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Home / DTC / U0294 — Lost communication with the powertrain control module

U0294 — Lost communication with the powertrain control module

Detailed page for trouble code U0294.

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Code

U0294

LAND ROVER U — Network/User

Lost communication with the powertrain control module

Brand: LAND ROVER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • PCM powered down, inoperative, or not programmed
  • Blown fuse or poor power/ground to the PCM
  • Open, shorted, or high-resistance CAN bus wiring (CAN High/Low)
  • Faulty or corroded connectors at PCM or in-line connectors
  • Missing or damaged CAN bus termination resistor(s)
  • Aftermarket accessory or recent repairs disturbed network wiring

Symptoms

  • Inability to communicate with PCM using diagnostic scan tool
  • MIL (Check Engine) or other warning lamps may illuminate
  • Loss of engine-related data on dash (RPM, engine temperature, fault messages)
  • Engine may run poorly, enter limp mode, or not start (depending on other modules)
  • Other modules may report CAN bus errors or multiple U-codes

What to check

  • Confirm U0294 is current or historic and note freeze frame/occurrence conditions
  • Verify battery voltage (12.6 V nominal, >12 V during cranking/diagnostics)
  • Scan for other network U-codes (U0100, U0121, U0155, etc.) to identify affected nodes
  • Visually inspect PCM connector and nearby wiring for damage or corrosion
  • Check fuses and relays supplying PCM power and relevant ignition circuits
  • With key on, backprobe CAN High/Low at a known good point to verify signals

Signal parameters

  • Network: High-speed CAN (powertrain) or vehicle-specific CAN segment — consult OEM wiring diagrams
  • Typical bus speed: commonly 500 kbps for powertrain CAN (vehicle-specific — verify with factory info)
  • Recessive idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant states: CAN_H rises ~3.5 V, CAN_L falls ~1.5 V (standard CAN signaling)
  • Expected: periodic PCM messages at frequencies from a few Hz up to tens/hundreds of Hz depending on signal (engine speed, torque requests, etc.)
  • Termination: two 120 Ω resistors in parallel (≈60 Ω) on HS-CAN — verify with wiring diagram

Diagnostic algorithm

  1. Record DTC(s) and freeze frame data. Check vehicle service information for conditions that set U0294.
  2. Verify battery state-of-charge and charging system. Low voltage can cause modules to drop off the bus.
  3. Use a capable scan tool to attempt direct communication with the PCM. Note whether the PCM responds or is completely absent.
  4. Inspect PCM power and ground circuits: check fuses/relays and measure supply voltage at PCM connector with ignition on.
  5. Visually inspect CAN wiring and connectors from the PCM to the gateway/other modules for damage, corrosion, or loose pins.
  6. Measure CAN bus voltages at a known-good connector with ignition on (no engine required). Compare to expected idle voltages.
  7. Check bus termination resistance between CAN_H and CAN_L (engine off). If termination incorrect, locate and repair short/open.
  8. If messages are missing, use a scope or CAN bus analyzer to view waveform; look for noise, missing frames, or dominant bus errors.
  9. Isolate sections by disconnecting peripherals or harness segments (as allowed by service manual) to locate the open/shorted branch.
  10. If wiring and power/ground are good but no PCM messages, verify PCM software/flash and configuration with OEM tool; reprogram or replace PCM only after confirming hardware fault.
  11. After repair, clear DTCs and road/test to confirm fault does not return and that full communication is restored.

Likely causes

  • Blown/loose fuse or poor ground at the PCM
  • Damaged or disconnected CAN Low/High wiring near PCM or gateway
  • Corroded or poorly-seated PCM connector
  • Faulty PCM hardware
  • Termination resistor open or shorted on the CAN bus

Fault status

⚠️ Status
Lost communication with the powertrain control module (PCM). The PCM is not responding or its CAN messages are not being received by other modules on the vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

U0100 U0101 U0121 U0155 U0401
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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