U1310

Code

DS U — Network/User

Fault: absence of communication with the automatic gearbox electric control ECU: No signal

Brand: DS

Type: U — Network/User

Views: UK: 1 EN: 2 RU: 2

AI status

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Page language: EN

Read all network U-codes and module presence with a full-capability diagnostic scanner (OEM if available)
Check vehicle battery voltage (should be ≥12.4 V, stable during test)
Inspect/verify fuses and relays feeding the TCU and gateway
Visually inspect TCU connector(s) for corrosion, bent pins, water ingress or poor seating
Measure power and ground at TCU connector pins with ignition ON and engine OFF
Measure CAN voltages at TCU connector: CAN_H, CAN_L and differential; check termination resistance (~60 Ω across H-L)

CAN bus idle (recessive) voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines)
CAN dominant state (when active): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (typical values)
Bus termination resistance: ≈ 60 Ω measured between CAN_H and CAN_L (two 120 Ω in parallel)
Presence of expected TCU node ID and periodic CAN message IDs for gearbox (check with OEM data list)
Wake/sleep frames and bus activity during key ON/START

Connect diagnostic scanner and record U1310 and all network-related DTCs and freeze/frame data.
Verify battery voltage and secure battery terminals; retest after charging if low.
Check fuses/relays for TCU power circuit; restore any blown fuses and retest communications.
Visually inspect the transmission ECU connector and wiring harness for damage, corrosion, or water ingress; repair or reseal as required.
With ignition ON (engine off), measure power and ground at the TCU connector pins; confirm correct voltages and good chassis/ECU grounds.
Measure CAN_H and CAN_L voltages at the TCU connector; confirm recessive and dominant levels and check differential voltage.
Measure termination resistance between CAN_H and CAN_L (approx. 60 Ω). If open or low, trace and repair termination or short.
Use an oscilloscope or CAN analyzer to view waveforms and verify valid message traffic and IDs from the TCU and gateway.
If wiring and power/ground are good but no messages: attempt to communicate with the TCU via OEM tool (identify node). If still absent, swap/inspect gateway if evidence points to routing issue.
If TCU is powered but non-responsive and all wiring checks pass, consult service information for reflash/repair or consider replacement of the TCU. Follow manufacturer programming/replacement procedures.
After repairs, clear codes, perform relearns if required, and road-test to verify normal communication and system operation.

Pin corrosion or connector fault at the transmission ECU (common, quick to check)
Power/ground supply missing to the TCU (fuse, relay, wiring)
CAN bus wiring open or short between TCU and gateway/module
Failed TCU (less common than wiring/connector faults)
Gateway/module not forwarding messages (module failure or wake-up issue)

⚠️ Status

U1310 — No communication detected with the automatic gearbox electronic control unit (TCU): no signal received on the vehicle network.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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