Intermittent Limp Mode (PRNDS flashing/disappearing) and CAN-Bus communication collap
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Hi, I have a problem with my a4. its happening after few minutes of drive (20minutes)
Symptoms:
thank you
Symptoms:
- PRNDS Display: Randomly starts flashing or disappears entirely from the instrument cluster.
- Instrument Cluster: Gauge needles (RPM, Speedo) bounce or drop, and "Oil Pressure" warning pops up despite sufficient oil levels.
- Trigger: Usually occurs under load (acceleration) or during gear shifts
- Recent Repair: Replacing the Power Supply Relay (Relay 614/J271) stabilized the car for 1.5 days, but the issue returned.
- P1881 – Acceleration Signal missing message.
- 01312, 01314, 01315 – Data Bus drivetrain communication failure (ECM/TCM/ABS).
- P1626, P1648, P1682 – Missing messages from Transmission and ABS modules.
- P1852, P1854 – Implausible messages on the drivetrain bus.
thank you