U1308 also U1208
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U1308 also U1208
I get fault U1308 & U1208 regularly. This manifests itself by setting off ABS/ESP fault. When I plug in Lexia I get incoherence error between ECU and ABS ECU. Lexia indicates VIN as VF7**************[VIN obfuscated, can be read by forum staff] but Chassis VIN is VF7**************[VIN obfuscated, can be read by forum staff]. This leads me to think the ECU has been swapped out. I wonder is the fault associated with replacement of ECU? The error tends to happen more frequently at low road speed approx 45kph.....This problem is driving me cracked and I'm getting to the end of my tether with it. Anyone any ideas how I can diagnose this fault?
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Re: U1308 also U1208
The BSI has obviously been swapped. Both those VINs relate to the same vehicle model and engine, so that's a start.
As for the faults, these both relate to the ABS / ESP ECU which A) is not getting any signal from the Engine Management ECU and B) is causing the second fault as a result of fault U1308.
U1308: No communication with the engine management ECU fault : No signal
U1208: No communication with the engine management ECU fault: Data invalid
So basically U1308 is saying the ABS/ESP ECU is not getting any signal from the engine ECU, which results in the second fault U1208, which basically is saying it can't understand the data - which makes sense as it can't if it's not getting anything in the first place.
So the focus needs to be on wiring connections from the ABS / ECU to the Engine ECU - check all connectors. Has any work been done on the brakes lately or any work generally? This won't be the first time we've found people have had work done and dislodged a connector or not put it back properly causing problems down the line.
Of course until this is fixed all your ESP functions will be disabled including hill start and some functions of the electronic parking brake, so be aware.
As for the faults, these both relate to the ABS / ESP ECU which A) is not getting any signal from the Engine Management ECU and B) is causing the second fault as a result of fault U1308.
U1308: No communication with the engine management ECU fault : No signal
U1208: No communication with the engine management ECU fault: Data invalid
So basically U1308 is saying the ABS/ESP ECU is not getting any signal from the engine ECU, which results in the second fault U1208, which basically is saying it can't understand the data - which makes sense as it can't if it's not getting anything in the first place.
So the focus needs to be on wiring connections from the ABS / ECU to the Engine ECU - check all connectors. Has any work been done on the brakes lately or any work generally? This won't be the first time we've found people have had work done and dislodged a connector or not put it back properly causing problems down the line.
Of course until this is fixed all your ESP functions will be disabled including hill start and some functions of the electronic parking brake, so be aware.
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Marc
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Re: U1308 also U1208
Thank you for the detailed response. I assume you mean problem on CAN bus between ECU and ABS ECU? If so only 2 wires to check? This problem is intermittent. The warning light is off at the moment but comes and goes, like I say its strange when the fault does appear I'm doing approx 46kph (taken from lexia)
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Re: U1308 also U1208
Here's the ABS ESP ECU wiring:
Yes, the 9010 (High intersystem 2 CAN bus) and 9011 (Low intersystem 2 CAN bus)
Again, given that you have said it is intermittent, I would really give those connectors a check - but also it is well-known that the state of the C4 Picasso wiring is atrocious - there have been cases where the wiring in the loom has just become brittle and broken causing all sorts of problems.
It can also be an issue of an incorrect / corrupt download to the engine ECU, but I would suspect you would have more errors if that was the case than just these two.
Yes, the 9010 (High intersystem 2 CAN bus) and 9011 (Low intersystem 2 CAN bus)
Again, given that you have said it is intermittent, I would really give those connectors a check - but also it is well-known that the state of the C4 Picasso wiring is atrocious - there have been cases where the wiring in the loom has just become brittle and broken causing all sorts of problems.
It can also be an issue of an incorrect / corrupt download to the engine ECU, but I would suspect you would have more errors if that was the case than just these two.
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Marc
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Re: U1308 also U1208
Check in the engine ECU for any EGR related fault codes. In a genius bit of programming, EGR faults cause loss of comms with the ABS ECU, but don't put the engine management light on!!
Richard W
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Re: U1308 also U1208
Is component 1611 on the diagram the clutch pedal sensor?
Re: U1308 also U1208
What he said^^^
That's what caused it on my Picasso
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1998 Xantia Activa S1
1971 D Special
2006 C3 1.6 HDi SX,
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Re: U1308 also U1208
I don't have any EGR faults logged. I do however have a clutch position sensor fault. I changed the switch and it made no difference and so I'm looking to check wiring continuity to both ABS ECU and engine ECU for consistency. When I drive with cruise control on and press the clutch the car comes out of cruise control so one of the ECUs is getting the correct signal.... Like I said prior its strange that the fault tends to happen when driving at 45/46 kph. Sometimes you can drive the car 200 miles and the ABS light doesn't come on..
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Re: U1308 also U1208
1611: clutch release pedal angle position sensor
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Marc
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Re: U1308 also U1208
I traced clutch position sensor back to ECU and the ABS ECU and all fine. I managed to connect Lexia to the car and I cleared all the faults. I could see in the ABS ECU the position of the clutch position would change when I pressed it down and same with Bosch ECU. Once I do that I cleared all ECU fault codes and I get ECU communications coherence fault straight away and the ABS/Braking system warnings come on. Here is a screen shot of the version and sw version on the ECU. Does anyone know if there is a problem with these versions?
Re: U1308 also U1208
I've also seen this on a picasso I did a bsi swap on. Was everytime the clutch pedal went down it did it. I had to use lexia to recalibrate the sensor iirc. The option isn't in diagbox
2006 C5 HDi 170
1998 Xantia Activa S1
1971 D Special
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1998 Xantia Activa S1
1971 D Special
2006 C3 1.6 HDi SX,
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Re: U1308 also U1208
Here is an overview of the problem.
1) Sometimes I get ABS fault on dash, it tends to always happen at a specific speed - 45kph.
2) I can scan and read using Diagbox Lexia each of the vehicles ECU's. If I use an ELM or other cheaper handheld ECU reader I get no comms error and wont read codes. I think I should be able to read ECU on this car with cheap reader?
3) When I scan using Diagbox, lexia I get red warning lights come on the dash ABS faults auto parking brake etc as its doing the read from the ABS ECU.
4) Clear all faults on all ECU's. If I rescan at this point without driving car, red ABS fault lights come on dash again.
5) Clear all faults on all ECU's. Start car all ok, All is fine then again sometimes when driving at 45kph ABS fault light on.
I think I have 2 faults here. One is some kind of ECU comms issues between ABS ECU and engine ECU. The other is something happens when I drive at 45kph.
1) Sometimes I get ABS fault on dash, it tends to always happen at a specific speed - 45kph.
2) I can scan and read using Diagbox Lexia each of the vehicles ECU's. If I use an ELM or other cheaper handheld ECU reader I get no comms error and wont read codes. I think I should be able to read ECU on this car with cheap reader?
3) When I scan using Diagbox, lexia I get red warning lights come on the dash ABS faults auto parking brake etc as its doing the read from the ABS ECU.
4) Clear all faults on all ECU's. If I rescan at this point without driving car, red ABS fault lights come on dash again.
5) Clear all faults on all ECU's. Start car all ok, All is fine then again sometimes when driving at 45kph ABS fault light on.
I think I have 2 faults here. One is some kind of ECU comms issues between ABS ECU and engine ECU. The other is something happens when I drive at 45kph.
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Re: U1308 also U1208
pauljordanie wrote: ↑13 Mar 2019, 09:48 Here is an overview of the problem.
May be a faulty Speed Sensor on one of the Wheels - but should store a code.1) Sometimes I get ABS fault on dash, it tends to always happen at a specific speed - 45kph.Not necessarily - cheaper readers may not have the necessary protocols to read certain ECUs - that is why a Lexia 3 System is recommended as it is a near dealer-level clone2) I can scan and read using Diagbox Lexia each of the vehicles ECU's. If I use an ELM or other cheaper handheld ECU reader I get no comms error and wont read codes. I think I should be able to read ECU on this car with cheap reader?That is perfectly normal and part of the global diagnostic as the various systems are interrogated.3) When I scan using Diagbox, lexia I get red warning lights come on the dash ABS faults auto parking brake etc as its doing the read from the ABS ECU.See above - normal for these to come on during diagnosis4) Clear all faults on all ECU's. If I rescan at this point without driving car, red ABS fault lights come on dash again.That means there is a fault! Clearing the faults does not make them go away - as soon as the problem arises gain, it will trigger the faults and log a code. You need to see which codes are remaining.5) Clear all faults on all ECU's. Start car all ok, All is fine then again sometimes when driving at 45kph ABS fault light on.That is correct - you have a problem that occurs at speed, that triggers the faults and puts the ESP / ABS system into backup mode. This will keep happening so long as the problem remains.I think I have 2 faults here. One is some kind of ECU comms issues between ABS ECU and engine ECU. The other is something happens when I drive at 45kph.
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Marc
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Re: U1308 also U1208
That sort of speed is about where the Cruise becomes active, so it could well be to do with that threshold. If the BSI has been changed, then maybe it is not programmed correctly for the cruise; or as Chris570 says, the sensor needs to be calibrated. Seems unlikely that you couldn't do this in Diagbox for a modern car, but, hey, this is PSA so anything's possible!!
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