U1310

Code

PEUGEOT U — Network/User

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

Brand: PEUGEOT

Type: U — Network/User

Views: UK: 1 EN: 1 RU: 2

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Page language: EN

Power supply (fuse, relay, battery) to gearbox ECU missing or intermittent
Poor or missing ground at gearbox ECU
Damaged/loose/ corroded connector at gearbox ECU
Open, short or high-resistance CAN bus wiring (CAN High / CAN Low) between gearbox ECU and network
Failed gearbox ECU (internal fault)
Missing or incorrect bus termination (faulty resistor)

Read all stored U- and P-codes from all control modules; note freeze frame and module presence
Check battery voltage and condition; verify ignition voltage to transmission ECU
Inspect fuses and relays for transmission ECU power circuits
Visually inspect transmission ECU connector and wiring for corrosion, bent pins, damage or water ingress
Check for continuity between transmission ECU ground and chassis ground
Use a scan tool to see if the gearbox ECU appears on the network and whether any CAN messages are present

Typical CAN bus: two wires (CAN_H and CAN_L). With ignition ON and bus idle expect CAN_H ≈ 2.5 V and CAN_L ≈ 2.5 V (recessive); when active CAN_H ~3.5 V and CAN_L ~1.5 V on dominant bits
Measure differential voltage (CAN_H minus CAN_L) during activity — expect pulses up to ~2 V differential
Termination resistance between CAN_H and CAN_L (power off) ≈ 60 ohms (two 120 Ω resistors in parallel)
Bus data rate: vehicle-specific (commonly 125, 250, or 500 kb/s for drivetrain networks) — check manufacturer documentation
Module supply voltage: nominal battery voltage (12 V) with ignition on; wake/sleep behavior per vehicle specification

Confirm the code: clear U1310 and perform ignition cycles/road test to see if code returns and under what conditions.
Scan entire network: verify which modules are present and whether transmission ECU responds to diagnostic requests.
Check battery voltage and fuses/relays that feed the transmission ECU; repair any power feed issues.
Inspect connector at transmission ECU for corrosion, water intrusion, bent pins or damaged locking tangs; repair or replace as needed.
Verify ground integrity: measure resistance between ECU ground pins and chassis ground; should be very low (
With ignition ON, measure CAN_H and CAN_L at the transmission ECU connector. If voltages absent or abnormal, trace wiring toward nearest gateway/module.
With power off, measure termination resistance between CAN_H and CAN_L at multiple points to locate open or missing terminator(s).
Use an oscilloscope or CAN bus analyzer to view waveform quality and identify shorted/stuck dominant states or noise on the bus.
Isolate segments: disconnect suspect connectors or modules to determine if a particular harness or module is causing bus fault.
If wiring, connectors and termination check good and bus activity present elsewhere but gearbox ECU still not responding, consider ECU replacement or reflashing per manufacturer procedure.
After repairs, clear codes and perform full network scan and test drive to confirm fault does not return.

Corroded connector or broken pin at transmission ECU
Blown fuse or relay feeding transmission ECU
CAN bus short (CAN_H to battery or CAN_L to ground) near transmission harness
Faulty transmission ECU
Open termination resistor at one end of CAN bus
Intermittent battery voltage (low battery, weak connections) causing ECU not to wake

⚠️ Status

No signal — absence of communication with automatic gearbox electronic control unit (TCU).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-4 hours

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