2008 V70 2.5T fault code P3388

samiwithvolvo · Post by **samiwithvolvo** » 28 Mar 2020, 09:56

Our 2008 V70 2.5T automatic has lit the engine fault symbol now twice. Both times it has happened on slow speed after several kilometers drive. After resetting the code first time it took about two weeks and maybe 200-300 km drive before appearing again.

The only fault code present is P3388 and I can’t find any explanation with google. The freeze frame has also shown very stange values on both occasions. Examples of freeze frame data:

Speed: 143km/h and 170km/h
Revs: over 6000rpm
Intake air 100C and 123C
Fuel rail pressure 420 kPa and 440kPa

As far as I can tell the car works normally despite the code being active.

Any ideas of what is going on and how to repair?

Post by **RickHaleParker** » 28 Mar 2020, 18:50

P3300 – P3399 Manufacturer Controlled DTC.
P3388 does not translate to any Volvo DTC. A lot of the generic OBD readers do poor translations.
You need a better OBD reader.

samiwithvolvo · Post by **samiwithvolvo** » 29 Mar 2020, 11:35

Thank you for the response. I have used cheap generic elm327 readers with windows, android and ios for about 10 years, and this is the first time I encounter this kind of an issue. But a reader issue definitely would explain why there is absolutely nothing to find with google.

Post by **RickHaleParker** » 29 Mar 2020, 16:02

samiwithvolvo wrote: ↑29 Mar 2020, 11:35 But a reader issue definitely would explain why there is absolutely nothing to find with google.

ELM327 is not an issue. Which program are you currently using?

samiwithvolvo · Post by **samiwithvolvo** » 04 Apr 2020, 13:20

Normally I would use Torque and Obd Auto Doctor Pro from Creosys. But because of the current corona situation I’m 200km away from the car, and the only available reader is ”el cheapo” BLE327 which works currently only with Obd Plus, which is quite poor by the looks of it. Next step will probably be going to a local garage with a proper reader since I can’t get to the car in next few weeks.

samiwithvolvo · Post by **samiwithvolvo** » 06 Apr 2020, 08:18

Got the codes from a professional reader today.

P010121 maf sensor circuit signal low (translation from finnish, not exact)
P218821 fuel system too rich outside idle, low signal (translation from finnish, not exact)

Both codes are classified being intermittent. The garage recommended replacing the maf as first step, does this sound reasonable? Or could this be an issue with the fuel pressure sensor causing the richness, or maybe an air leak somewhere between maf and turbo inlet? The reason for thinking about the fuel pressure sender is the freeze frame data I wrote on the first message.

Post by **RickHaleParker** » 06 Apr 2020, 21:23

samiwithvolvo wrote: ↑06 Apr 2020, 08:18 Got the codes from a professional reader today.

P010121 maf sensor circuit signal low (translation from finnish, not exact)
P218821 fuel system too rich outside idle, low signal (translation from finnish, not exact)

Both codes are classified being intermittent. The garage recommended replacing the maf as first step, does this sound reasonable? Or could this be an issue with the fuel pressure sensor causing the richness, or maybe an air leak somewhere between maf and turbo inlet? The reason for thinking about the fuel pressure sender is the freeze frame data I wrote on the first message.

Truncate the last two digits off each to get the generic code P0101 & P2188. Then translate to Volvo.

P0101 = ECM-1210. P2188 = ECM-216D.

Common possible sources: Air intake leakage & MAF.

-----------------------------------------------------------------------------------

ECM-1210 (P0101) Mass air flow (MAF) sensor. Flow too high

Diagnostic trouble code (DTC) information ECM-1210

Condition
The engine control module (ECM) calculates the expected mass air flow. The calculation is based on a number of different parameters. The calculated value for mass air flow is then compared with the measured value from the mass air flow (MAF) sensor.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the correction factor for the air mass (measured air mass/desired air mass value) is too high, while the long-term fuel trim is above or below a set value.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
Calculated boost pressure
Calculated air mass
Rear heated oxygen sensor (HO2S) control shut off
Misfire diagnostic shut off.

Possible source

Contact resistance or oxidation in the mass air flow (MAF) connectors
Air leakage in the intake system
Blocked intake system
Damaged mass air flow (MAF) sensor.

Fault symptoms
Malfunction indicator lamp (MIL) lit.

------------------------------------------------------------------------------------------------------------------------------

ECM-216D (P2188) Long-term fuel trim, bank 1. Signal too low

Diagnostic trouble code (DTC) information ECM-216D

Condition
The control module receives information from the heated oxygen sensor (HO2S) (bank 1) about the fuel / air mixture when idling and at both the lower and upper part-load range. If the fuel / air mixture deviates from λ=1, the short-term fuel trim will compensate for this by adjusting the injection time so that λ=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. The diagnostic trouble code (DTC) will be stored when the long-term trim must be adjusted almost to maximum in the idle range.

Substitute value
None.

Possible source
Intake air leakage
High fuel pressure
Leaking injectors
Damaged mass air flow (MAF) sensor
Contaminated engine oil
Oil level too high
Damaged heated oxygen sensor (HO2S) (bank 1).

Fault symptoms
None.

samiwithvolvo · Post by **samiwithvolvo** » 10 Apr 2020, 03:04

Thank you, I didn’t know that the codes could be translated that way. I noticed an interesting conflict on the first code. While it says ”flow too high”, but still one possible reason is blocked intake?

I spoke to a local ”Volvo only” garage (not official retailer), and he said that maf failures on gasoline cars are very uncommon. He said, that usually reason for this kind of faults is the boost pressure sensor, or sometimes the fuel pressure sensor. Of course he wanted to get the car connected to vida before saying nothing final. Any thoughts? This is probably the route we are taking, since the car has to pass MOT in next few weeks, and I don’t have enough time to order and replace the sensors one by one until the issue stays away.

Post by **RickHaleParker** » 10 Apr 2020, 04:52

With the engine running. Spray starting fluid around the intake manifold and the intake air pipes. A leak will suck in the starting fluid and you will hear the engine surge. If you find a leak fix it. That might get you ready for the MOT. Better would be to smoke test the intake system for leaks.

samiwithvolvo · Post by **samiwithvolvo** » 03 May 2020, 12:36

This fault seems to remain a mystery for now. After resetting the codes second time on April 6th, the engine fault indicator has stayed off and car works normally. I wonder if a bad batch of fuel could have caused the issue, dunno.