Diagnostic code-2001 S60

MICHAELA BREHM

MEMBER
2001 VOLVO S60
4 CYL
AUTOMATIC
163,000 MILES

Hi, I have a 2001 S60 163,000 miles. Recently the check engine light went on and I had my local guys do a check. The code came back P0422 and another dealership code that I don't remember at the moment.

What does this mean? The car is running great (or so I think), no noises, not running rough, no backfires, not sluggish. Nothing out of the ordinary.

I am on a very tight budget these days (who isn't) and am wondering what this is all about. I took it to a local shop who told me to just drive it for a week to see what happens, that maybe the computer will reset itself after a certain number of times turning on/off the car (is this true, does this happen?) I'm nervous that I may be doing other damage.

Thanks.
Michaela

6 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Is code P422 or P0442? P0422 is not found in our database whereas P0442 is for the EVAP system leaking.

Let me know the other code. Could it be P0455?

If the above codes are correct, it is nothing serious and is not going to harm anything except you would not be able to get the vehicle to pass smog tests.

You can continue to drive the vehicle. It could be caused by an improperly closed fuel filler cap.

If it is intermittent, the light would reset itself after a few times of restarting when problem is not detected by the PCM.

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Thursday, December 16th, 2010 AT 1:50 PM

DOCFIXIT

MECHANIC
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That is leaking in EVAP and fuel system most common cause is fuel filler cap not on tight. If not that then EVAP valve. Blocked tube or fuel pressure sensor faulty. Will not cause running problem or lead to more problems. Should be repaired but not urgent.
Thanks for donate

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Thursday, December 16th, 2010 AT 2:17 PM

MICHAELA BREHM

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Thanks for your quick response! The code the guy wrote down is P0422 I thought he said something about the turbo? The other code was P1237, which they said was a dealer code. Maybe he wrote the code down incorrectly? I have learned that each manufacturer's software needs to be loaded on those gizmos. Maybe they didn't have volvo's?

Would drastic weather change cause this problem? We went from 40's to low teens almost overnight.

When you say fuel filler cap. What do you mean. Gas cap? Or some other cap somewhere else. I recently had the temperature gauge replaced. The check engine light came on about 4 days after this was replaced.

It should be repaired but it's not urgent. It this an expensive repair?

Thank you guys! Merry Christmas!

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Thursday, December 16th, 2010 AT 3:14 PM

KHLOW2008

MECHANIC
41,814 POSTS

Yes fuel filler cap = gas cap.

Repais can range from cheap to quite expensive depending on the extent of the work.

P1237 is not applicable for your model. It means Fuel Pump Secondary circuit malfunction.

Recheck if both codes are correct.

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Thursday, December 16th, 2010 AT 3:29 PM

MICHAELA BREHM

MEMBER
3 POSTS

Hi. Well, the good news is that when I started the car this afternoon the "check engine" light was off. So, I guess the second mechanic I talked to was right. The computer just seemed to reset itself.

I am feeling relieved but should I still be concerned? Why would the engine light come on and just four days later go off? Is it really that simple, that the computer was just out of wack and was able to self-adjust?

For now my bank account is feeling relieved!

Thanks for your help!

Michaela

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Friday, December 17th, 2010 AT 2:23 AM

JIS001

MECHANIC
3,411 POSTS

You should get it diagnosed by either the dealership or a shop familiar with Volvos.

PO422 is for a CAT efficiency.

Diagnostic trouble code (DTC) information

Condition
The control module continuously checks three-way catalytic converter (TWC) efficiency by comparing signals from the rear heated oxygen sensor (HO2S) with the front heated oxygen sensor (HO2S). Diagnostic trouble code (DTC) ECM-4801 will be stored if the efficiency of the three-way catalytic converter (TWC) deviates too much.

Substitute value
Rear heated oxygen sensor (HO2S) control is disabled.

Possible source

misfiring
air leakage in the intake system
air leakage in the exhaust system
faulty fuel pressure
uneven compression
defective three-way catalytic converter (TWC).
Fault symptom[s]

malfunction indicator lamp (MIL) lit.

P1237 is for a flow fault in the turbo.

Diagnostic trouble code (DTC) information

Condition
If engine speed (RPM) is above 3500 rpm and the engine is operating at a high load, the control signal to the turbocharger (TC) control valve is at maximum and the boost pressure (from boost pressure sensor) is lower than a designated value (approximately 20 kPa (2.90 psi) under normal boost pressure - signal too low).
If the air mass (from mass air flow (MAF) sensor) is higher than a desired value (signal too high) it is interpreted as a fault and diagnostic trouble code (DTC) ECM-6806 is stored.

Substitute value
reduced boost pressure

Possible source

Signal too high:

air leakage after turbocharger (TC)
Signal too low:

hoses between turbocharger (TC) and turbocharger (TC) control valve respectively turbocharger (TC) control valve and pressure servo are loose or are blocked/damaged
faulty turbocharger (TC) control valve
faulty boost pressure control (BPC) valve pressure servo
sticking boost pressure control (BPC) valve
Fault symptom[s]

none

I would look for the root cause of both trouble codes to be an intake leak.

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Friday, December 17th, 2010 AT 7:04 AM