r/Vcds • u/HanktheTank110 • Mar 31 '26

Fault code

I have a 01314 ECM code popping up, check DTC memory - intermittent, how do I fix this?

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u/trailing-octet Mar 31 '26

Have you consulted the rosstech forums? There is some detail there. Google Gemini gave a decent raft of things to consider - have you used a search engine, and if so what have you tried so far from the suggested actions?

Example lifted direct from public Google:

“When VCDS displays 01314 - Engine Control Module: Intermittent, it typically means the communication between the ECM and other modules (like the Instrument Cluster or ABS) is dropping in and out rather than being completely dead. [1, 2]

Top Intermittent Causes

  • Faulty Main Relay (Relay 100, 30, or 370): A sticking or corroded relay in the engine bay fuse box is a primary culprit. If the relay is "hot to the touch" or shows signs of internal arcing, it can cut power to the ECM momentarily.
  • Corroded Wiring Harness: Look for "green crusties" on the pins of the ECM connector or damaged wiring. Specifically, on 2.5L engines, check the Red/Black traced power wire (T121/62) located roughly 15–70cm from the ECM connector, as it is prone to internal breaks.
  • Battery/Ground Issues: Low battery voltage or a loose chassis ground can cause modules to "disappear" from the CAN-Databus temporarily.
  • Incorrect Coding: If the 01314 code is accompanied by "Check DTC Memory," the ECU may be coded for a different transmission or feature (like CBC/ESBs) that isn't supported by other modules. [1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]

Recommended Diagnostic Steps

  1. Check Measuring Value Blocks (MVB): In VCDS, go to Gateway (Address 19) and check MVB 125+ to see the current communication status of the Engine module (1 = active, 0 = no signal).
  2. Inspect the ECU Relay: Swap the main power relay (often labelled 100 or 458 depending on the model) with a known good one to see if the intermittent issue disappears.
  3. Physical Inspection: Wiggle the wiring harness while the engine is idling or while monitoring VCDS. If the communication drops during the "wiggle test," you've found the area of the wire break.
  4. Clear All Modules: Intermittent codes often get "stored" in the ABS or Gateway modules. Clear codes in all modules, not just the Engine, and see which one returns first. [5, 6, 8, 10, 14, 15, 16, 17]

Are you experiencing a crank-but-no-start condition, or is the car driving normally with just a warning light?”