hali410-Brunei

I'm looking for 2nd opinion since I suspect its the car battery.
Wife's A4 won't crank, blinking at the transmission lights at the instrument cluster.
After some time leaving the ignition on, the blinks disappear and engine able to crank and start. This happens intermittently.

I did diagnosing and got this faults;-

Address 01: Engine
17925 - Power Supply Relay for ECU (J271 or J363): Electrical Malfunction
P1517 - 008 - Implausible Signal - Intermittent

Address 02: Auto Trans
005975 - Supply Voltage: Open Circuit
P1757 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 37
Time Indication: 0

Freeze Frame:
RPM: 96 /min
RPM: 0 /min
(no units): 1.0
Torque: 0.0 Nm
Temperature: 79.0°C
T.B. Angle: 0.0°
Bin. Bits: 0101 0 0

049408 - No Communication with Engine Control Module (SAE:ECM/PCM)
U0100 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 138
Time Indication: 0

Freeze Frame:
RPM: 96 /min
RPM: 0 /min
(no units): 1.0
Torque: 0.0 Nm
Temperature: 79.0°C
T.B. Angle: 0.0°
Bin. Bits: 0101 0 0


Anyone can help?

Nebitan Lik

Did you ever fix the problem? I have the same and no one knows what it is.

xeaudi

Did you ever fix the problem?

Nebitan Lik

Ok, little to late for us, but not to late for new users with this type of errors. If you get errors like "Supply Voltage" combined with "No Communication" in many modules (not just one), and also car isn't starting like it used to, its the BATTERY and you need to change it. The reason for this is that when the battery voltage drop system senses that and turns off some modules in order to start the car, and an error is saved in the specific module.