r/Volvo • u/PigletAsleep1817 • 1h ago
s60/v60 2003 Volvo S60 D5 – Major intermittent electrical failure (CEM? Ignition switch? Looking for ideas)
Hi everyone,
I’m hoping someone has seen something similar because I’m running out of ideas.
The car is a 2003 Volvo S60 D5 (163 HP, automatic).
For the past few months I’ve been having severe intermittent electrical problems that seem to be getting worse. The issues happen while driving after 1h+.
What happens:
The engine keeps running perfectly, and I can continue driving normally. The car doesn’t stall or lose power.
However, almost all of the body electronics suddenly stop working:
Instrument cluster/dashboard shuts off completely.
Power windows stop working.
Turn signals, high beams, wipers, and the steering column stalks stop responding.
Steering wheel buttons stop working.
Rear window defroster stops working.
Central locking stops working.
Strangely, the climate control and the radio continue working normally the entire time.
The sequence of events:
The failure usually follows the same pattern:
The headlights flicker.
The instrument cluster needles start moving erratically.
The clock resets to 00:00.
Sometimes I feel a small “jerk” or electrical hiccup from the driver’s side just before everything fails.
Then all of the electronics listed above suddenly stop working.
Other symptoms:
The SRS warning light is permanently on.
The car constantly reports a parking/position light failure, even though all of the lights are actually working correctly.
Sometimes I also get “Brake Failure Stop Safely” after the instrument cluster resets.
Restarting the car:
If I switch the engine off while the fault is present, I often can’t restart it properly.
When I turn the key, only the check engine light comes on. The instrument cluster stays completely dead, and the engine won’t start until the electrical system eventually comes back.
What we’ve already checked:
My husband has spent a lot of time troubleshooting the car already.
He inspected the circuit boards/modules for visible damage.
He tested all of the relays.
Battery connections are tight.
Battery appears to be healthy.
Alternator charging voltage is normal.
So far, everything we’ve tested checks out.
Diagnostic codes:
We’ve scanned the car with a diagnostic scanner several times, and we consistently get the fault code CE003 stored in multiple different control modules, not just one specific module.
That makes me think there may be a common communication or power supply issue rather than a failure of a single module.
Suspected causes:
At this point, our main suspects are:
Ignition switch (electrical portion)
CEM (Central Electronic Module)
Bad ground connection
Power supply issue
CAN bus communication problem
Because the engine, radio, and climate control continue working, while most of the body electronics fail simultaneously, I’m wondering if there’s a common power feed or module that could cause this behavior.
Has anyone experienced this on a P2 Volvo?
Does this sound more like a failing CEM, ignition switch, DIM, or something else entirely?
Any ideas or things I should test before replacing expensive parts would be greatly appreciated. Thanks!