2022 Location: Halifax	Is the CEM on my XC90 dying/dead? I think I'm having this problem with my XC90. After driving for a certain length of time (more than 2 hours, I think). I would hear a thump from the transmission, what sounds like some relays clicking, a loss of power to the radio/CD, indicators, wipers and the instrument panel. The climate control would still be working, the headlights would still be working and it would drive fine but if I stopped and tried to set off again it would respond very slowly as if it was trying to set off in a higher gear. Before losing the instrument panel, I would get "Brake failure Stop safely" and SRS messages on the display. This has been going on sporadically during the time I've had my XC90. It happened yesterday after a run out to Burnley and Oldham. I was able to get home and I scanned it with my scantool and these are the fault codes that came up. Diesel Engine ECM-A03B Communications, Central Electronic Module. Faulty Signal ECM-A500 Control Area Network (CAN) Fault. Faulty Signal ECM-9210 Cruise Control. Faulty Signal SRS SRS-00D5 SRS Indicator Lamp. Signal Missing REM REM-9F21 Cargo Compartment Lighting. Faulty Signal. CCM CCM-0021 AirQuality Sensor. Internal Fault. ABS ABS-0094 Communication Between Control modules. Communication Problems With Active On Demand Coupling. CEM CEM-1A64 Communication With AOC Control Module Signal Missing. CEM-1D07 Control Module Internal Fault. CCM-0021, ABS-0094 & CEM-1A64 were already there and the last 2 relate to a faulty DEM so they can be eliminated for now. 2 of those fault codes ECM-A03B & CEM-1D07 seem to point to a faulty CEM. I came out to it today when it was stone cold and it has got worse. The remote wasn't working even with a new battery. I unlocked it with the key, turned the ignition and within a few seconds I would get the same power loss as before but I could start the engine and it would struggle to set off. I'm now unable to scan for any fault codes. I'm now suspecting the CEM has finally given up the ghost. Can anyone shed any light on this? __________________ Current fleet: 2003 XC90 2.4 D5 AWD (PX53 OVZ) 2009 Mercedes-Benz W204 C200 CDI Sport (BJ58 NCV) 1991 Toyota Celica GT (J481 ONB) 1972 Triumph Dolomite 1850 auto (NYE 751L)

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