My 2010 C70 died on me at a traffic light today and won't start: the engine will keep cranking for a while and won't start, then just stops. The oil light is on when cranking. I checked oil and it's normal.


I can scan in real time and see normal fuel pressure (36psi). No code is recorded. Anybody here had similar problem before? Please let me know what may be wrong. Thanks!

 

I have a strong feeling it may be the timing belt. At first I thought that would be a very difficult job. But after checking online, I found the timing belt replacement is surprisingly simple on Volvo cars. So I will open to see if it's broken, then order parts kit (one belt, one pulley, one tensioner). I will let you know how it goes...

 

If the belt broke, the job is a whole lot more complicated and expensive. You have bent valves.

 

My car has less than 110K miles on it and the service/maintenance manual didn't say I have to replace the timing belt (the 2014 manual says you have to replace the timing belt at 120K miles).

So can I hold Volvo responsible for any damage caused by this if they didn't specify? Anybody here had any experience?

 

I've seen many suck things into the timing belt area and cause damage.

 

I just checked and found the timing belt is OK: what a relief!

Now I don't know what can be wrong.

 

I disconnected the battery and reconnected after some minutes to reset everything. Then I found I can start it. But the engine is not running smooth and I can hear some clicking noise (like valve noise). After about a minute, it stops running. Any ideas?

 

Make sure the marks align. It can jump time and bend valves.

Also, that fuel pressure is low, especially if that is absolute pressure.

 

The good part is I did get 3 codes during this short run:

P0016 Crankshaft Position -Camshaft Position Correlation -Bank 1 Sensor A
P0017 Crankshaft Position -Camshaft Position Correlation -Bank 1 Sensor B
P0365 Camshaft Position Sensor B Circuit (Bank 1)

Looks like it's the camshaft position sensor/circuit problem. Anybody here knows where this sensor is and how it looks like?

 

WhyVolvo, what event suggested to you that you may have a timing belt problem? while it is possible to jump a tooth, that's not as common a fault as issues with fuel delivery. Now that you have some codes, you should find the cam shaft position sensor on the front end /top of the engine. You should be able to google and find a youtube vid or some other posts on how to test.

 

Mileage on the car (about 110K); Valve noise during cranking (like pistons knocking on them)...

I think I will replace it anyway this time (otherwise I can't blame Volvo anymore).

This sensor: there is one or two of them?

Thanks!

 

I found the two camshaft position sensors under the plastic engine cover and removed them. The resistance between 1 and 2 lead is 947 Ω on one and 952 Ω on the other. No other conductivity between any other leads found. So I can't tell if they are all broken or all ok. I will remove the crankshaft sensor next...

 

Did you check timing marks? If it jumps time, it will set those codes.

I've been working on Volvos since before the P1 platform existed and I've never had to replace a cam or crank sensor on one. The odds of both yours failing would be pretty slim. I've seen plenty jump time for various reasons.

 

No, I didn't check the marks and I will. I guess I have to remove the vertical section of the belt cover and put the top section back to use that two notches on the top section, right?

I also removed the crankshaft sensor and found it's open between the two leads. Is this normal or this means it's broken?

Thanks!

 

I think I found the problem: the crankshaft sensor is broken (open circuit with infinite resistance). I will order one (the cheapest on a OE part is $54) today and let you know the result.

 

While waiting on the crankshaft sensor, I can't help thinking it's a pretty stupid design to let such a small sensor disable a whole car! I think it should be mandatory to keep a car running without any sensors/computers: those are supposed to be luxury items that will make cars run better. All cars should have a basic drivable mode which doesn't involve any sensor/computer.

Or use redundancy on all critical sensors: it's not hard to use double elements inside those sensors, so both elements have to fail at the same time to disable a car. If this is too expensive for car companies, make them after market choice.

 

It's very common across many manufacturers for the crank sensor to disable fuel or ignition or both. It's partually for emissions, so that isn't changing. Also, if the ECM doesn't know the position of the crankshaft, it can't compute timing for the VVT system.

 

The point is you don't need those systems to drive your car to safety.

 

Tell it to the government. Or buy a 40 year old car with a carb.

 

Or apply a patent and start a company...

I am pretty sure it's already standard on military vehicles.