U18A2 Lost Communication w/ fuel pump driver

MartinLe · 08-25-2022, 01:30 PM

Any of you guys come across this code? "Lost communication with fuel pump driver control module". And the accompanying code P2635, "Fuel pump flow performance". I assume the first triggered the second. But, the P code showed up first in the DTC queue.

I just removed my JMS and installed the DSX low side aux pump.

I had a little fun this morning putting to sleep a newer Corvette that looked like a ZR1 without the wing. Anyhow, I looked down at the dash and I notice the CEL. It did not do this when I logged a couple of runs the other day. I think I hit the rev limiter. I have a bad habit of watching the other car and not my tach. I have hit the limiter before and this has not happened. I cleared the codes and she runs fine.

What do you guys think?

NG329 · 08-25-2022, 02:16 PM

Quote:

Originally Posted by MartinLe

Any of you guys come across this code? "Lost communication with fuel pump driver control module". And the accompanying code P2635, "Fuel pump flow performance". I assume the first triggered the second. But, the P code showed up first in the DTC queue.

I just removed my JMS and installed the DSX low side aux pump.

I had a little fun this morning putting to sleep a newer Corvette that looked like a ZR1 without the wing. Anyhow, I looked down at the dash and I notice the CEL. It did not do this when I logged a couple of runs the other day. I think I hit the rev limiter. I have a bad habit of watching the other car and not my tach. I have hit the limiter before and this has not happened. I cleared the codes and she runs fine.

What do you guys think?

Check your wire harness underneath the coolant reservoir. It's probably touching the headers. I had the same error code amongst others and I haven't gotten it since I repaired those damaged wires.

MartinLe · 08-25-2022, 02:19 PM

Will do. Thanks.

Camaro1973 · 08-25-2022, 04:59 PM

Quote:

Originally Posted by MartinLe

Any of you guys come across this code? "Lost communication with fuel pump driver control module". And the accompanying code P2635, "Fuel pump flow performance". I assume the first triggered the second. But, the P code showed up first in the DTC queue.

I just removed my JMS and installed the DSX low side aux pump.

I had a little fun this morning putting to sleep a newer Corvette that looked like a ZR1 without the wing. Anyhow, I looked down at the dash and I notice the CEL. It did not do this when I logged a couple of runs the other day. I think I hit the rev limiter. I have a bad habit of watching the other car and not my tach. I have hit the limiter before and this has not happened. I cleared the codes and she runs fine.

What do you guys think?

P2635 needs to be set to no light. That will come on because the aux pump is doing most of the work so the in tank pump pressure drops throwing that code.

MartinLe · 08-25-2022, 05:02 PM

Hey Mike,

Do you know how to do that in TP Tuners?

Camaro1973 · 08-25-2022, 06:22 PM

Quote:

Originally Posted by MartinLe

Hey Mike,

Do you know how to do that in TP Tuners?

Yea just set it to no error reported in hp tuners and reflash it.

MartinLe · 08-25-2022, 06:42 PM

So, is the low fuel pressure DTC causing the Loss of communication DTC?

08-25-2022, 01:30 PM	#1
MartinLe Drives: 2017 Chevrolet Camaro ZL1 M6 Join Date: Jul 2020 Location: OR Posts: 479	U18A2 Lost Communication w/ fuel pump driver Any of you guys come across this code? "Lost communication with fuel pump driver control module". And the accompanying code P2635, "Fuel pump flow performance". I assume the first triggered the second. But, the P code showed up first in the DTC queue. I just removed my JMS and installed the DSX low side aux pump. I had a little fun this morning putting to sleep a newer Corvette that looked like a ZR1 without the wing. Anyhow, I looked down at the dash and I notice the CEL. It did not do this when I logged a couple of runs the other day. I think I hit the rev limiter. I have a bad habit of watching the other car and not my tach. I have hit the limiter before and this has not happened. I cleared the codes and she runs fine. What do you guys think? __________________ JRE Terminator Rough Idle Cam Magnuson 2650 - 15% lower, 90mm upper FIC+30% DSX Flex fuel/Low side NW 103mm TB/Roto-Fab CAI Monster S Series Elite E2-X 2" TSP LT's BMR:BK063, BK060,TCA061, UTCA060, UTCA063 Weld Beadlocks/17" NT5R2

08-25-2022, 02:19 PM	#3
MartinLe Drives: 2017 Chevrolet Camaro ZL1 M6 Join Date: Jul 2020 Location: OR Posts: 479	Will do. Thanks. __________________ JRE Terminator Rough Idle Cam Magnuson 2650 - 15% lower, 90mm upper FIC+30% DSX Flex fuel/Low side NW 103mm TB/Roto-Fab CAI Monster S Series Elite E2-X 2" TSP LT's BMR:BK063, BK060,TCA061, UTCA060, UTCA063 Weld Beadlocks/17" NT5R2

08-25-2022, 05:02 PM	#5
MartinLe Drives: 2017 Chevrolet Camaro ZL1 M6 Join Date: Jul 2020 Location: OR Posts: 479	Hey Mike, Do you know how to do that in TP Tuners? __________________ JRE Terminator Rough Idle Cam Magnuson 2650 - 15% lower, 90mm upper FIC+30% DSX Flex fuel/Low side NW 103mm TB/Roto-Fab CAI Monster S Series Elite E2-X 2" TSP LT's BMR:BK063, BK060,TCA061, UTCA060, UTCA063 Weld Beadlocks/17" NT5R2

08-25-2022, 06:42 PM	#7
MartinLe Drives: 2017 Chevrolet Camaro ZL1 M6 Join Date: Jul 2020 Location: OR Posts: 479	So, is the low fuel pressure DTC causing the Loss of communication DTC? __________________ JRE Terminator Rough Idle Cam Magnuson 2650 - 15% lower, 90mm upper FIC+30% DSX Flex fuel/Low side NW 103mm TB/Roto-Fab CAI Monster S Series Elite E2-X 2" TSP LT's BMR:BK063, BK060,TCA061, UTCA060, UTCA063 Weld Beadlocks/17" NT5R2

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